{"id":76,"date":"2022-11-22T22:52:11","date_gmt":"2022-11-22T14:52:11","guid":{"rendered":"https:\/\/www.noblerock.cn\/?p=76"},"modified":"2022-11-22T22:52:11","modified_gmt":"2022-11-22T14:52:11","slug":"rock-javascript","status":"publish","type":"post","link":"https:\/\/www.noblerock.cn\/index.php\/2022\/11\/22\/rock-javascript\/","title":{"rendered":"JavaScript"},"content":{"rendered":"<h1 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u524d\u8a00<\/span><\/h1>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8ddf\u7740\u9ed1\u9a6c\u6559\u7a0b\u5b66\u4e60JavaScript\u5185\u5bb9\uff0c\u628a\u8fd9\u4e00\u9636\u6bb5\u7684\u5b66\u4e60\u5185\u5bb9\u6574\u7406\u6210\u7b14\u8bb0\uff0c\u67e5\u6f0f\u8865\u7f3a\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u4e3a\u4e86\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\uff0c\u9009\u7528VScode\u3002<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7ba1\u7406-\u8bbe\u7f6e-\u5e38\u7528\u8bbe\u7f6e-\u5b57\u4f53 Consolas, &#8216;\u5fae\u8f6f\u96c5\u9ed1 Light&#8217;, monospace<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">Chinese \u6c49\u5316Vscode<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">Prettier \u683c\u5f0f\u5316\u4ee3\u7801(\u7f29\u8fdb2\u683c)<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">Auto Rename Tag \u540c\u6b65\u4fee\u6539\u6807\u7b7e<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">HTML CSS SupportHtml\u6587\u6863\u7684CSS\u652f\u6301<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">HTML Snippets \u81ea\u52a8\u8f93\u5165Html\u6807\u7b7e<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">JavaScript (ES6) code snippetsES6\u8bed\u6cd5\u652f\u6301<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">open in browser \u6d4f\u89c8\u5668\u6253\u5f00<\/span><\/p>\n<\/li>\n<\/ul>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u4e00\u3001\u7f16\u7a0b\u57fa\u7840<\/span><\/h2>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u7f16\u7a0b\u57fa\u7840<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u8ba1\u7b97\u673a\u8bed\u8a00<\/span><\/strong><\/span><span class=\"md-plain\">\u5206\u4e3a\u673a\u5668\u8bed\u8a00\uff0c\u6c47\u7f16\u8bed\u8a00\uff0c\u9ad8\u7ea7\u8bed\u8a00\u3002\u8ba1\u7b97\u673a\u5185\u90e8\u6700\u7ec8\u6267\u884c\u7684\u90fd\u662f\u673a\u5668\u8bed\u8a00\uff0c\u7531<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>0<\/code><\/span><span class=\"md-plain\">\u548c<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>1<\/code><\/span><span class=\"md-plain\">\u8fd9\u6837\u7684\u4e8c\u8fdb\u5236\u6570\u6784\u6210\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6570\u636e\u5b58\u50a8\u5355\u4f4d<\/span><\/strong><\/span><span class=\"md-plain\">8bit(\u6bd4\u7279) = 1B(Byte)\u5b57\u8282 \u5343\u5b57\u82821KB = 1024B<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u7ffb\u8bd1\u5668<\/span><\/strong><\/span><span class=\"md-plain\">\u9ad8\u7ea7\u8bed\u8a00\u7f16\u5199\u7684\u7a0b\u5e8f\u4e0d\u80fd\u88ab\u8ba1\u7b97\u673a\u8bc6\u522b\uff0c\u9700\u8981\u7ecf\u8fc7\u8f6c\u6362\uff0c\u5c06\u6e90\u4ee3\u7801\u7a0b\u5e8f\u7ffb\u8bd1\u6210<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u673a\u5668\u8bed\u8a00<\/code><\/span><span class=\"md-plain\">\u624d\u80fd\u8fd0\u884c\u3002\u6d4f\u89c8\u5668\u91cc\u9762\u7684js\u89e3\u91ca\u5668\u5c31\u662f\u8fd9\u6837\u7684\u4e00\u4e2a\u7ffb\u8bd1\u5668\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u7a0b\u5e8f\u8fd0\u884c<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6253\u5f00\u67d0\u4e2a\u7a0b\u5e8f\u65f6\uff0c\u5148\u4ece\u786c\u76d8\u4e2d\u628a\u7a0b\u5e8f\u7684\u4ee3\u7801\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">CPU\u6267\u884c\u5185\u5b58\u4e2d\u7684\u4ee3\u7801<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6ce8\u610f\uff1a\u4e4b\u6240\u4ee5\u8981\u5185\u5b58\u7684\u4e00\u4e2a\u91cd\u8981\u539f\u56e0\uff0c\u662f\u56e0\u4e3a cpu\u8fd0\u884c\u592a\u5feb\u4e86\uff0c\u5982\u679c\u53ea\u4ece\u786c\u76d8\u4e2d\u8bfb\u6570\u636e\uff0c\u4f1a\u6d6a\u8d39cpu\u6027\u80fd\uff0c\u6240\u4ee5\uff0c\u624d\u4f7f\u7528\u5b58\u53d6\u901f\u5ea6\u66f4\u5feb\u7684\u5185\u5b58\u6765\u4fdd\u5b58\u8fd0\u884c\u65f6\u7684\u6570\u636e\u3002\uff08\u5185\u5b58\u662f\u7535\uff0c\u786c\u76d8\u662f\u673a\u68b0\uff09<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u521d\u8bc6JavaScript<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u521b\u59cb\u4eba<\/span><\/strong><\/span><span class=\"md-plain\">\u5e03\u5170\u767b\u00b7\u827e\u5947(Brendan Eich),\u8d77\u521d\u547d\u540d\u4e3a<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>LiveScript<\/code><\/span><span class=\"md-plain\">\u540e\u6765\u4e0eSun\u516c\u53f8\u5408\u4f5c\u6539\u540d\u4e3a<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>JavaScript<\/code><\/span><span class=\"md-plain\">\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">JavaScript<\/span><\/strong><\/span><span class=\"md-plain\">\u8fd0\u884c\u5728\u5ba2\u6237\u7aef\u7684\u811a\u672c\u8bed\u8a00\uff0c\u4e0d\u9700\u8981\u7f16\u8bd1\uff0c\u7531js\u89e3\u91ca\u5668(js\u5f15\u64ce)\u9010\u884c\u89e3\u91ca\u6267\u884c\u3002Node.js\u4e5f\u53ef\u4ee5\u7528\u4e8e\u670d\u52a1\u5668\u7aef\u7f16\u7a0b\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">JavaScript\u7ec4\u6210<\/span><\/strong><\/span><span class=\"md-plain\">ECMAScript(JavaScript\u8bed\u6cd5)\u3001DOM(\u6587\u6863\u5bf9\u8c61\u6a21\u578b)\u3001BOM(\u6d4f\u89c8\u5668\u5bf9\u8c61\u6a21\u578b)<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">JavaScript\u4f5c\u7528<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8868\u5355\u52a8\u6001\u6821\u9a8c(\u5bc6\u7801\u5f3a\u5ea6\u68c0\u6d4b)<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7f51\u9875\u7279\u6548<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u670d\u52a1\u7aef\u5f00\u53d1(Node.js)<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u684c\u9762\u7a0b\u5e8f(Electron)\u3001App(Cordova)\u3001\u63a7\u5236\u786c\u4ef6-\u7269\u8054\u7f51(Ruff)\u3001\u6e38\u620f\u5f00\u53d1(cocos2d-js)<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u300cJavaScript\u4e66\u5199\u4f4d\u7f6e\u300d<\/span><\/strong><\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">JS\u6709\u4e09\u79cd\u4e66\u5199\u65b9\u5f0f\uff0c\u5206\u522b\u662f\u884c\u5185\u3001\u5185\u5d4c\u548c\u5916\u90e8<\/span><\/p>\n<ol class=\"ol-list\" start=\"\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u884c\u5185\u5f0f<\/span><\/p>\n<\/li>\n<\/ol>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"\" spellcheck=\"false\"><span role=\"presentation\">&lt;input type=\"button\" value=\"\u70b9\u6211\u8bd5\u8bd5\" <\/span>\r\n<span role=\"presentation\">onclick=\"alert('Hello World')\" \/&gt;<\/span><\/pre>\n<ol class=\"ol-list\" start=\"\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5185\u5d4c\u5f0f<\/span><\/p>\n<\/li>\n<\/ol>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"\" spellcheck=\"false\"><span role=\"presentation\">&lt;script&gt;<\/span>\r\n<span role=\"presentation\"> \u00a0  alert('Hello  World~!');<\/span>\r\n<span role=\"presentation\">&lt;\/script&gt;<\/span><\/pre>\n<ol class=\"ol-list\" start=\"\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5916\u90e8\u5f0f<\/span><\/p>\n<\/li>\n<\/ol>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"\" spellcheck=\"false\"><span role=\"presentation\">\u5f15\u7528\u5916\u90e8js\u6587\u4ef6<\/span>\r\n<span role=\"presentation\">&lt;script src = \"my.js\"&gt;&lt;\/script&gt;<\/span><\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u300c\u6ce8\u91ca\u300d<\/span><\/strong><\/span><\/p>\n<ol class=\"ol-list\" start=\"\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5355\u884c\u6ce8\u91ca<\/span><\/p>\n<\/li>\n<\/ol>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"\" spellcheck=\"false\"><span role=\"presentation\">\/\/ \u6211\u662f\u5355\u884c\u6ce8\u91ca (\u5feb\u6377\u952e ctrl + \/ )<\/span><\/pre>\n<ol class=\"ol-list\" start=\"\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u591a\u884c\u6ce8\u91ca<\/span><\/p>\n<\/li>\n<\/ol>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"\" spellcheck=\"false\"><span role=\"presentation\">\/*<\/span>\r\n<span role=\"presentation\">  \u83b7\u53d6\u7528\u6237\u5e74\u9f84\u548c\u59d3\u540d<\/span>\r\n<span role=\"presentation\">  \u5e76\u901a\u8fc7\u63d0\u793a\u6846\u663e\u793a\u51fa\u6765<\/span>\r\n<span role=\"presentation\">  \u70b9\u51fbvscode\u5de6\u4e0b\u89d2\u7ba1\u7406-\u952e\u76d8\u5feb\u6377\u65b9\u5f0f-\u5207\u6362\u5757\u6ce8\u91ca<\/span>\r\n<span role=\"presentation\">  (\u9ed8\u8ba4\u5feb\u6377\u952e alt + shift + a) \u4fee\u6539\u4e3a (ctrl + shift + \/)<\/span>\r\n<span role=\"presentation\">*\/<\/span><\/pre>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u4e8c\u3001\u53d8\u91cf<\/span><\/h2>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u53d8\u91cf\u7684\u6982\u5ff5<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u53d8\u91cf<\/span><\/strong><\/span><span class=\"md-plain\">\u662f\u7a0b\u5e8f\u5728\u5185\u5b58\u4e2d\u7533\u8bf7\u7684\u4e00\u5757\u7528\u4e8e\u5b58\u653e\u6570\u636e\u7684\u7a7a\u95f4\u3002\u53d8\u91cf\u662f\u7528\u4e8e\u5b58\u653e\u6570\u636e\u7684\u5bb9\u5668\uff0c\u53ef\u4ee5\u901a\u8fc7\u53d8\u91cf\u540d\u83b7\u53d6\u6570\u636e\uff0c\u751a\u81f3\u4fee\u6539\u6570\u636e\u3002<\/span><\/p>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u53d8\u91cf\u7684\u4f7f\u7528<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">1. \u58f0\u660e\u53d8\u91cf<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"\" spellcheck=\"false\"><span role=\"presentation\">\/\/ 1.\u58f0\u660e\u53d8\u91cf<\/span>\r\n<span role=\"presentation\">var num; \/\/ \u58f0\u660e\u4e00\u4e2a \u540d\u79f0\u4e3a num \u7684\u53d8\u91cf<\/span><\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">var\u662f\u4e00\u4e2aJS\u5173\u952e\u5b57\uff0c\u7528\u6765\u58f0\u660e\u53d8\u91cf(variable\u53d8\u91cf\u7684\u610f\u601d)\u3002num\u662f\u6211\u4eec\u5b9a\u4e49\u7684\u53d8\u91cf\u540d\uff0c\u53ef\u4ee5\u901a\u8fc7\u53d8\u91cf\u540d\u6765\u8bbf\u95ee\u5185\u5b58\u4e2d\u5206\u914d\u7684\u7a7a\u95f4\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">2. \u8d4b\u503c<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"\" spellcheck=\"false\"><span role=\"presentation\">num = 10;\/\/\u7ed9 num \u8fd9\u4e2a\u53d8\u91cf\u8d4b\u503c\u4e3a 10<\/span><\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">3. \u53d8\u91cf\u7684\u521d\u59cb\u5316<\/span><\/strong><\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u58f0\u660e\u4e00\u4e2a\u53d8\u91cf\u5e76\u8d4b\u503c\uff0c \u6211\u4eec\u79f0\u4e4b\u4e3a\u53d8\u91cf\u7684\u521d\u59cb\u5316\u3002<\/span><\/p>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"\" spellcheck=\"false\"><span role=\"presentation\">var num = 10;\/\/\u58f0\u660e\u53d8\u91cf\u5e76\u8d4b\u503c\u4e3a10 <\/span><\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">4. \u53d8\u91cf\u8bed\u6cd5\u6269\u5c55<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">\/\/ 1.\u4e00\u4e2a\u53d8\u91cf\u88ab\u91cd\u65b0\u8d4b\u503c\u540e\uff0c\u5b83\u539f\u6709\u7684\u503c\u4f1a\u88ab\u8986\u76d6\u6389\uff0c\u53d8\u91cf\u503c\u4ee5\u6700\u540e\u4e00\u6b21\u8d4b\u7684\u503c\u4e3a\u51c6\u3002\r\nvar num = 10;\r\nnum = 11;\r\n\/\/ 2.\u540c\u65f6\u58f0\u660e\u591a\u4e2a\u53d8\u91cf(\u53ea\u9700\u8981\u5199\u4e00\u4e2avar,\u591a\u4e2a\u53d8\u91cf\u540d\u4e4b\u95f4\u7528\u82f1\u6587\u9017\u53f7\u9694\u5f00)\r\nvar num = 10, age = 15, name = 'fan';<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u58f0\u660e\u53d8\u91cf\u7279\u6b8a\u60c5\u51b5<\/span><\/p>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u60c5\u51b5<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u7ed3\u679c<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">var age ; console.log (age);<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u53ea\u58f0\u660e \u4e0d\u8d4b\u503c<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">undefined<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">console.log(age)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u4e0d\u58f0\u660e \u4e0d\u8d4b\u503c \u76f4\u63a5\u4f7f\u7528<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u62a5\u9519<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">age = 10; console.log (age);<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u4e0d\u58f0\u660e \u53ea\u8d4b\u503c<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">5. \u53d8\u91cf\u547d\u540d\u89c4\u8303<\/span><\/strong><\/span><\/p>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u4e09\u3001\u6570\u636e\u7c7b\u578b<\/span><\/h2>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5206\u4e3a\u4e24\u7c7b\uff1a\u7b80\u5355\u6570\u636e\u7c7b\u578b(Number,String,Boolean,Undefined,Null)\u548c\u590d\u6742\u6570\u636e\u7c7b\u578b(object)\u3002<\/span><\/p>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u7b80\u5355\u6570\u636e\u7c7b\u578b<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u9ed8\u8ba4\u503c<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Number<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u6570\u5b57\u578b,\u5305\u542b\u6574\u578b\u503c\u548c\u6d6e\u70b9\u578b\u503c<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">0<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">String<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5b57\u7b26\u4e32\u578b<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&#8220;&#8221;<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Boolean<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5e03\u5c14\u503c\u578b<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">false<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Undefined<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">var a;\u58f0\u660e\u4e86\u53d8\u91cfa\u4f46\u662f\u6ca1\u6709\u8d4b\u503c\uff0c\u6b64\u65f6a = undefined<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">undefined<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Null<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">var a = null;\u58f0\u660e\u4e86\u53d8\u91cfa\u4e3a\u7a7a\u503c<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">null<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">Number\u6570\u5b57\u578b<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6570\u5b57\u578b\u8fdb\u5236<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">\/\/ 1.\u5728JS\u4e2d\u516b\u8fdb\u5236\u524d\u9762\u52a00\uff0c\u5341\u516d\u8fdb\u5236\u524d\u9762\u52a0 0x\r\nvar num1 = 07;   \/\/ \u5bf9\u5e94\u5341\u8fdb\u5236\u76847\r\n\/\/ 2.\u5341\u516d\u8fdb\u5236\u6570\u5b57\u5e8f\u5217\u8303\u56f4\uff1a0~9\u4ee5\u53caA~F\r\n var num = 0xA;<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6570\u5b57\u578b\u8303\u56f4<\/span><\/strong><\/span><span class=\"md-plain\">JavaScript\u4e2d\u7684\u6570\u503c\u6709\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6700\u5927\u503c:<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>Number.MAX_VALUE<\/code><\/span><span class=\"md-plain\">\uff0c\u503c\u4e3a\uff1a1.7976931348623157e+308<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6700\u5c0f\u503c:<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>Number.MIN_VALUE<\/code><\/span><span class=\"md-plain\">\uff0c\u503c\u4e3a\uff1a5e-32<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7279\u6b8a\u503c\uff1a<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>Infinity<\/code><\/span><span class=\"md-plain\"> \u65e0\u7a77\u5927 <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>-Infinity<\/code><\/span><span class=\"md-plain\"> \u65e0\u7a77\u5c0f <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>NaN<\/code><\/span><span class=\"md-plain\"> \u4ee3\u8868\u4e00\u4e2a\u975e\u6570\u5b57<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">isNaN():\u7528\u6765\u5224\u65ad\u4e00\u4e2a\u53d8\u91cf\u662f\u5426\u4e3a\u975e\u6570\u5b57\u7684\u7c7b\u578b\u3002\u975e\u6570\u5b57\u578b\u4e3atrue,\u6570\u5b57\u578b\u4e3afalse\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">String\u5b57\u7b26\u4e32\u578b<\/span><\/h3>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">\/\/ 1.\u5b57\u7b26\u4e32\u578b\u53ef\u4ee5\u662f\u5f15\u53f7\u4e2d\u7684\u4efb\u610f\u6587\u672c\uff0c\u8bed\u6cd5\u4e3a \u5355\u5f15\u53f7 \u548c \u53cc\u5f15\u53f7\r\nvar msg = '\u6211\u7684\u540d\u5b57\u53eb';\r\nvar name = \"fan\";<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">1. \u5b57\u7b26\u4e32\u8f6c\u4e49\u7b26<\/span><\/strong><\/span><span class=\"md-plain\">\u90fd\u662f\u4ee5 \\ \u5f00\u5934\uff0c\u8be6\u7ec6\u5982\u4e0b\uff1a<\/span><\/p>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8f6c\u4e49\u7b26<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\\n<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u6362\u884c\u7b26\uff0cn\u662f newline \u7684\u610f\u601d<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\\<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u659c\u6746 \\<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">&#8216;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5355\u5f15\u53f7 \u2018<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">&#8220;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u53cc\u5f15\u53f7 &#8220;<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\\t<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">tab \u7f29\u8fdb<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\\b<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u7a7a\u683c,b\u662f blank \u7684\u610f\u601d<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">2. \u5b57\u7b26\u4e32\u957f\u5ea6<\/span><\/strong><\/span><span class=\"md-plain\"> \u5b57\u7b26\u4e32\u662f\u7531\u82e5\u5e72\u5b57\u7b26\u7ec4\u6210\u7684\uff0c\u8fd9\u4e9b\u5b57\u7b26\u7684\u6570\u91cf\u5c31\u662f\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">\/\/ 1.\u5b57\u7b26\u4e32\u578b\u53ef\u4ee5\u662f\u5f15\u53f7\u4e2d\u7684\u4efb\u610f\u6587\u672c\uff0c\u8bed\u6cd5\u4e3a \u5355\u5f15\u53f7 \u548c \u53cc\u5f15\u53f7\r\nvar msg = '\u6211\u662f\u5e05\u6c14\u7684\u996d\u8001\u677f';\r\nconsole.log(msg.length); \/\/ \u663e\u793a 8<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">3. \u5b57\u7b26\u4e32\u62fc\u63a5<\/span><\/strong><\/span><span class=\"md-plain\"> \u591a\u4e2a\u5b57\u7b26\u4e32\u4e4b\u95f4\u53ef\u4ee5\u4f7f\u7528 + \u8fdb\u884c\u62fc\u63a5\uff0c\u5176\u62fc\u63a5\u65b9\u5f0f\u4e3a \u5b57\u7b26\u4e32 + \u4efb\u4f55\u7c7b\u578b = \u62fc\u63a5\u4e4b\u540e\u7684\u65b0\u5b57\u7b26\u4e32\u3002 \u62fc\u63a5\u524d\u4f1a\u628a\u4e0e\u5b57\u7b26\u4e32\u76f8\u52a0\u7684\u4efb\u4f55\u7c7b\u578b\u8f6c\u6210\u5b57\u7b26\u4e32\uff0c\u518d\u62fc\u63a5\u6210\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">\/\/1.1 \u5b57\u7b26\u4e32 \"\u76f8\u52a0\"\r\nalert('hello' + ' ' + 'world'); \/\/ hello world\r\n\/\/1.2 \u6570\u503c\u5b57\u7b26\u4e32 \"\u76f8\u52a0\"\r\nalert('100' + '100'); \/\/ 100100\r\n\/\/1.3 \u6570\u503c\u5b57\u7b26\u4e32 + \u6570\u503c\r\nalert('11' + 12);     \/\/ 1112 +\u53f7\u53e3\u8bc0\uff1a\u6570\u503c\u76f8\u52a0\uff0c\u5b57\u7b26\u76f8\u8fde\r\n\/\/ 1.4 \u5b57\u7b26\u4e32\u62fc\u63a5\u52a0\u5f3a\r\nvar age = 18;\r\nalert(\"\u996d\u8001\u677f\u4eca\u5e74\" + age +\"\u5c81\u4e86\");<\/pre>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u5e03\u5c14\u578bBoolean<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\"> \u5e03\u5c14\u7c7b\u578b\u6709\u4e24\u4e2a\u503c\uff1atrue \u548c false \uff0c\u5176\u4e2d true \u8868\u793a\u771f\uff08\u5bf9\uff09\uff0c\u800c false \u8868\u793a\u5047\uff08\u9519\uff09\u3002 \u5e03\u5c14\u578b\u548c\u6570\u5b57\u578b\u76f8\u52a0\u7684\u65f6\u5019\uff0c true \u7684\u503c\u4e3a 1 \uff0cfalse \u7684\u503c\u4e3a 0\u3002<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">console.log(true + 1) \/\/ 2\r\nconsole.log(false + 1) \/\/ 1<\/pre>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">Undefined \u548c Null<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\"> \u4e00\u4e2a\u53d8\u91cf\u58f0\u660e\u540e\u6ca1\u6709\u8d4b\u503c\u4f1a\u6709\u4e00\u4e2a\u9ed8\u8ba4\u503cundefined(\u5982\u679c\u76f8\u8fde\u6216\u8005\u76f8\u52a0\u65f6\uff0c\u6ce8\u610f\u7ed3\u679c\ud83d\ude0a)<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  var variable;\r\n  console.log(variable); \/\/ undefined\r\n  console.log(\"\u4f60\u597d\" + variable); \/\/ \u4f60\u597dundefined\r\n  console.log(11 + variable); \/\/ NaN\r\n  console.log(true + variable);\/\/ NaN<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\"> \u4e00\u4e2a\u53d8\u91cf\u58f0\u660e\u5e76\u8d4b\u503cnull,\u91cc\u9762\u5b58\u7684\u503c\u4e3a\u7a7a<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  var var2 = null;\r\n  console.log(var2); \/\/ null\r\n  console.log(\"\u4f60\u597d\" + var2); \/\/ \u4f60\u597dnull\r\n  console.log(11 + var2); \/\/ 11\r\n  console.log(true + var2);\/\/ 1<\/pre>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u83b7\u53d6\u53d8\u91cf\u7c7b\u578b\u53ca\u8f6c\u6362<\/span><\/h3>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u68c0\u6d4b\u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>typeof<\/code><\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  var num = 10;\r\n  console.log(typeof num)\/\/\u7ed3\u679c\u4e3a number<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u5b57\u9762\u91cf<\/code><\/span><span class=\"md-plain\">:\u662f\u6e90\u4ee3\u7801\u4e2d\u4e00\u4e2a\u56fa\u5b9a\u503c\u7684\u8868\u793a\u6cd5\uff0c\u5c31\u662f\u5b57\u9762\u91cf\u5982\u4f55\u53bb\u8868\u8fbe\u8fd9\u4e2a\u503c\u3002\u901a\u8fc7\u6570\u636e\u7684\u683c\u5f0f\u7279\u5f81\u53ef\u4ee5\u5224\u65ad\u6570\u636e\u7684\u7c7b\u578b<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6709\u6570\u5b57\u5b57\u9762\u91cf:8,9,10<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5b57\u7b26\u4e32\u5b57\u9762\u91cf:&#8217;\u996d\u8001\u677f&#8217;\uff0c&#8221;\u524d\u7aef\u5f00\u53d1&#8221;<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5e03\u5c14\u5b57\u9762\u91cf:true,false<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6570\u636e\u7c7b\u578b\u8f6c\u6362<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32<\/span><\/p>\n<\/li>\n<\/ul>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u65b9\u5f0f<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u6848\u4f8b<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">toString()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8f6c\u6210\u5b57\u7b26\u4e32<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">var num=1; alert(num.toString())<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">String()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5f3a\u5236\u8f6c\u6362<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">var num=1; alert(String(num))<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u52a0\u53f7\u62fc\u63a5\u5b57\u7b26\u4e32<\/span><\/strong><\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u548c\u5b57\u7b26\u4e32\u62fc\u63a5\u7684\u7ed3\u679c\u90fd\u662f\u5b57\u7b26\u4e32<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">var num=1; alert(num+&#8217;\u6211\u662f\u5b57\u7b26\u4e32&#8217;)<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8f6c\u6362\u4e3a\u6570\u5b57\u578b<\/span><\/p>\n<\/li>\n<\/ul>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u65b9\u5f0f<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u6848\u4f8b<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">parseInt(String)\u51fd\u6570<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5c06string\u7c7b\u578b\u8f6c\u6210\u6574\u6570\u578b<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">parseInt(&#8217;11&#8217;)<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">parseFloat(String)\u51fd\u6570<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5c06string\u7c7b\u578b\u8f6c\u6210\u6d6e\u70b9\u578b<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">parseFloat(&#8216;11.2&#8217;)<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Number() \u5f3a\u5236\u8f6c\u6362\u51fd\u6570<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5c06string\u7c7b\u578b\u5f3a\u5236\u8f6c\u6362\u4e3a\u6570\u503c\u578b<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">Number(&#8217;12&#8217;)<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">js\u9690\u5f0f\u8f6c\u6362 ( &#8211; <\/span>*<span class=\"md-plain\"> \/)<\/span><\/strong><\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5229\u7528\u7b97\u6570\u8fd0\u7b97\u9690\u5f0f\u8f6c\u6362\u4e3a\u6570\u503c\u578b<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&#8217;12&#8217; &#8211; 0<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8f6c\u6362\u4e3a\u5e03\u5c14\u578b \u4ee3\u8868\u7a7a\u3001\u5426\u5b9a\u7684\u503c\u4f1a\u88ab\u8f6c\u6362\u4e3afalse\uff0c\u5982&#8221;\u30010\u3001NaN\u3001null\u3001undefined \u5176\u4f59\u503c\u90fd\u4f1a\u88ab\u8f6c\u6362\u4e3atrue<\/span><\/p>\n<\/li>\n<\/ul>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u65b9\u5f0f<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u6848\u4f8b<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Boolean()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5176\u4ed6\u7c7b\u578b\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">Boolean(&#8216;true&#8217;)<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u5173\u952e\u5b57\u548c\u4fdd\u7559\u5b57<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6807\u8bc6\u7b26<\/span><\/strong><\/span><span class=\"md-plain\">\u6307\u5f00\u53d1\u4eba\u5458\u4e3a\u53d8\u91cf\u3001\u5c5e\u6027\u3001\u51fd\u6570\u3001\u53c2\u6570\u53d6\u5f97\u540d\u5b57\u3002\u6807\u8bc6\u7b26\u4e0d\u80fd\u662f\u5173\u952e\u5b57\u6216\u4fdd\u7559\u5b57\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5173\u952e\u5b57<\/span><\/strong><\/span><span class=\"md-plain\">\u6307 JS\u672c\u8eab\u5df2\u7ecf\u4f7f\u7528\u4e86\u7684\u5b57\uff0c\u4e0d\u80fd\u518d\u7528\u5b83\u4eec\u5145\u5f53\u53d8\u91cf\u540d\u3001\u65b9\u6cd5\u540d<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5305\u62ec\uff1a<\/span><\/strong><\/span><span class=\"md-plain\">break\u3001case\u3001catch\u3001continue\u3001default\u3001delete\u3001do\u3001else\u3001finally\u3001for\u3001function\u3001if\u3001in\u3001instanceof\u3001new\u3001return\u3001switch\u3001this\u3001throw\u3001try\u3001typeof\u3001var\u3001void\u3001while\u3001with \u7b49\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u4fdd\u7559\u5b57<\/span><\/strong><\/span><span class=\"md-plain\">\u5b9e\u9645\u4e0a\u5c31\u662f\u9884\u7559\u7684\u201c\u5173\u952e\u5b57\u201d\uff0c\u610f\u601d\u662f\u73b0\u5728\u867d\u7136\u8fd8\u4e0d\u662f\u5173\u952e\u5b57\uff0c\u4f46\u662f\u672a\u6765\u53ef\u80fd\u4f1a\u6210\u4e3a\u5173\u952e\u5b57\uff0c\u540c\u6837\u4e0d\u80fd\u4f7f\u7528\u5b83\u4eec\u5f53\u53d8\u91cf\u540d\u6216\u65b9\u6cd5\u540d\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5305\u62ec\uff1a<\/span><\/strong><\/span><span class=\"md-plain\">boolean\u3001byte\u3001char\u3001class\u3001const\u3001debugger\u3001double\u3001enum\u3001export\u3001extends\u3001fimal\u3001float\u3001goto\u3001implements\u3001import\u3001int\u3001interface\u3001long\u3001mative\u3001package\u3001private\u3001protected\u3001public\u3001short\u3001static\u3001super\u3001synchronized\u3001throws\u3001transient\u3001volatile \u7b49\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6ce8\u610f\uff1a<\/span><\/strong><\/span><span class=\"md-plain\">\u5982\u679c\u5c06\u4fdd\u7559\u5b57\u7528\u4f5c\u53d8\u91cf\u540d\u6216\u51fd\u6570\u540d\uff0c\u90a3\u4e48\u9664\u975e\u5c06\u6765\u7684\u6d4f\u89c8\u5668\u5b9e\u73b0\u4e86\u8be5\u4fdd\u7559\u5b57\uff0c\u5426\u5219\u5f88\u53ef\u80fd\u6536\u4e0d\u5230\u4efb\u4f55\u9519\u8bef\u6d88\u606f\u3002\u5f53\u6d4f\u89c8\u5668\u5c06\u5176\u5b9e\u73b0\u540e\uff0c\u8be5\u5355\u8bcd\u5c06\u88ab\u770b\u505a\u5173\u952e\u5b57\uff0c\u5982\u6b64\u5c06\u51fa\u73b0\u5173\u952e\u5b57\u9519\u8bef\u3002<\/span><\/p>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u56db\u3001\u8fd0\u7b97\u7b26\u4e0e\u6d41\u7a0b\u63a7\u5236<\/span><\/h2>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u8fd0\u7b97\u7b26(\u64cd\u4f5c\u7b26)<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u8fd0\u7b97\u7b26<\/span><\/strong><\/span><span class=\"md-plain\">\u662f\u7528\u4e8e\u5b9e\u73b0\u8d4b\u503c\u3001\u6bd4\u8f83\u548c\u6267\u884c\u7b97\u6570\u8fd0\u7b97\u7b49\u529f\u80fd\u7684\u7b26\u53f7\u3002\u5e38\u7528\u8fd0\u7b97\u7b26\u5206\u7c7b\u5982\u4e0b\ud83d\udc47<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7b97\u6570\u8fd0\u7b97\u7b26<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u9012\u589e\u548c\u9012\u51cf\u8fd0\u7b97\u7b26<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u903b\u8f91\u8fd0\u7b97\u7b26<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8d4b\u503c\u8fd0\u7b97\u7b26<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u7b97\u6570\u8fd0\u7b97\u7b26<\/span><\/strong><\/span><\/p>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8fd0\u7b97\u7b26<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u63cf\u8ff0<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u6848\u4f8b<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">+<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u52a0<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10+20=30<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">&#8211;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u51cf<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10-20=-10<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">*<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u4e58<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10*20=200<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\/<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u9664<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">10\/20=0.5<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">%<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u53d6\u4f59(\u53d6\u6a21)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8fd4\u56de\u9664\u6cd5\u7684\u4f59\u65709%2=1<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6d6e\u70b9\u6570\u7684\u7cbe\u5ea6\u95ee\u9898<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  var result = 0.1 + 0.2;    \/\/ \u7ed3\u679c\u4e0d\u662f 0.3\uff0c\u800c\u662f\uff1a0.30000000000000004\r\n  console.log(0.07 * 100);   \/\/ \u7ed3\u679c\u4e0d\u662f 7\uff0c  \u800c\u662f\uff1a7.000000000000001<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6d6e\u70b9\u6570\u503c\u7684\u6700\u9ad8\u7cbe\u5ea6\u662f17\u4f4d\u5c0f\u6570\uff0c\u4f46\u662f\u5728\u8fdb\u884c\u7b97\u6570\u8fd0\u7b97\u65f6\u5176\u7cbe\u786e\u5ea6\u8fdc\u8fdc\u4e0d\u5982\u6574\u6570,\u6240\u4ee5\u4e0d\u8981\u76f4\u63a5\u5224\u65ad\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49!<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8868\u8fbe\u5f0f\u4e0e\u8fd4\u56de\u503c<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8868\u8fbe\u5f0f\uff1a\u7531\u6570\u5b57\u3001\u8fd0\u7b97\u7b26\u548c\u53d8\u91cf\u7ec4\u6210\u7684\u5f0f\u5b50\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8fd4\u56de\u503c\uff1a\u6bcf\u4e00\u4e2a\u8868\u8fbe\u5f0f\u7ecf\u8fc7\u76f8\u5e94\u7684\u8fd0\u7b97\u4e4b\u540e\uff0c\u4f1a\u6709\u4e00\u4e2a\u6700\u7ec8\u7ed3\u679c\uff0c\u79f0\u4e3a\u8868\u8fbe\u5f0f\u7684\u8fd4\u56de\u503c<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u9012\u589e\u548c\u9012\u51cf\u8fd0\u7b97\u7b26<\/span><\/strong><\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\"> \u9012\u589e\u548c\u9012\u51cf\u8fd0\u7b97\u7b26\u5fc5\u987b\u914d\u5408\u53d8\u91cf\u4f7f\u7528\u3002<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u9012\u589e\u8fd0\u7b97\u7b26<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  var  num = 10;\r\n  alert(++num + 10);   \/\/ 21 \u4f7f\u7528\u53e3\u8bc0\uff1a\u5148\u81ea\u52a0\uff0c\u540e\u8fd4\u56de\u503c\r\n  \r\n  var  num1 = 10;\r\n  alert(10 + num1++);  \/\/ 20 \u4f7f\u7528\u53e3\u8bc0\uff1a\u5148\u8fd4\u56de\u539f\u503c\uff0c\u540e\u81ea\u52a0 \r\n  var num = 1;\r\n  var num2 = ++num + num++; \/\/num = 2\r\n  console.log(num2);\/\/4\r\n  \r\n  var num = 1;\r\n  var num1 = 1;\r\n  var num2 = num++ + num1++; \/\/ 1 + 1\r\n  console.log(num2);\/\/2\r\n  \r\n  var num = 1;\r\n  var num2 = num++ + num++;\/\/ 1 + 2 \r\n  console.log(num2); \/\/ 3<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/span><\/strong><\/span><\/p>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8fd0\u7b97\u7b26<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u63cf\u8ff0<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u6848\u4f8b<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u7ed3\u679c<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">&lt;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5c0f\u4e8e\u53f7<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">1&lt;2<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">true<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">&gt;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5927\u4e8e\u53f7<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">1&gt;2<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">false<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">&gt;=<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5927\u4e8e\u7b49\u4e8e\u53f7(\u5927\u4e8e\u6216\u8005\u7b49\u4e8e)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">2 &gt;= 2<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">true<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">&lt;=<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5c0f\u4e8e\u7b49\u4e8e\u53f7(\u5c0f\u4e8e\u6216\u8005\u7b49\u4e8e)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">3 &lt;= 2<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">false<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">==<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5224\u7b49\u53f7(\u4f1a\u8f6c\u578b)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">15 == &#8217;15&#8217;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">true<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">!=<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u4e0d\u7b49\u53f7<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">37 != 37<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">false<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">=== !===<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5168\u7b49 \u5168\u4e0d\u7b49(\u8981\u6c42\u503c\u548c\u6570\u636e\u7c7b\u578b\u90fd\u4e00\u81f4)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">37 === &#8217;37&#8217;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">false<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u903b\u8f91\u8fd0\u7b97\u7b26<\/span><\/strong><\/span><span class=\"md-plain\"> \u903b\u8f91\u8fd0\u7b97\u7b26\u662f\u7528\u6765\u8fdb\u884c\u5e03\u5c14\u503c\u8fd0\u7b97\u7684\u8fd0\u7b97\u7b26 \u77ed\u8def\u8fd0\u7b97:\u5f53\u6709\u591a\u4e2a\u8868\u8fbe\u5f0f\uff08\u503c\uff09\u65f6,\u5de6\u8fb9\u7684\u8868\u8fbe\u5f0f\u503c\u53ef\u4ee5\u786e\u5b9a\u7ed3\u679c\u65f6,\u5c31\u4e0d\u518d\u7ee7\u7eed\u8fd0\u7b97\u53f3\u8fb9\u7684\u8868\u8fbe\u5f0f\u7684\u503c;<\/span><\/p>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8fd0\u7b97\u7b26<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u63cf\u8ff0<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u6848\u4f8b<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u7279\u70b9<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">&amp;&amp;<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&#8220;\u903b\u8f91\u4e0e&#8221;,\u7b80\u79f0&#8221;\u4e0e&#8221; and<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">true &amp;&amp; false<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u4e24\u8fb9\u90fd\u662f true\u624d\u8fd4\u56de true<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\">||<\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&#8220;\u903b\u8f91\u6216&#8221;,\u7b80\u79f0&#8221;\u6216&#8221; or<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">true<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u6709\u771f\u4e3a\u771f<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">!<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&#8220;\u903b\u8f91\u975e&#8221;,\u7b80\u79f0&#8221;\u975e&#8221; not<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">!true<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u53d6\u53cd<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u8d4b\u503c\u8fd0\u7b97\u7b26<\/span><\/strong><\/span><\/p>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8fd0\u7b97\u7b26<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u63cf\u8ff0<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u6848\u4f8b<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">=<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u76f4\u63a5\u8d4b\u503c<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">var userName = &#8216;fan&#8217;<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">+= -=<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u52a0\u51cf\u4e00\u4e2a\u6570\u540e\u518d\u8d4b\u503c<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">var age=5; age+=5<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">*= \/= %=<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u4e58\u3001\u9664\u3001\u53d6\u6a21\u540e\u518d\u8d4b\u503c<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">var age=5; age*=5<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u8fd0\u7b97\u7b26\u4f18\u5148\u7ea7<\/span><\/strong><\/span><\/p>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u4f18\u5148\u7ea7<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8fd0\u7b97\u7b26<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u987a\u5e8f<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">1<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5c0f\u62ec\u53f7<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">()<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">2<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u4e00\u5143\u8fd0\u7b97\u7b26<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">! ++ &#8212;<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">3<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u7b97\u6570\u8fd0\u7b97\u7b26<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5148* \/ % \u540e+ &#8211;<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">4<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5173\u7cfb\u8fd0\u7b97\u7b26<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">&gt; &gt;= &lt; &lt;=<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">5<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u76f8\u7b49\u8fd0\u7b97\u7b26<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">== != === !==<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">6<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u903b\u8f91\u8fd0\u7b97\u7b26<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5148&amp;&amp; \u540e<\/span>||<\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">7<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8d4b\u503c\u8fd0\u7b97\u7b26<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">=<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">8<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u9017\u53f7\u8fd0\u7b97\u7b26<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">,<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u6d41\u7a0b\u63a7\u5236<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6d41\u7a0b\u63a7\u5236<\/span><\/strong><\/span><span class=\"md-plain\">\u5728\u4e00\u4e2a\u7a0b\u5e8f\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5404\u6761\u4ee3\u7801\u7684\u6267\u884c\u987a\u5e8f\u5bf9\u7a0b\u5e8f\u7684\u7ed3\u679c\u662f\u6709\u76f4\u63a5\u5f71\u54cd\u7684\u3002\u5f88\u591a\u65f6\u5019\u6211\u4eec\u8981\u901a\u8fc7\u63a7\u5236\u4ee3\u7801\u7684\u6267\u884c\u987a\u5e8f\u6765\u5b9e\u73b0\u6211\u4eec\u8981\u5b8c\u6210\u7684\u529f\u80fd\u3002\u6d41\u7a0b\u63a7\u5236\u4e3b\u8981\u6709\u4e09\u79cd\u7ed3\u6784\uff0c\u5206\u522b\u662f<\/span><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u987a\u5e8f\u7ed3\u6784<\/span><\/strong><\/span><span class=\"md-plain\">\u3001<\/span><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5206\u652f\u7ed3\u6784<\/span><\/strong><\/span><span class=\"md-plain\">\u548c<\/span><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5faa\u73af\u7ed3\u6784<\/span><\/strong><\/span><span class=\"md-plain\">\uff0c\u4ee3\u8868\u4e09\u79cd\u4ee3\u7801\u6267\u884c\u7684\u987a\u5e8f\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5206\u652f\u6d41\u7a0b\u63a7\u5236<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/ 1. \u6761\u4ef6\u6210\u7acb\u6267\u884c\u7684\u4ee3\u7801\u8bed\u53e5\r\n  if (\u6761\u4ef6\u8868\u8fbe\u5f0f) { \r\n  }\r\n  \r\n  \/\/ 2.if else \u8bed\u53e5\r\n  if (\u6761\u4ef6\u8868\u8fbe\u5f0f) {\r\n      \/\/ [\u5982\u679c] \u6761\u4ef6\u6210\u7acb\u6267\u884c\u7684\u4ee3\u7801\r\n  } else {\r\n      \/\/ [\u5426\u5219] \u6267\u884c\u7684\u4ee3\u7801\r\n  }\r\n  \r\n  \/\/ 3. if else if \u8bed\u53e5(\u591a\u5206\u652f\u8bed\u53e5)\r\n  \/\/ \u9002\u5408\u4e8e\u68c0\u67e5\u591a\u91cd\u6761\u4ef6\u3002\r\n  if (\u6761\u4ef6\u8868\u8fbe\u5f0f1) {\r\n      \u8bed\u53e51\uff1b\r\n  } else if (\u6761\u4ef6\u8868\u8fbe\u5f0f2)  {\r\n      \u8bed\u53e52\uff1b\r\n  } else if (\u6761\u4ef6\u8868\u8fbe\u5f0f3)  {\r\n     \u8bed\u53e53\uff1b\r\n   ....\r\n  } else {\r\n    \/\/ \u4e0a\u8ff0\u6761\u4ef6\u90fd\u4e0d\u6210\u7acb\u6267\u884c\u6b64\u5904\u4ee3\u7801\r\n}<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u4e09\u5143\u8868\u8fbe\u5f0f<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/\u5982\u679c\u8868\u8fbe\u5f0f1\u4e3a true \uff0c\u5219\u8fd4\u56de\u8868\u8fbe\u5f0f2\u7684\u503c\uff0c\u5982\u679c\u8868\u8fbe\u5f0f1\u4e3a false\uff0c\u5219\u8fd4\u56de\u8868\u8fbe\u5f0f3\u7684\u503c\r\n  \u8868\u8fbe\u5f0f1 ? \u8868\u8fbe\u5f0f2 : \u8868\u8fbe\u5f0f3;<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">switch\u5206\u652f\u6d41\u7a0b\u63a7\u5236<\/span><\/strong><\/span><span class=\"md-plain\">\u5b83\u7528\u4e8e\u57fa\u4e8e\u4e0d\u540c\u7684\u6761\u4ef6\u6765\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u3002\u5f53\u8981\u9488\u5bf9\u53d8\u91cf\u8bbe\u7f6e\u4e00\u7cfb\u5217\u7684\u7279\u5b9a\u503c\u7684\u9009\u9879\u65f6\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528 switch\u3002<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  switch( \u8868\u8fbe\u5f0f ){ \r\n      case value1:\r\n          \/\/ \u8868\u8fbe\u5f0f \u7b49\u4e8e value1 \u65f6\u8981\u6267\u884c\u7684\u4ee3\u7801\r\n          break;\r\n      case value2:\r\n          \/\/ \u8868\u8fbe\u5f0f \u7b49\u4e8e value2 \u65f6\u8981\u6267\u884c\u7684\u4ee3\u7801\r\n          break;\r\n      default:\r\n          \/\/ \u8868\u8fbe\u5f0f \u4e0d\u7b49\u4e8e\u4efb\u4f55\u4e00\u4e2a value \u65f6\u8981\u6267\u884c\u7684\u4ee3\u7801\r\n  }<\/pre>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u4e94\u3001\u5faa\u73af\u4e0e\u4ee3\u7801\u89c4\u8303<\/span><\/h2>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u5faa\u73af<\/span><\/h3>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8fd0\u7b97\u7b26<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u63cf\u8ff0<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\u521d\u59cb\u5316\u53d8\u91cf<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u901a\u5e38\u88ab\u7528\u4e8e\u521d\u59cb\u5316\u4e00\u4e2a\u8ba1\u6570\u5668,\u8be5\u8868\u8fbe\u5f0f\u53ef\u4ee5\u4f7f\u7528var\u5173\u952e\u5b57\u58f0\u660e\u65b0\u7684\u53d8\u91cf\uff0c\u8fd9\u4e2a\u53d8\u91cf\u5e2e\u6211\u4eec\u6765\u8bb0\u5f55\u6b21\u6570\u3002<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\u6761\u4ef6\u8868\u8fbe\u5f0f<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u7528\u4e8e\u786e\u5b9a\u6bcf\u4e00\u6b21\u5faa\u73af\u662f\u5426\u80fd\u88ab\u6267\u884c\uff0c\u5982\u679c\u7ed3\u679c\u662ftrue\u5c31\u7ee7\u7eed\u5faa\u73af\uff0c\u5426\u5219\u9000\u51fa\u5faa\u73af<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\u64cd\u4f5c\u8868\u8fbe\u5f0f<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u6bcf\u6b21\u5faa\u73af\u7684\u6700\u540e\u90fd\u8981\u6267\u884c\u7684\u8868\u8fbe\u5f0f\u3002\u901a\u5e38\u7528\u4e8e\u66f4\u65b0\u8ba1\u6570\u5668\u53d8\u91cf\u7684\u503c<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  for(\u521d\u59cb\u5316\u53d8\u91cf; \u6761\u4ef6\u8868\u8fbe\u5f0f; \u64cd\u4f5c\u8868\u8fbe\u5f0f ){\r\n    \/\/\u5faa\u73af\u4f53\r\n}<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6267\u884c\u6d41\u7a0b<\/span><\/strong><\/span><\/p>\n<ol class=\"ol-list\" start=\"\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u521d\u59cb\u5316\u53d8\u91cf\uff0c\u521d\u59cb\u5316\u64cd\u4f5c\u5728\u6574\u4e2a for \u5faa\u73af\u53ea\u4f1a\u6267\u884c\u4e00\u6b21\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6267\u884c\u6761\u4ef6\u8868\u8fbe\u5f0f\uff0c\u5982\u679c\u4e3atrue\uff0c\u5219\u6267\u884c\u5faa\u73af\u4f53\u8bed\u53e5\uff0c\u5426\u5219\u9000\u51fa\u5faa\u73af\uff0c\u5faa\u73af\u7ed3\u675f\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6267\u884c\u64cd\u4f5c\u8868\u8fbe\u5f0f,\u6b64\u65f6\u7b2c\u4e00\u8f6e\u7ed3\u675f\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7b2c\u4e8c\u8f6e\u5f00\u59cb\uff0c\u76f4\u63a5\u53bb\u6267\u884c\u6761\u4ef6\u8868\u8fbe\u5f0f\uff08\u4e0d\u518d\u521d\u59cb\u5316\u53d8\u91cf\uff09\uff0c\u5982\u679c\u4e3a true \uff0c\u5219\u53bb\u6267\u884c\u5faa\u73af\u4f53\u8bed\u53e5\uff0c\u5426\u5219\u9000\u51fa\u5faa\u73af\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7ee7\u7eed\u6267\u884c\u64cd\u4f5c\u8868\u8fbe\u5f0f\uff0c\u7b2c\u4e8c\u8f6e\u7ed3\u675f\u3002&#8230;&#8230;<\/span><\/p>\n<\/li>\n<\/ol>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u53cc\u91cdfor\u5faa\u73af<\/span><\/strong><\/span><span class=\"md-plain\">\u5faa\u73af\u5d4c\u5957\u662f\u6307\u5728\u4e00\u4e2a\u5faa\u73af\u8bed\u53e5\u4e2d\u518d\u5b9a\u4e49\u4e00\u4e2a\u5faa\u73af\u8bed\u53e5\u7684\u8bed\u6cd5\u7ed3\u6784\uff0c\u4f8b\u5982\u5728for\u5faa\u73af\u8bed\u53e5\u4e2d\uff0c\u53ef\u4ee5\u518d\u5d4c\u5957\u4e00\u4e2afor \u5faa\u73af\uff0c\u8fd9\u6837\u7684 for \u5faa\u73af\u8bed\u53e5\u6211\u4eec\u79f0\u4e4b\u4e3a\u53cc\u91cdfor\u5faa\u73af\u3002<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  for (\u5916\u5faa\u73af\u7684\u521d\u59cb; \u5916\u5faa\u73af\u7684\u6761\u4ef6; \u5916\u5faa\u73af\u7684\u64cd\u4f5c\u8868\u8fbe\u5f0f) {\r\n    for (\u5185\u5faa\u73af\u7684\u521d\u59cb; \u5185\u5faa\u73af\u7684\u6761\u4ef6; \u5185\u5faa\u73af\u7684\u64cd\u4f5c\u8868\u8fbe\u5f0f) {  \r\n       \u9700\u6267\u884c\u7684\u4ee3\u7801;\r\n   }\r\n}\r\n\/\/for\u5faa\u73af\u6253\u5370\u4e5d\u4e5d\u4e58\u6cd5\u8868\r\n  var str = \"\";\r\n  for (var i = 1; i &lt;= 9; i++) {\r\n    for (var j = 1; j &lt;= i; j++) {\r\n      str += j + \"x\" + i + \"=\" + j * i + \"\\t\";\r\n    }\r\n    str += \"\\n\";\r\n  }\r\n  console.log(str);<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">while\u5faa\u73af<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  while (\u6761\u4ef6\u8868\u8fbe\u5f0f) {\r\n      \/\/ \u5faa\u73af\u4f53\u4ee3\u7801 \r\n  }\r\n  \/\/ 1. \u5148\u6267\u884c\u6761\u4ef6\u8868\u8fbe\u5f0f\uff0c\u5982\u679c\u7ed3\u679c\u4e3a true\uff0c\u5219\u6267\u884c\u5faa\u73af\u4f53\u4ee3\u7801\uff1b\r\n  \/\/    \u5982\u679c\u4e3a false\uff0c\u5219\u9000\u51fa\u5faa\u73af\uff0c\u6267\u884c\u540e\u9762\u4ee3\u7801\r\n  \/\/ 2. \u6267\u884c\u5faa\u73af\u4f53\u4ee3\u7801\r\n  \/\/ 3.  \u5faa\u73af\u4f53\u4ee3\u7801\u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u7a0b\u5e8f\u4f1a\u7ee7\u7eed\u5224\u65ad\u6267\u884c\u6761\u4ef6\u8868\u8fbe\u5f0f\uff0c\r\n  \/\/\u8ba1\u7b971-100\u7684\u7d2f\u52a0\u548c\r\n    var i = 1;\r\n    var sum = 0;\r\n    while (i &lt;= 100) {\r\n      sum += i;\r\n      i++;\r\n    }\r\n    console.log(sum);<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">do-while\u5faa\u73af<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">do {\r\n    \/\/ \u5faa\u73af\u4f53\u4ee3\u7801 - \u6761\u4ef6\u8868\u8fbe\u5f0f\u4e3a true \u65f6\u91cd\u590d\u6267\u884c\u5faa\u73af\u4f53\u4ee3\u7801\r\n} while(\u6761\u4ef6\u8868\u8fbe\u5f0f);\r\n    \/\/ \u5148\u6267\u884c\u4e00\u6b21\u5faa\u73af\u4f53\u4ee3\u7801\uff0c\u518d\u6267\u884c\u6761\u4ef6\u8868\u8fbe\u5f0f\r\n    \/\/\u8ba1\u7b97100\u4ee5\u5185\u7684\u5076\u6570\u7d2f\u52a0\u548c\r\n      var i = 1;\r\n      var sum = 0;\r\n      do {\r\n        if (i % 2 == 0) {\r\n          sum += i;\r\n        }\r\n        i++;\r\n      } while (i &lt;= 100);\r\n      console.log(sum);<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">continue\u3001break<\/span><\/strong><\/span> <span class=\"md-pair-s\" spellcheck=\"false\"><code>continue<\/code><\/span><span class=\"md-plain\"> \u5173\u952e\u5b57\u7528\u4e8e\u7acb\u5373\u8df3\u51fa\u672c\u6b21\u5faa\u73af\uff0c\u7ee7\u7eed\u4e0b\u4e00\u6b21\u5faa\u73af\uff08\u672c\u6b21\u5faa\u73af\u4f53\u4e2d continue \u4e4b\u540e\u7684\u4ee3\u7801\u5c31\u4f1a\u5c11\u6267\u884c\u4e00\u6b21\uff09\u3002 <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>break<\/code><\/span><span class=\"md-plain\"> \u5173\u952e\u5b57\u7528\u4e8e\u7acb\u5373\u8df3\u51fa\u6574\u4e2a\u5faa\u73af\uff08\u5faa\u73af\u7ed3\u675f\uff09\u3002<\/span><\/p>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u4ee3\u7801\u89c4\u8303<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">1.\u6807\u8bc6\u7b26\u547d\u540d\u89c4\u8303<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u53d8\u91cf\u3001\u51fd\u6570\u7684\u547d\u540d\u5fc5\u987b\u8981\u6709\u610f\u4e49<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u53d8\u91cf\u7684\u540d\u79f0\u4e00\u822c\u7528\u540d\u8bcd<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u51fd\u6570\u7684\u540d\u79f0\u4e00\u822c\u7528\u52a8\u8bcd<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">2.\u64cd\u4f5c\u7b26\u89c4\u8303<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">\/\/ \u64cd\u4f5c\u7b26\u7684\u5de6\u53f3\u4e24\u4fa7\u5404\u4fdd\u7559\u4e00\u4e2a\u7a7a\u683c\r\nfor (var i = 1; i &lt;= 5; i++) {\r\n  if (i == 3) {\r\n      break; \/\/ \u76f4\u63a5\u9000\u51fa\u6574\u4e2a for \u5faa\u73af\uff0c\u8df3\u5230\u6574\u4e2afor\u5faa\u73af\u4e0b\u9762\u7684\u8bed\u53e5\r\n  }\r\n  console.log('\u6211\u6b63\u5728\u5403\u7b2c' + i + '\u4e2a\u5305\u5b50\u5462');\r\n}<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">3.\u5355\u884c\u6ce8\u91ca\u89c4\u8303<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\"> for (var i = 1; i &lt;= 5; i++) {\r\n  if (i == 3) {\r\n      break; \/\/ \u5355\u884c\u6ce8\u91ca\u524d\u9762\u6ce8\u610f\u6709\u4e2a\u7a7a\u683c\r\n  }\r\n  console.log('\u6211\u6b63\u5728\u5403\u7b2c' + i + '\u4e2a\u5305\u5b50\u5462');\r\n}<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">4.\u5176\u5b83\u89c4\u8303<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">4. \u5176\u4ed6\u89c4\u8303\r\n\/\/\u5173\u952e\u8bcd \u64cd\u4f5c\u7b26\u7a7a\u683c\r\nif (true) {}\r\nfor (var i = 0; i&lt;=10; i++) {}<\/pre>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u516d\u3001\u6570\u7ec4\u4e0e\u51fd\u6570<\/span><\/h2>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u6570\u7ec4<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">1. \u6570\u7ec4\u7684\u6982\u5ff5<\/span><\/strong><\/span><span class=\"md-plain\"> \u4e00\u7ec4\u6570\u636e\u7684\u96c6\u5408\uff0c\u5176\u4e2d\u7684\u6bcf\u4e2a\u6570\u636e\u88ab\u79f0\u4f5c<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u5143\u7d20<\/code><\/span><span class=\"md-plain\">\uff0c\u5728\u6570\u7ec4\u4e2d\u53ef\u4ee5\u5b58\u653e\u4efb\u610f\u7c7b\u578b\u7684\u5143\u7d20\u3002\u6570\u7ec4\u662f\u4e00\u79cd\u5c06\u4e00\u7ec4\u6570\u636e\u5b58\u50a8\u5728\u5355\u4e2a\u53d8\u91cf\u540d\u4e0b\u7684\u4f18\u96c5\u65b9\u5f0f\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">2. \u521b\u5efa\u6570\u7ec4<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5229\u7528new\u5173\u952e\u5b57\u521b\u5efa\u6570\u7ec4\uff1b<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">    var \u6570\u7ec4\u540d = new Array([n]);\/\/[]\u4ee3\u8868\u53ef\u9009 \u82e5\u5199n\uff0c\u5219\u4ee3\u8868\u6570\u7ec4\u7684\u957f\u5ea6\r\n    var arr = new Array();\/\/\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3a arr \u7684\u7a7a\u6570\u7ec4<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5229\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u521b\u5efa\u6570\u7ec4<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">    \/\/ 1. \u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u65b9\u5f0f\u521b\u5efa\u7a7a\u7684\u6570\u7ec4\r\n    var \u6570\u7ec4\u540d = [];\/\/\u82e5\u5199n\uff0c\u5219\u4ee3\u8868\u6570\u7ec4\u7684\u957f\u5ea6\r\n    \r\n    \/\/2. \u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u65b9\u5f0f\u521b\u5efa\u5e26\u521d\u59cb\u503c\u7684\u6570\u7ec4\r\n    \/\/3. \u58f0\u660e\u6570\u7ec4\u5e76\u8d4b\u503c\u79f0\u4e3a\u6570\u7ec4\u7684\u521d\u59cb\u5316\r\n    var arr =['1','2','3','4'];\r\n    var arr2 = ['fan',true,17.5];\/\/\u6570\u7ec4\u4e2d\u53ef\u4ee5\u5b58\u653e\u4efb\u610f\u7c7b\u578b\u7684\u6570\u636e<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">3. \u8bbf\u95ee\u6570\u7ec4\u5143\u7d20<\/span><\/strong><\/span><span class=\"md-plain\"> \u7d22\u5f15(\u4e0b\u6807):\u7528\u6765\u8bbf\u95ee\u6570\u7ec4\u5143\u7d20\u7684\u5e8f\u53f7\u3002\u7d22\u5f15\u4ece <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>0<\/code><\/span><span class=\"md-plain\"> \u5f00\u59cb<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/ \u5b9a\u4e49\u6570\u7ec4\r\n  var arrStus = [1,2,3];\r\n  \/\/ \u83b7\u53d6\u6570\u7ec4\u4e2d\u7684\u7b2c2\u4e2a\u5143\u7d20 \r\n  alert(arrStus[1]); \r\n  \/\/ \u5982\u679c\u8bbf\u95ee\u6570\u7ec4\u65f6\u6ca1\u6709\u548c\u7d22\u5f15\u503c\u5bf9\u5e94\u7684\u5143\u7d20(\u6570\u7ec4\u8d8a\u754c)\uff0c\r\n  \/\/ \u8fd4\u56de\u503c\u4e3aundefined<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">4. \u904d\u5386\u6570\u7ec4<\/span><\/strong><\/span><span class=\"md-plain\"> \u628a\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u4ece\u5934\u5230\u5c3e\u90fd\u8bbf\u95ee\u4e00\u6b21\u3002<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\"> \/\/ \u6570\u7ec4\u7684\u957f\u5ea6,\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u7b49\u4e8e\u5143\u7d20\u7684\u4e2a\u6570\r\n \/\/ \u5f53\u6211\u4eec\u6570\u7ec4\u91cc\u9762\u7684\u5143\u7d20\u53d1\u751f\u4e86\u53d8\u5316\uff0clength\u5c5e\u6027\u8ddf\u7740\u4e00\u8d77\u53d8\r\n \/\/ \u5982\u679c\u8bbe\u7f6e\u7684length\u5c5e\u6027\u503c\u5927\u4e8e\u6570\u7ec4\u7684\u5143\u7d20\u4e2a\u6570\uff0c\u5219\u4f1a\u5728\u6570\u7ec4\u672b\u5c3e\u51fa\u73b0\u7a7a\u767d\u5143\u7d20\uff1b\r\n \/\/ \u5982\u679c\u8bbe\u7f6e\u7684length\u5c5e\u6027\u503c\u5c0f\u4e8e\u6570\u7ec4\u7684\u5143\u7d20\u4e2a\u6570\uff0c\u5219\u4f1a\u628a\u8d85\u8fc7\u8be5\u503c\u7684\u6570\u7ec4\u5143\u7d20\u5220\u9664\r\n  var arr = [\"red\", \"blue\", \"green\"];\r\n  for (var i = 0; i &lt; arr.length; i++) {\r\n    console.log(arr[i]);\r\n  }\r\n  \r\n  arr.length = 2;\r\n  console.log(arr);\/\/ red blue<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">5. \u6570\u7ec4\u4e2d\u65b0\u589e\u5143\u7d20<\/span><\/strong><\/span><span class=\"md-plain\"> \u6570\u7ec4\u4e2d\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5728\u6570\u7ec4\u7684\u672b\u5c3e\u63d2\u5165\u65b0\u5143\u7d20;<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/ 1. \u6570\u7ec4[\u6570\u7ec4.length] = \u65b0\u6570\u636e;\r\n  arr = [] \/\/arr.length = 0;\r\n  for (var i = 0; i &lt; 10; i++) {\r\n    arr[arr.length] = '0';\r\n  }\r\n  console.log(arr);<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">6. \u6848\u4f8b<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/ 1. \u7b5b\u9009\u6570\u7ec4 \u5927\u4e8e10\u7684\u5143\u7d20\u9009\u51fa\u6765\u653e\u5230\u65b0\u6570\u7ec4\u4e2d\r\n  var arr = [2, 0, 6, 1, 77, 0, 52, 0, 25, 7];\r\n  var newArr = [];\r\n  var j = 0;\r\n  for (var i = 0;i &lt; arr.length; i++){\r\n    if (arr[i] &gt;= 10) {\r\n      newArr[j] = arr[i];\r\n      j++;\r\n    }\r\n  }\r\n  console.log(newArr);\r\n  \/\/\u7b2c\u4e8c\u79cd\u65b9\u6cd5 \u5229\u7528\u6570\u7ec4\u957f\u5ea6\u7684\u53ef\u53d8\u6027\r\n  for (var i = 0;i &lt; arr.length; i++){\r\n    if (arr[i] &gt;= 10) {\r\n      newArr[j] = arr[i];\r\n      j++;\r\n    }\r\n  }\r\n  \/\/ 2. \u7ffb\u8f6c\u6570\u7ec4 \r\n  \/\/  \u628a\u65e7\u6570\u7ec4\u7d22\u5f15\u53f7\u7b2c4\u4e2a\u53d6\u8fc7\u6765\uff08arr.length - 1)\uff0c\u7ed9\u65b0\u6570\u7ec4\u7d22\u5f15\u53f7\u7b2c0\u4e2a\u5143\u7d20 (newArr.length)\r\n  \/\/  \u6211\u4eec\u91c7\u53d6 \u9012\u51cf\u7684\u65b9\u5f0f  i--\r\n  var arr = ['red', 'green', 'blue', 'pink', 'purple'];\r\n  var newArr = [];\r\n  for(var i = arr.length - 1; i &gt;= 0;i--) {\r\n    newArr[newArr.length] = arr[i]\r\n  }\r\n  console.log(newArr);\r\n  \/\/ 3. \u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32 \u7528\"|\" \u6216\u5176\u4ed6\u7b26\u53f7\u5206\u5272\r\n  \/\/ \u9700\u8981\u4e00\u4e2a\u65b0\u53d8\u91cf\u7528\u4e8e\u5b58\u653e\u8f6c\u6362\u5b8c\u7684\u5b57\u7b26\u4e32str\r\n  \/\/\u904d\u5386\u53d6\u51fa\u6570\u636e\u52a0\u5230str\u540e\u9762\u7136\u540e\u52a0\u4e0a\u5206\u9694\u7b26\r\n  var arr = ['red', 'green', 'blue', 'pink', 'purple'];\r\n  var str = '';\r\n  for(var i = 0; i &lt; arr.length; i++) {\r\n    str += arr[i] + '|';\r\n  }\r\n  console.log(str);\r\n  \/\/ 4. \u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32 \u7528\"|\" \u6216\u5176\u4ed6\u7b26\u53f7\u5206\u5272\r\n  \/\/ \u9700\u8981\u4e00\u4e2a\u65b0\u53d8\u91cf\u7528\u4e8e\u5b58\u653e\u8f6c\u6362\u5b8c\u7684\u5b57\u7b26\u4e32str\r\n  \/\/\u904d\u5386\u53d6\u51fa\u6570\u636e\u52a0\u5230str\u540e\u9762\u7136\u540e\u52a0\u4e0a\u5206\u9694\u7b26\r\n  var arr = ['red', 'green', 'blue', 'pink', 'purple'];\r\n  var str = '';\r\n  for(var i = 0; i &lt; arr.length; i++) {\r\n    str += arr[i] + '|';\r\n  }\r\n  console.log(str);\r\n\u5192\u6ce1\u6392\u5e8f\r\n  function sort(arr) {\r\n    for(var i = 0; i &lt; arr.length - 1; i++) {\r\n      for(var j = 0; j &lt; arr.length - 1 - i; j++) {\r\n        if (arr[j] &gt; arr[j+1]){\r\n          var temp = arr[j];\r\n          arr[j] = arr[j+1];\r\n          arr[j+1] = temp;\r\n        }\r\n      }\r\n    }\r\n    return arr;\r\n  }\r\n  var arr1 = sort([1,4,2,9]); \r\n  console.log(arr1);\/\/1 2 4 9<\/pre>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u51fd\u6570<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">1. \u51fd\u6570\u7684\u6982\u5ff5<\/span><\/strong><\/span><span class=\"md-plain\"> \u5c01\u88c5\u4e86\u4e00\u6bb5\u53ef\u88ab\u91cd\u590d\u8c03\u7528\u6267\u884c\u7684\u4ee3\u7801\u5757\uff0c\u901a\u8fc7\u51fd\u6570\u53ef\u4ee5\u5b9e\u73b0\u5927\u91cf\u4ee3\u7801\u7684\u91cd\u590d\u4f7f\u7528\u3002\u51fd\u6570\u662f\u4e00\u79cd\u6570\u636e\u7c7b\u578b\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">2. \u51fd\u6570\u7684\u4f7f\u7528<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u58f0\u660e\u51fd\u6570<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  1. \u901a\u8fc7function\u5173\u952e\u5b57\u5b9a\u4e49\u51fd\u6570 -- \u547d\u540d\u51fd\u6570\r\n  function \u51fd\u6570\u540d() {\r\n    \/\/\u51fd\u6570\u4f53\u4ee3\u7801\r\n  }\r\n  \/\/ 1.1 function \u662f\u58f0\u660e\u51fd\u6570\u7684\u5173\u952e\u5b57\uff0c\u5fc5\u987b\u5c0f\u5199\r\n  \/\/ 1.2 \u51fd\u6570\u540d \u547d\u540d\u4e3a\u52a8\u8bcd\u5f62\u5f0f \u4f8b: getSum\r\n  \r\n   2. \u901a\u8fc7\u51fd\u6570\u8868\u8fbe\u5f0f\u5b9a\u4e49\u51fd\u6570 ---\u533f\u540d\u51fd\u6570\r\n  var fn = function() {};\r\n  \/\/ 2.1 fn\u662f\u53d8\u91cf\u540d\uff0c\u4e0d\u662f\u51fd\u6570\u540d\r\n  \/\/ 2.2 fn\u662f\u53d8\u91cf\uff0c\u53ea\u4e0d\u8fc7\u53d8\u91cf\u5b58\u50a8\u7684\u662f\u51fd\u6570\r\n  \/\/ 2.3 \u51fd\u6570\u8868\u8fbe\u5f0f\u521b\u5efa\u7684\u51fd\u6570\u53ef\u4ee5\u901a\u8fc7 \u53d8\u91cf\u540d(); \u6765\u8c03\u7528\r\n  \/\/ 2.4 \u51fd\u6570\u8868\u8fbe\u5f0f\u4e5f\u53ef\u4ee5\u5b9a\u4e49\u5f62\u53c2\u548c\u8c03\u7528\u4f20\u5165\u5b9e\u53c2\u3002\r\n  \u533f\u540d\u51fd\u6570\u4f7f\u7528\u7684\u7b2c2\u79cd\u65b9\u5f0f--\u533f\u540d\u51fd\u6570\u81ea\u8c03\u7528\r\n  (function(){\r\n    alert(123);\r\n  })();<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8c03\u7528\u51fd\u6570<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \u51fd\u6570\u540d();\/\/ \u51fd\u6570\u58f0\u660e\u540e\u8c03\u7528\u624d\u4f1a\u6267\u884c\u51fd\u6570\u4f53\u4ee3\u7801<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u51fd\u6570\u7684\u5c01\u88c5<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u51fd\u6570\u7684\u5c01\u88c5\u662f\u628a\u4e00\u4e2a\u6216\u8005\u591a\u4e2a\u529f\u80fd\u901a\u8fc7\u51fd\u6570\u7684\u65b9\u5f0f\u5c01\u88c5\u8d77\u6765\uff0c\u5bf9\u5916\u53ea\u63d0\u4f9b\u4e00\u4e2a\u7b80\u5355\u7684\u51fd\u6570\u63a5\u53e3\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/*\r\n    \u4f8b\u7528\u5c01\u88c5\u51fd\u6570\u8ba1\u7b971-100\u7d2f\u52a0\u548c\r\n  *\/\r\n  function getSum() {\r\n  var sumNum = 0; \/\/ \u51c6\u5907\u4e00\u4e2a\u53d8\u91cf\uff0c\u4fdd\u5b58\u7d2f\u52a0\u548c\r\n  for (var i = 1; i &lt;= 100; i++) {\r\n    sumNum += i; \/\/ \u628a\u6bcf\u4e2a\u6570\u503c \u90fd\u7d2f\u52a0 \u5230\u53d8\u91cf\u4e2d\r\n  }\r\n    alert(sumNum);\r\n  }\r\n  \/\/ \u8c03\u7528\u51fd\u6570\r\n  getSum();<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">3. \u51fd\u6570\u7684\u53c2\u6570<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5f62\u53c2\uff1a\u51fd\u6570\u5b9a\u4e49\u65f6\u5019\uff0c\u4f20\u9012\u7684\u53c2\u6570(\u5b9e\u53c2\u503c\u4f20\u9012\u7ed9\u5f62\u53c2,\u4e0d\u7528\u58f0\u660e\u7684\u53d8\u91cf)<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5b9e\u53c2\uff1a\u51fd\u6570\u8c03\u7528\u65f6\u5019\uff0c\u4f20\u9012\u7684\u53c2\u6570<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/\u5e26\u53c2\u6570\u7684\u51fd\u6570\u58f0\u660e\r\n  function \u51fd\u6570\u540d(\u5f62\u53c21,\u5f62\u53c22,\u5f62\u53c23...) {\r\n    \/\/\u51fd\u6570\u4f53\r\n  }\r\n  \/\/ \u5e26\u53c2\u6570\u7684\u51fd\u6570\u8c03\u7528\r\n  \u51fd\u6570\u540d(\u5b9e\u53c21,\u5b9e\u53c22,\u5b9e\u53c23...);<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u300c\u51fd\u6570\u5f62\u53c2\u548c\u5b9e\u53c2\u6570\u91cf\u4e0d\u5339\u914d\u65f6\u300d<\/span><\/strong><\/span><\/p>\n<\/li>\n<\/ul>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u53c2\u6570\u4e2a\u6570<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5b9e\u53c2\u4e2a\u6570\u7b49\u4e8e\u5f62\u53c2\u4e2a\u6570<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8f93\u51fa\u6b63\u786e\u7ed3\u679c<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5b9e\u53c2\u4e2a\u6570\u591a\u4e8e\u5f62\u53c2\u4e2a\u6570<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u53ea\u53d6\u5230\u5f62\u53c2\u7684\u4e2a\u6570<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5b9e\u53c2\u4e2a\u6570\u5c0f\u4e8e\u5f62\u53c2<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u591a\u7684\u5f62\u53c2\u5b9a\u4e49\u4e3aundefined,\u7ed3\u679c\u4e3aNaN<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">      function getSum(a, b, c) {\r\n        return a + b + c;\r\n      }\r\n      \/\/ js\u4e2d\u5f62\u53c2\u7684\u9ed8\u8ba4\u503c\u662fundefined\u3002\r\n      \/\/ \u8c03\u7528\u51fd\u6570\r\n      var n = getSum(1, 2);\/\/ n = NaN\r\n      var n = getSum(1, 2, 3, 4); \/\/1 + 2 +3 = 6<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">4. \u51fd\u6570\u7684\u8fd4\u56de\u503c<\/span><\/strong><\/span><span class=\"md-plain\"> \u8fd4\u56de\u503c\uff1a\u51fd\u6570\u8c03\u7528\u6574\u4f53\u4ee3\u8868\u7684\u6570\u636e\uff1b\u51fd\u6570\u6267\u884c\u5b8c\u6210\u540e\u53ef\u4ee5\u901a\u8fc7return\u8bed\u53e5\u5c06\u6307\u5b9a\u6570\u636e\u8fd4\u56de \u3002<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/ \u58f0\u660e\u51fd\u6570\r\n  function \u51fd\u6570\u540d() {\r\n    ...\r\n    return \u9700\u8981\u8fd4\u56de\u7684\u503c;\r\n    \/\/ 1. \u51fd\u6570\u9047\u5230return\u4f1a\u505c\u6b62\u6267\u884c\uff0c\u5e76\u8fd4\u56de\u6307\u5b9a\u7684\u503c\r\n    \/\/ 1. \u5982\u679c\u51fd\u6570\u6ca1\u6709return \u8fd4\u56de\u7684\u503c\u662fundefined\r\n  }\r\n  \/\/ \u8c03\u7528\u51fd\u6570\r\n  \u51fd\u6570\u540d(); \/\/\u6b64\u65f6\u8c03\u7528\u51fd\u6570\u5c31\u53ef\u4ee5\u5f97\u5230\u51fd\u6570\u4f53\u5185return\u7684\u503c\r\nbreak,continue,return\u7684\u533a\u522b<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">break: \u7ed3\u675f\u5f53\u524d\u7684\u5faa\u73af\u4f53 (\u5982for\u3001while)<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">continue: \u8df3\u51fa\u672c\u6b21\u5faa\u73af\uff0c\u7ee7\u7eed\u6267\u884c\u4e0b\u6b21\u5faa\u73af<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">return: \u4e0d\u4ec5\u53ef\u4ee5\u9000\u51fa<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>(\u51fd\u6570\u4f53\u5185)<\/code><\/span><span class=\"md-plain\">\u5faa\u73af\uff0c\u8fd8\u80fd\u591f\u8fd4\u56dereturn\u8bed\u53e5\u4e2d\u7684\u503c\uff0c\u540c\u65f6\u8fd8\u53ef\u4ee5<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u7ed3\u675f\u5f53\u524d\u7684\u51fd\u6570\u4f53\u5185\u7684\u4ee3\u7801<\/code><\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">\/\/\u907f\u514d\u8e29\u5751 return\u53ea\u80fd\u7ed3\u675f\u51fd\u6570\u4f53\u5185\u7684\u4ee3\u7801\r\n  function breakDown() {\r\n    for (var i = 0; i &lt; 10; i++) {\r\n      if (i == 5) {\r\n        return 1;\r\n      }\r\n    console.log(i);\r\n    }\r\n  }\r\n  breakDown();\r\n  \r\n  \/\/\u907f\u514d\u8e29\u57512 \u51fd\u6570\u5982\u679c\u6709return \u5219\u8fd4\u56de\u7684\u662f return \u540e\u9762\u7684\u503c\uff1b\r\n  \/\/ return d,a,b; \u8fd4\u56de\u7684\u662fb\u7684\u503c\r\n  \/\/\u5982\u679c\u51fd\u6570\u6ca1\u6709 return\u8bed\u53e5\uff0c\u5219\u8fd4\u56deundefined<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">5. arguments\u7684\u4f7f\u7528<\/span><\/strong><\/span><span class=\"md-plain\"> \u5f53\u4e0d\u786e\u5b9a\u6709\u591a\u5c11\u4e2a\u53c2\u6570\u4f20\u9012\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u7528 arguments \u6765\u83b7\u53d6\u3002JS\u4e2d\uff0carguments\u5b9e\u9645\u4e0a\u5b83\u662f\u5f53\u524d\u51fd\u6570\u7684\u4e00\u4e2a\u5185\u7f6e\u5bf9\u8c61\u3002\u6240\u6709\u51fd\u6570\u90fd\u5185\u7f6e\u4e86\u4e00\u4e2a arguments \u5bf9\u8c61\uff0carguments \u5bf9\u8c61\u4e2d\u5b58\u50a8\u4e86\u4f20\u9012\u7684\u6240\u6709\u5b9e\u53c2\u3002arguments\u5c55\u793a\u5f62\u5f0f\u662f\u4e00\u4e2a\u4f2a\u6570\u7ec4\uff0c\u56e0\u6b64\u53ef\u4ee5\u8fdb\u884c\u904d\u5386\u3002<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u4f2a\u6570\u7ec4\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5177\u6709length\u5c5e\u6027<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6309\u7d22\u5f15\u65b9\u5f0f\u5b58\u50a8\u6570\u636e<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u4e0d\u5177\u6709\u6570\u7ec4\u7684push\uff0cpop\u7b49\u65b9\u6cd5<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  function fn() {\r\n    \/\/arguments \u91cc\u9762\u5b58\u50a8\u4e86\u6240\u6709\u4f20\u9012\u8fc7\u6765\u7684\u5b9e\u53c2\r\n    console.log(arguments);\/\/ [1,2,3...]\r\n    console.log(arguments[1]); \/\/ 2\r\n    console.log(arguments.length); \/\/ 3\r\n    \r\n    \/\/\u6211\u4eec\u53ef\u4ee5\u6309\u7167\u6570\u7ec4\u7684\u65b9\u5f0f \u904d\u5386argument  \r\n  }\r\n  fn(1, 2, 3);\r\n \/\/ \u7528\u4f2a\u6570\u7ec4 \u5b9e\u73b0\u6c42\u6700\u5927\u503c\r\n function getMax() {\r\n    var max = arguments[0];\r\n    for (var i = 1; i &lt; arguments.length; i++) {\r\n      if (arguments[i] &gt; arguments[0]) {\r\n        max = arguments[i];\r\n      }\r\n    }\r\n    return max;\r\n  }\r\n  var result = getMax(1,3,77,5,85)\r\n  colsole.log(result);<\/pre>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u4e03\u3001\u4f5c\u7528\u57df<\/span><\/h2>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u4f5c\u7528\u57df<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u4f5c\u7528\u57df<\/span><\/strong><\/span><span class=\"md-plain\">\u4e00\u6bb5\u7a0b\u5e8f\u4ee3\u7801\u4e2d\u6240\u7528\u5230\u7684\u540d\u5b57\u5e76\u4e0d\u603b\u662f\u6709\u6548\u548c\u53ef\u9760\u7684\uff0c\u800c\u9650\u5b9a\u8fd9\u4e2a\u540d\u5b57\u7684\u53ef\u7528\u6027\u4ee3\u7801\u8303\u56f4\u5c31\u662f\u8fd9\u4e2a\u540d\u5b57\u7684\u4f5c\u7528\u57df\u3002<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u4f5c\u7528\u57df\u7684\u4f7f\u7528\u63d0\u9ad8\u4e86\u7a0b\u5e8f\u903b\u8f91\u7684\u5c40\u90e8\u6027\uff0c\u589e\u5f3a\u4e86\u7a0b\u5e8f\u7684\u53ef\u9760\u6027\uff0c\u51cf\u5c11\u4e86\u540d\u5b57\u51b2\u7a81\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">ES6\u4e4b\u524d\u4f5c\u7528\u57df\u6709\u4e24\u79cd <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u5168\u5c40\u4f5c\u7528\u57df<\/code><\/span><span class=\"md-plain\">\u548c<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u5c40\u90e8\u4f5c\u7528\u57df<\/code><\/span><span class=\"md-plain\">(\u51fd\u6570\u4f5c\u7528\u57df)<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5168\u5c40\u4f5c\u7528\u57df<\/span><\/strong><\/span><span class=\"md-plain\">\u4f5c\u7528\u4e8e\u6240\u6709\u4ee3\u7801\u6267\u884c\u7684\u73af\u5883(\u6574\u4e2a script \u6807\u7b7e\u5185\u90e8)\u6216\u8005\u4e00\u4e2a\u72ec\u7acb\u7684js\u6587\u4ef6\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5c40\u90e8\u4f5c\u7528\u57df<\/span><\/strong><\/span><span class=\"md-plain\">\u4f5c\u7528\u4e8e\u51fd\u6570\u5185\u90e8\u7684\u4ee3\u7801\u73af\u5883\uff0c\u5c31\u662f\u5c40\u90e8\u4f5c\u7528\u57df\u3002\u56e0\u4e3a\u8ddf\u51fd\u6570\u6709\u5173\u7cfb\uff0c\u6240\u4ee5\u4e5f\u88ab\u79f0\u4e3a<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u51fd\u6570\u4f5c\u7528\u57df<\/code><\/span><span class=\"md-plain\">\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">JS\u6ca1\u6709\u5757\u7ea7\u4f5c\u7528\u57df<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5757\u4f5c\u7528\u57df\u7531 {} \u5305\u62ec<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5728\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\uff0cif\u8bed\u53e5\u4e2d\uff0c\u5faa\u73af\u8bed\u53e5\u521b\u5efa\u7684\u53d8\u91cf\uff0c\u4ec5\u4ec5\u53ea\u80fd\u5728\u672cif\u8bed\u53e5\uff0c\u672c\u5faa\u73af\u8bed\u53e5\u4e2d\u4f7f\u7528\uff0c\u5982\u4e0b\ud83d\udc47\ud83d\udc47<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  if(true){\r\n    int num = 123;\r\n    System.out.print(num); \/\/123\r\n  }\r\n  System.out.print(num);\/\/\u62a5\u9519<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u4ee5\u4e0ajava\u4ee3\u7801\u4f1a\u62a5\u9519\uff0c\u56e0\u4e3a\u4ee3\u7801\u4e2d {}\u662f\u4e00\u5757\u4f5c\u7528\u57df\uff0c\u5176\u4e2d\u58f0\u660e\u7684\u53d8\u91cfnum\uff0c\u5728{}\u4e4b\u5916\u4e0d\u80fd\u4f7f\u7528\uff0c\u800cJavaScript\u4ee3\u7801\u5219\u4e0d\u4f1a\u62a5\u9519<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">Js\u4e2d\u6ca1\u6709\u5757\u7ea7\u4f5c\u7528\u57df (\u5728ES6\u4e4b\u524d)<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  if(true){\r\n    var num = 123;\r\n    console.log(num); \/\/ 123\r\n  }\r\n  console.log(num);\/\/ 123<\/pre>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u53d8\u91cf\u7684\u4f5c\u7528\u57df<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5728JavaScript\u4e2d\uff0c\u6839\u636e\u4f5c\u7528\u57df\u7684\u4e0d\u540c\uff0c\u53d8\u91cf\u53ef\u4ee5\u5206\u4e3a\u4e24\u79cd:\ud83d\udc47<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u5168\u5c40\u53d8\u91cf<\/code><\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u5c40\u90e8\u53d8\u91cf<\/code><\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5168\u5c40\u53d8\u91cf<\/span><\/strong><\/span><span class=\"md-plain\">\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e0b\u58f0\u660e\u7684\u53d8\u91cf(\u5728\u51fd\u6570\u5916\u90e8\u5b9a\u4e49\u7684\u53d8\u91cf)<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5168\u5c40\u53d8\u91cf\u5728\u4ee3\u7801\u7684\u4efb\u4f55\u4f4d\u7f6e\u90fd\u53ef\u4ee5\u4f7f\u7528<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e0b var \u58f0\u660e\u7684\u53d8\u91cf \u662f\u5168\u5c40\u53d8\u91cf<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7279\u6b8a\u60c5\u51b5\u4e0b\uff0c\u5728\u51fd\u6570\u5185\u4e0d\u4f7f\u7528var\u58f0\u660e\u7684\u53d8\u91cf\u4e5f\u662f\u5168\u5c40\u53d8\u91cf(\u4e0d\u5efa\u8bae\u4f7f\u7528)\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5c40\u90e8\u53d8\u91cf<\/span><\/strong><\/span><span class=\"md-plain\">\u5728\u5c40\u90e8\u4f5c\u7528\u57df\u4e0b\u58f0\u660e\u7684\u53d8\u91cf(\u5728\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\u7684\u53d8\u91cf)<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5c40\u90e8\u53d8\u91cf\u53ea\u80fd\u5728\u51fd\u6570\u5185\u90e8\u4f7f\u7528<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5728\u51fd\u6570\u5185\u90e8 var\u58f0\u660e\u7684\u53d8\u91cf\u662f\u5c40\u90e8\u53d8\u91cf<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u51fd\u6570\u7684\u5f62\u53c2\u5b9e\u9645\u4e0a\u5c31\u662f\u5c40\u90e8\u53d8\u91cf<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5168\u5c40\u53d8\u91cf\u548c\u5c40\u90e8\u53d8\u91cf\u7684\u533a\u522b<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u5168\u5c40\u53d8\u91cf:<\/code><\/span><span class=\"md-plain\">\u5728\u4efb\u4f55\u4e00\u4e2a\u5730\u65b9\u90fd\u53ef\u4ee5\u4f7f\u7528\uff0c\u53ea\u6709\u5728\u6d4f\u89c8\u5668\u5173\u95ed\u65f6\u624d\u4f1a\u9500\u6bc1\uff0c\u56e0\u6b64\u6bd4\u8f83\u5360\u5185\u5b58<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u5c40\u90e8\u53d8\u91cf:<\/code><\/span><span class=\"md-plain\">\u65e8\u5728\u51fd\u6570\u5185\u90e8\u4f7f\u7528\uff0c\u5f53\u5176\u6240\u5728\u7684\u4ee3\u7801\u5757\u88ab\u6267\u884c\u65f6\uff0c\u624d\u4f1a\u88ab\u521d\u59cb\u5316\uff1b\u5f53\u4ee3\u7801\u5757\u8fd0\u884c\u7ed3\u675f\u540e\uff0c\u5c31\u4f1a\u88ab\u9500\u6bc1\uff0c\u56e0\u6b64\u66f4\u8282\u7701\u5185\u5b58\u7a7a\u95f4\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u4f5c\u7528\u57df\u94fe<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u4f5c\u7528\u57df\u94fe<\/span><\/strong><\/span><span class=\"md-plain\">\u53ea\u8981\u662f\u4ee3\u7801\u90fd\u5728\u4e00\u4e2a\u4f5c\u7528\u57df\u4e2d\uff0c\u5199\u5728\u51fd\u6570\u5185\u90e8\u7684\u5c40\u90e8\u4f5c\u7528\u57df\uff0c\u672a\u5378\u8f7d\u4ecd\u548c\u884c\u6570\u5185\u90e8\u5373\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\uff1b\u5982\u679c\u51fd\u6570\u4e2d\u8fd8\u6709\u51fd\u6570\uff0c\u90a3\u4e48\u5728\u8fd9\u4e2a\u4f5c\u7528\u57df\u4e2d\u5c31\u53c8\u53ef\u4ee5\u8bde\u751f\u4e00\u4e2a\u4f5c\u7528\u57df\uff1b\u6839\u636e<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>[\u5185\u90e8\u51fd\u6570\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u51fd\u6570\u53d8\u91cf]<\/code><\/span><span class=\"md-plain\"> \u7684\u8fd9\u79cd\u673a\u5236\uff0c\u7528\u94fe\u5f0f\u67e5\u627e\u51b3\u5b9a\u54ea\u4e9b\u6570\u636e\u80fd\u88ab\u5185\u90e8\u51fd\u6570\u8bbf\u95ee\uff0c\u5c31\u79f0\u4f5c\u4f5c\u7528\u57df\u94fe\u3002<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  function f1() {\r\n      var num = 123;\r\n      function f2() {\r\n          console.log( num );\r\n      }\r\n      f2();\r\n  }\r\n  var num = 456;\r\n  f1();<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u4f5c\u7528\u57df\u94fe<\/code><\/span><span class=\"md-plain\">\u91c7\u53d6\u5c31\u8fd1\u539f\u5219\u7684\u65b9\u5f0f\u6765\u67e5\u627e\u53d8\u91cf\u6700\u7ec8\u7684\u503c<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  var a = 1;\r\n  function fn1() {\r\n      var a = 2;\r\n      var b = '22';\r\n      fn2();\r\n      function fn2() {\r\n          var a = 3;\r\n          fn3();\r\n          function fn3() {\r\n              var a = 4;\r\n              console.log(a); \/\/a\u7684\u503c 4\r\n              console.log(b); \/\/b\u7684\u503c '22'\r\n          }\r\n      }\r\n  }\r\n  fn1();<\/pre>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u9884\u89e3\u6790<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u9884\u89e3\u6790\u76f8\u5173\u6982\u5ff5<\/span><\/strong><\/span><span class=\"md-plain\">JavaScript\u4ee3\u7801\u662f\u7531\u6d4f\u89c8\u5668\u4e2d\u7684JavaScript\u89e3\u6790\u5668\u6765\u6267\u884c\u7684\u3002JavaScript\u89e3\u6790\u5668\u5728\u8fd0\u884cJavaScript\u4ee3\u7801\u7684\u65f6\u5019\u5206\u4e3a\u4e24\u6b65:\u9884\u89e3\u6790\u548c\u4ee3\u7801\u6267\u884c\u3002<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u9884\u89e3\u6790<\/span><\/strong><\/span><span class=\"md-plain\">\u5728\u5f53\u524d\u4f5c\u7528\u57df\u4e0b\uff0cJS\u4ee3\u7801\u6267\u884c\u4e4b\u524d\uff0c\u6d4f\u89c8\u5668\u4f1a\u9ed8\u8ba4\u628a\u5e26\u6709 var \u548c function\u58f0\u660e\u7684\u53d8\u91cf\u5728\u5185\u5b58\u4e2d\u8fdb\u884c\u63d0\u524d\u58f0\u660e\u6216\u5b9a\u4e49\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u4ee3\u7801\u6267\u884c<\/span><\/strong><\/span><span class=\"md-plain\">\u4ece\u4e0a\u5f80\u4e0b\u6267\u884cJS\u8bed\u53e5<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u9884\u89e3\u6790\u4f1a\u628a\u53d8\u91cf\u548c\u51fd\u6570\u7684\u58f0\u660e\u5728\u4ee3\u7801\u6267\u884c\u4e4b\u524d\u5b8c\u6210\uff0c\u9884\u89e3\u6790\u4e5f\u53eb\u505a\u53d8\u91cf\u3001\u51fd\u6570\u63d0\u5347\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u53d8\u91cf\u9884\u89e3\u6790(\u53d8\u91cf\u63d0\u5347)<\/span><\/strong><\/span><span class=\"md-plain\"> \u53d8\u91cf\u7684\u58f0\u660e\u4f1a\u88ab\u63d0\u5347\u5230\u5f53\u524d\u4f5c\u7528\u57df\u7684\u6700\u4e0a\u9762\uff0c\u53d8\u91cf\u7684\u8d4b\u503c\u4e0d\u63d0\u5347\u3002<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  console.log(num);  \/\/ \u7ed3\u679c\u662f\u591a\u5c11\uff1f\r\n  var num = 10;      \/\/ \uff1f\r\n  \r\n  \u76f8\u5f53\u4e8e\r\n  var num;\r\n  console.log(num);\/\/ \u7ed3\u679c\u662f undefined\r\n  num = 10;\r\n  \u7ed3\u679c: undefined\r\n  \u6ce8\u610f: \u53d8\u91cf\u63d0\u5347\u53ea\u63d0\u5347\u58f0\u660e\uff0c\u4e0d\u63d0\u5347\u8d4b\u503c\u3002<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u51fd\u6570\u9884\u89e3\u6790(\u51fd\u6570\u63d0\u5347)<\/span><\/strong><\/span><span class=\"md-plain\"> \u51fd\u6570\u7684\u58f0\u660e\u4f1a\u88ab\u63d0\u5347\u5230\u5f53\u524d\u4f5c\u7528\u57df\u7684\u6700\u4e0a\u9762\uff0c\u4f46\u662f\u4e0d\u4f1a\u8c03\u7528\u51fd\u6570\u3002<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  fn();\r\n  function fn() {\r\n      console.log('\u6253\u5370');\r\n  }\r\n  \u7ed3\u679c: \u63a7\u5236\u53f0\u6253\u5370\u5b57\u7b26\u4e32 --- \"\u6253\u5370\"\r\n  \u6ce8\u610f: \u51fd\u6570\u58f0\u660e\u4ee3\u8868\u51fd\u6570\u6574\u4f53\uff0c\u6240\u4ee5\u51fd\u6570\u63d0\u5347\u540e\uff0c\u51fd\u6570\u540d\u4ee3\u8868\u6574\u4e2a\u51fd\u6570\uff0c\u4f46\u662f\u51fd\u6570\u5e76\u6ca1\u6709\u88ab\u8c03\u7528\uff01<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u51fd\u6570\u8868\u8fbe\u5f0f\u58f0\u660e\u51fd\u6570\u95ee\u9898<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \u51fd\u6570\u8868\u8fbe\u5f0f\u521b\u5efa\u51fd\u6570\uff0c\u4f1a\u6267\u884c\u53d8\u91cf\u63d0\u5347\uff0c\u6b64\u65f6\u63a5\u6536\u51fd\u6570\u7684\u53d8\u91cf\u540d\u65e0\u6cd5\u6b63\u786e\u7684\u8c03\u7528\r\n  fn();\r\n  var fn = function(){\r\n    console.log(\"\u60f3\u4e0d\u5230\u5427\");\r\n  }\r\n  \u7ed3\u679c:\u62a5\u9519\u63d0\u793a \"fn is not a function\"\r\n  \u89e3\u91ca: \u8be5\u6bb5\u4ee3\u7801\u6267\u884c\u4e4b\u524d\uff0c\u4f1a\u505a\u53d8\u91cf\u58f0\u660e\u63d0\u5347\uff0cfn\u5728\u63d0\u5347\u4e4b\u540e\u7684\u503c\u662fundefined;\u800cfn\u8c03\u7528\u662f\u5728fn\u88ab\u8d4b\u503c\u4e3a\u51fd\u6570\u4f53\u4e4b\u524d\uff0c\u6b64\u65f6fn\u7684\u503c\u662fundefined\uff0c\u6240\u4ee5\u65e0\u6cd5\u88ab\u8c03\u7528\u3002\r\n  \u9884\u89e3\u6790\u6848\u4f8b1\r\n  var num = 10;\r\n  fun();\r\n  \r\n  function fun(){\r\n    console.log(num);\r\n    var num = 20;\r\n  }\r\n  \r\n  \u76f8\u5f53\u4e8e\u6267\u884c\u4e86\u4ee5\u4e0b\u64cd\u4f5c \u7ed3\u679c\u6253\u5370 undefined\r\n  var num;\r\n  \r\n  function fun(){\r\n    var num;\r\n    console.log(num);\r\n    num = 20;\r\n  }\r\n  num = 10;\r\n  fun();\r\n\u9884\u89e3\u6790\u6848\u4f8b2\r\n  var a = 18;\r\n  f1();\r\n  \r\n  function f1(){\r\n    var b = 9;\r\n    console.log(a);\r\n    console.log(b);\r\n    var a = '123';\r\n  }\r\n  \r\n  \u76f8\u5f53\u4e8e\u6267\u884c\u4e86\u4ee5\u4e0b\u64cd\u4f5c \u7ed3\u679c\u4e3a undefined 9\r\n  var a;\r\n  function f1(){\r\n    var b;\r\n    var a;\r\n    b = 9;\r\n    console.log(a);\r\n    console.log(b);\r\n    a = '123';  \r\n  }\r\n  a = 18;\r\n  f1();\r\n  \u9884\u89e3\u6790\u6848\u4f8b3\r\n  f1();\r\n  console.log(c);\r\n  console.log(b);\r\n  console.log(a);\r\n  \r\n  function f1() {\r\n    var a = b = c = 9;\r\n    console.log(a);\r\n    console.log(b);\r\n    console.log(c);\r\n  }\r\n  \r\n  \u76f8\u5f53\u4e8e\u6267\u884c\u4e86\u4ee5\u4e0b\u64cd\u4f5c \u7ed3\u679c\u4e3a 9 9 9 9 9 \"\u62a5\u9519--a is not defined\"\r\n  function f1() {\r\n    var a;\r\n    a = b = c = 9;\r\n    \/\/\u76f8\u5f53\u4e8e var a = 9; b=9; c=9; b\u548cc \u76f4\u63a5\u8d4b\u503c\uff0c\u6ca1\u6709var\u58f0\u660e\uff0c\u5f53\u5168\u5c40\u53d8\u91cf\u770b\u3002\r\n    \/\/ \u5dee\u5f02\uff1a\u96c6\u4f53\u58f0\u660e var a = 9,b = 9, c = 9;\r\n    console.log(a);\r\n    console.log(b);\r\n    console.log(c);\r\n  }\r\n  f1();\r\n  console.log(c);\r\n  console.log(b);\r\n  console.log(a);<\/pre>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u516b\u3001\u5bf9\u8c61<\/span><\/h2>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u5bf9\u8c61\u7684\u6982\u5ff5<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5bf9\u8c61<\/span><\/strong><\/span><span class=\"md-plain\">\u5728JavaScript\u4e2d\uff0c\u5bf9\u8c61\u662f\u4e00\u7ec4\u65e0\u5e8f\u7684\u76f8\u5173\u5c5e\u6027\u548c\u65b9\u6cd5\u7684\u96c6\u5408\uff0c\u6240\u6709\u7684\u4e8b\u7269\u90fd\u662f\u5bf9\u8c61\uff0c\u4f8b\u5982\u5b57\u7b26\u4e32\u3001\u6570\u503c\u3001\u6570\u7ec4\u3001\u51fd\u6570\u7b49\u3002<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5bf9\u8c61\u662f\u7531\u5c5e\u6027\u548c\u65b9\u6cd5\u7ec4\u6210\u7684<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5c5e\u6027\uff1a\u4e8b\u7269\u7684\u7279\u5f81\uff0c\u5728\u5bf9\u8c61\u4e2d\u7528\u5c5e\u6027\u6765\u8868\u793a\uff08\u5e38\u7528\u540d\u8bcd\uff09<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u65b9\u6cd5\uff1a\u4e8b\u7269\u7684\u884c\u4e3a\uff0c\u5728\u5bf9\u8c61\u4e2d\u5e38\u7528\u65b9\u6cd5\u6765\u8868\u793a\uff08\u5e38\u7528\u52a8\u8bcd\uff09<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u4e3a\u4ec0\u4e48\u9700\u8981\u5bf9\u8c61<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u4fdd\u5b58\u4e00\u4e2a\u503c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u53d8\u91cf\uff0c\u4fdd\u5b58\u591a\u4e2a\u503c\uff08\u4e00\u7ec4\u503c\uff09\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u6570\u7ec4\uff0c\u5982\u679c\u4fdd\u5b58\u4e00\u4e2a\u7684\u5b8c\u6574\u4fe1\u606f\u5462\uff1f<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u4e3a\u4e86\u66f4\u597d\u5730\u5b58\u50a8\u4e00\u7ec4\u6570\u636e\uff0c\u5bf9\u8c61\u5e94\u7528\u800c\u751f\uff1b\u5bf9\u8c61\u4e2d\u4e3a\u6bcf\u9879\u6570\u636e\u8bbe\u7f6e\u4e86\u5c5e\u6027\u540d\u79f0\uff0c\u53ef\u4ee5\u8bbf\u95ee\u6570\u636e\u66f4\u8bed\u4e49\u5316\uff0c\u6570\u636e\u7ed3\u6784\u6e05\u6670\uff0c\u8868\u610f\u660e\u663e\uff0c\u65b9\u4fbf\u5f00\u53d1\u8005\u4f7f\u7528\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  var obj = {\r\n    \"name\":\"fan\",\r\n    \"sex\":\"male\",\r\n    \"age\":18,\r\n    \"height\":155\r\n  }<\/pre>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u521b\u5efa\u5bf9\u8c61\u7684\u4e09\u79cd\u65b9\u5f0f<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">1. \u5229\u7528\u5b57\u9762\u91cf\u521b\u5efa\u5bf9\u8c61<\/span><\/strong><\/span><span class=\"md-plain\">\u4f7f\u7528\u5bf9\u8c61\u5b57\u9762\u91cf\u521b\u5efa\u5bf9\u8c61\uff1a<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5c31\u662f\u82b1\u62ec\u53f7 { } \u91cc\u9762\u5305\u542b\u4e86\u8868\u8fbe\u8fd9\u4e2a\u5177\u4f53\u4e8b\u7269\uff08\u5bf9\u8c61\uff09\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff1b{ } \u91cc\u9762\u91c7\u53d6\u952e\u503c\u5bf9\u7684\u5f62\u5f0f\u8868\u793a &#8211;<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u952e<\/code><\/span><span class=\"md-plain\">\uff1a\u76f8\u5f53\u4e8e\u5c5e\u6027\u540d &#8211;<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u503c<\/code><\/span><span class=\"md-plain\">\uff1a\u76f8\u5f53\u4e8e\u5c5e\u6027\u503c\uff0c\u53ef\u4ee5\u662f\u4efb\u610f\u7c7b\u578b\u7684\u503c\uff08\u6570\u5b57\u7c7b\u578b\u3001\u5b57\u7b26\u4e32\u7c7b\u578b\u3001\u5e03\u5c14\u7c7b\u578b\uff0c\u51fd\u6570\u7c7b\u578b\u7b49\uff09<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/ star \u5c31\u662f\u521b\u5efa\u7684\u5bf9\u8c61\r\n  var star = {\r\n    name : 'pink',\r\n    age : 18,\r\n    sex : '\u7537',\r\n    sayHi : function() {\r\n      alert('\u5927\u5bb6\u597d\u554a');\r\n    }\r\n  };<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5bf9\u8c61\u7684\u4f7f\u7528<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5bf9\u8c61\u7684\u5c5e\u6027\uff1a\u5bf9\u8c61\u4e2d<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u5b58\u50a8\u5177\u4f53\u6570\u636e<\/code><\/span><span class=\"md-plain\">\u7684\u201c\u952e\u503c\u5bf9\u201d\u4e2d\u7684\u952e\u79f0\u4e3a\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u5373\u5bf9\u8c61\u4e2d\u5b58\u50a8\u5177\u4f53\u6570\u636e\u7684\u9879\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5bf9\u8c61\u7684\u65b9\u6cd5\uff1a\u5bf9\u8c61\u4e2d<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u5b58\u50a8\u51fd\u6570<\/code><\/span><span class=\"md-plain\">\u7684\u201c\u952e\u503c\u5bf9\u201d\u4e2d\u7684\u201c\u952e\u201d\u79f0\u4e3a\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u5373\u5bf9\u8c61\u4e2d\u5b58\u50a8\u51fd\u6570\u7684\u9879\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8bbf\u95ee\u5bf9\u8c61\u7684\u5c5e\u6027\uff1a\u5bf9\u8c61\u91cc\u9762\u7684\u5c5e\u6027\u8c03\u7528\uff1a<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u5bf9\u8c61.\u5c5e\u6027\u540d<\/code><\/span><span class=\"md-plain\">\uff1b\u5bf9\u8c61\u91cc\u9762\u5c5e\u6027\u7684\u53e6\u4e00\u79cd\u8c03\u7528\u65b9\u5f0f\uff1a\u5bf9\u8c61[&#8216;\u5c5e\u6027\u540d&#8217;],\u6ce8\u610f\u65b9\u62ec\u53f7\u91cc\u9762\u7684\u5c5e\u6027\u5fc5\u987b\u52a0\u4e0a\u5f15\u53f7\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8c03\u7528\u5bf9\u8c61\u7684\u65b9\u6cd5:<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u5bf9\u8c61.\u65b9\u6cd5\u540d();<\/code><\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u53d8\u91cf\u3001\u5c5e\u6027\u3001\u51fd\u6570\u3001\u65b9\u6cd5\u603b\u7ed3\uff1a <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u2460\u53d8\u91cf<\/code><\/span><span class=\"md-plain\">\uff1a\u5355\u72ec\u58f0\u660e\u8d4b\u503c\uff0c\u5355\u72ec\u5b58\u5728 <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u2461\u5c5e\u6027<\/code><\/span><span class=\"md-plain\">:\u5bf9\u8c61\u91cc\u9762\u7684\u53d8\u91cf\u79f0\u4e3a\u5c5e\u6027\uff0c\u4e0d\u9700\u8981\u58f0\u660e\uff0c\u7528\u6765\u63cf\u8ff0\u8be5\u5bf9\u8c61\u7684\u7279\u5f81\u3002 <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u2462\u65b9\u6cd5<\/code><\/span><span class=\"md-plain\">\uff1a\u65b9\u6cd5\u662f\u5bf9\u8c61\u7684\u4e00\u90e8\u5206\uff0c\u51fd\u6570\u4e0d\u662f\u5bf9\u8c61\u7684\u4e00\u90e8\u5206\uff0c\u51fd\u6570\u662f\u5355\u72ec\u5c01\u88c5\u64cd\u4f5c\u7684\u5bb9\u5668\u3002\u5bf9\u8c61\u91cc\u9762\u7684\u51fd\u6570\u79f0\u4e3a\u65b9\u6cd5\uff0c\u65b9\u6cd5\u4e0d\u9700\u8981\u58f0\u660e\uff0c\u4f7f\u7528&#8221;\u5bf9\u8c61.\u65b9\u6cd5\u540d()&#8221;\u7684\u65b9\u5f0f\u5c31\u53ef\u4ee5\u8c03\u7528\uff0c\u65b9\u6cd5\u7528\u6765\u63cf\u8ff0\u8be5\u5bf9\u8c61\u7684\u884c\u4e3a\u548c\u529f\u80fd\u3002 <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u2463\u51fd\u6570<\/code><\/span><span class=\"md-plain\">:\u5355\u72ec\u5b58\u5728\u7684\uff0c\u901a\u8fc7&#8221;\u51fd\u6570\u540d()&#8221;\u7684\u65b9\u5f0f\u5c31\u53ef\u4ee5\u8c03\u7528\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  console.log(star.name)     \/\/ \u8c03\u7528\u540d\u5b57\u5c5e\u6027\r\n  console.log(star['name'])  \/\/ \u8c03\u7528\u540d\u5b57\u5c5e\u6027\r\n  \r\n  star.sayHi();<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u300c2. \u5229\u7528new Object\u521b\u5efa\u5bf9\u8c61\u300d<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u521b\u5efa\u7a7a\u5bf9\u8c61<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \u901a\u8fc7\u5185\u7f6e\u6784\u9020\u51fd\u6570Object\u521b\u5efa\u5bf9\u8c61\uff0c\u6b64\u65f6andy\u53d8\u91cf\u5df2\u7ecf\u4fdd\u5b58\u4e86\u521b\u5efa\u51fa\u6765\u7684\u7a7a\u5bf9\u8c61\r\n  var andy = new Object();<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7ed9\u7a7a\u5bf9\u8c61\u6dfb\u52a0\u5c5e\u6027\u548c\u65b9\u6cd5<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \u901a\u8fc7\u5bf9\u8c61\u64cd\u4f5c\u5c5e\u6027\u548c\u65b9\u6cd5\u7684\u65b9\u5f0f\uff0c\u6765\u4e3a\u5bf9\u8c61\u589e\u52a0\u5c5e\u6027\u548c\u65b9\u6cd5\r\n  andy.name = 'pink';\r\n  andy.age = 18; \/\/ andy.age = 19\u4fee\u6539\u5bf9\u8c61\u5c5e\u6027\r\n  andy.sex = '\u7537\uff1b\/\/ andy.phoneNum = 110 \u6dfb\u52a0\u5c5e\u6027\r\n  andy.sayHi = function() {\r\n    alert('\u5927\u5bb6\u597d');\r\n  }\r\n  obj.sayHi();\u8c03\u7528\u5bf9\u8c61\u7684\u65b9\u6cd5 \/\/\u7b2c\u4e8c\u79cd\u5199\u6cd5 obj['sayHi']();\r\n  \r\n  \/\/ Object()\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u5927\u5199\uff1b\r\n  \/\/new Object() \u9700\u8981new\u5173\u952e\u5b57\uff0c\u4f7f\u7528\u7684\u683c\u5f0f:\u5bf9\u8c61.\u5c5e\u6027 = \u503c<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">3. \u5229\u7528\u6784\u9020\u51fd\u6570\u521b\u5efa\u5bf9\u8c61<\/span><\/strong><\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u6784\u9020\u51fd\u6570<\/code><\/span><span class=\"md-plain\">\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u51fd\u6570\uff0c\u4e3b\u8981\u7528\u6765\u521d\u59cb\u5316\u5bf9\u8c61\uff0c\u5373\u4e3a\u5bf9\u8c61\u6210\u5458\u53d8\u91cf\u8d4b\u521d\u59cb\u503c,\u5b83\u603b\u4e0enew\u8fd0\u7b97\u7b26\u4e00\u8d77\u4f7f\u7528\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u5bf9\u8c61\u4e2d\u4e00\u4e9b\u516c\u5171\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u62bd\u51fa\u6765\uff0c\u7136\u540e\u5c01\u88c5\u5230\u8fd9\u4e2a\u51fd\u6570\u91cc\u9762\u3002<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6784\u9020\u51fd\u6570\u7684\u5c01\u88c5\u683c\u5f0f\uff1a<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  function \u6784\u9020\u51fd\u6570\u540d(\u5f62\u53c21\uff0c\u5f62\u53c22\uff0c\u5f62\u53c23...) {\r\n    this.\u5c5e\u6027\u540d1 = \u53c2\u65701;\r\n    this.\u5c5e\u6027\u540d2 = \u53c2\u65702;\r\n    this.\u5c5e\u6027\u540d3 = \u53c2\u65703;\r\n    this.\u65b9\u6cd5\u540d = \u51fd\u6570\u4f53;\r\n  }<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6784\u9020\u51fd\u6570\u7684\u8c03\u7528\u683c\u5f0f<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  var obj = new \u6784\u9020\u51fd\u6570\u540d(\u5b9e\u53c21\uff0c\u5b9e\u53c22\uff0c\u5b9e\u53c23);\r\n  \/\/ \u4ee5\u4e0a\u4ee3\u7801\u4e2d\uff0cobj\u5373\u63a5\u6536\u5230\u6784\u9020\u51fd\u6570\u521b\u5efa\u51fa\u6765\u7684\u5bf9\u8c61\u3002\r\n  \u6ce8\u610f\u4e8b\u9879\uff1a\r\n    1.\u6784\u9020\u51fd\u6570\u7ea6\u5b9a\u9996\u5b57\u6bcd\u5927\u5199\r\n    2.\u51fd\u6570\u5185\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u524d\u9762\u9700\u8981\u6dfb\u52a0this\uff0c\u8868\u793a\u5f53\u524d\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\r\n    3.\u6784\u9020\u51fd\u6570\u4e2d\u4e0d\u9700\u8981retrun\u8fd4\u56de\u7ed3\u679c\r\n    4.\u4f46\u6211\u4eec\u521b\u5efa\u5bf9\u8c61\u7684\u65f6\u5019\uff0c\u5fc5\u987b\u7528new \u6765\u8c03\u7528\u6784\u9020\u51fd\u6570\r\n    \r\n    1.\u5176\u4ed6\uff1a\u6784\u9020\u51fd\u6570\u5982Stars(),\u62bd\u53d6\u4e86\u5bf9\u8c61\u7684\u516c\u5171\u90e8\u5206\uff0c\u5c01\u88c5\u5230\u4e86\u51fd\u6570\u91cc\u9762\uff0c\u5b83\r\n     \u6cdb\u6307\u67d0\u4e00\u5927\u7c7b(class)\r\n    2.\u521b\u5efa\u5bf9\u8c61\uff0c\u5982new Stars();\u7279\u6307\u67d0\u4e00\u4e2a\uff0c\u5229\u7528new\u5173\u952e\u5b57\u521b\u5efa\u5bf9\u8c61\u7684\u8fc7\u7a0b\r\n     \u6211\u4eec\u4e5f\u79f0\u4e3a\u5bf9\u8c61\u5b9e\u4f8b\u5316<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">new\u5173\u952e\u5b57\u7684\u4f5c\u7528(\u9762\u8bd5\u9898)<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">1.\u5728\u6784\u9020\u51fd\u6570\u4ee3\u7801\u5f00\u59cb\u6267\u884c\u4e4b\u524d\uff0c\u521b\u5efa\u4e00\u4e2a\u7a7a\u5bf9\u8c61\uff1b<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">2.\u4fee\u6539this\u7684\u6307\u5411\uff0c\u628athis\u6307\u5411\u521b\u5efa\u51fa\u6765\u7684\u7a7a\u5bf9\u8c61\uff1b<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">3.\u6267\u884c\u6784\u9020\u51fd\u6570\u5185\u7684\u4ee3\u7801\uff0c\u7ed9\u8fd9\u4e2a\u65b0\u5bf9\u8c61\u6dfb\u52a0\u5c5e\u6027\u548c\u65b9\u6cd5<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">4.\u5728\u51fd\u6570\u5b8c\u6210\u4e4b\u540e\uff0c\u8fd4\u56de\u8fd9\u4e2a\u521b\u5efa\u51fa\u6765\u7684\u65b0\u5bf9\u8c61(\u6240\u4ee5\u6784\u9020\u51fd\u6570\u91cc\u9762\u4e0d\u9700\u8981return)<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/ \u5de5\u5382\u51fd\u6570\u521b\u5efa\u5bf9\u8c61 \u8fd9\u4e2a\u628a\u521b\u5efa\u597d\u7684\u5bf9\u8c61\u8fd4\u56de\u7ed9\u51fd\u6570\u8c03\u7528\u5904\r\n  function createPerson(name, age, job) {\r\n    var person = new Object();\r\n    person.name = name;\r\n    person.age = age;\r\n    person.job = job;\r\n    person.sayHi = function(){\r\n      console.log('Hello,everyBody');\r\n    }\r\n    return person;\r\n    }\r\n  var p1 = createPerson('\u5f20\u4e09', 22, 'actor');<\/pre>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u904d\u5386\u5bf9\u8c61<\/span><\/h3>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  for...in \u8bed\u53e5\u7528\u4e8e\u5bf9\u6570\u7ec4\u6216\u8005\u5bf9\u8c61\u7684\u5c5e\u6027\u8fdb\u884c\u5faa\u73af\u64cd\u4f5c\u3002\r\n\r\n  \u5176\u8bed\u6cd5\u5982\u4e0b\uff1a\r\n  for (\u53d8\u91cf in \u5bf9\u8c61\u540d\u5b57) {\r\n      \/\/ \u5728\u6b64\u6267\u884c\u4ee3\u7801\r\n  }\r\n  \u8bed\u6cd5\u4e2d\u7684\u53d8\u91cf\u662f\u81ea\u5b9a\u4e49\u7684\uff0c\u5b83\u9700\u8981\u7b26\u5408\u547d\u540d\u89c4\u8303\uff0c\u901a\u5e38\u6211\u4eec\u4f1a\u5c06\u8fd9\u4e2a\u53d8\u91cf\u5199\u4e3a k \u6216\u8005 key\u3002\r\n  \r\n  for (var k in obj) {\r\n    console.log(k);      \/\/ \u8fd9\u91cc\u7684 k \u662f\u5c5e\u6027\u540d\r\n    console.log(obj[k]); \/\/ \u8fd9\u91cc\u7684 obj[k] \u662f\u5c5e\u6027\u503c\r\n}<\/pre>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u4e5d\u3001\u5185\u7f6e\u5bf9\u8c61<\/span><\/h2>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5185\u7f6e\u5bf9\u8c61<\/span><\/strong><\/span><span class=\"md-plain\">JavaScript \u4e2d\u7684\u5bf9\u8c61\u5206\u4e3a3\u79cd\uff1a\u81ea\u5b9a\u4e49\u5bf9\u8c61 \u3001\u5185\u7f6e\u5bf9\u8c61\u3001 \u6d4f\u89c8\u5668\u5bf9\u8c61 \u524d\u9762\u4e24\u79cd\u5bf9\u8c61\u662fJS\u57fa\u7840\u5185\u5bb9\uff0c\u5c5e\u4e8eECMAScript;\u7b2c\u4e09\u4e2a\u6d4f\u89c8\u5668\u5bf9\u8c61\u5c5e\u4e8eJS\u72ec\u6709\u7684\uff0cJS API\u8bb2\u89e3\u5185\u7f6e\u5bf9\u8c61\u5c31\u662f\u6307js\u8bed\u8a00\u81ea\u5e26\u7684\u4e00\u4e9b\u5bf9\u8c61\uff0c\u8fd9\u4e9b\u5bf9\u8c61\u4f9b\u5f00\u53d1\u8005\u4f7f\u7528\uff0c\u5e76\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5e38\u7528\u7684\u6216\u662f\u6700\u57fa\u672c\u800c\u975e\u5fc5\u8981\u7684\u529f\u80fd(\u5c5e\u6027\u548c\u65b9\u6cd5),\u5185\u7f6e\u5bf9\u8c61\u6700\u5927\u7684\u4f18\u70b9\u5c31\u662f\u5e2e\u52a9\u6211\u4eec\u5feb\u901f\u5f00\u53d1\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u67e5\u6587\u6863<\/span><\/strong><\/span><span class=\"md-plain\">\u5b66\u4e60\u4e00\u4e2a\u5185\u7f6e\u5bf9\u8c61\u7684\u4f7f\u7528\uff0c\u53ea\u8981\u5b66\u4f1a\u5176\u5e38\u7528\u6210\u5458\u7684\u4f7f\u7528\u5373\u53ef\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u67e5\u6587\u6863\u5b66\u4e60\u3002 <\/span><span class=\"md-pair-s \"><strong><span class=\"md-plain\">MDN:<\/span><\/strong><\/span><span class=\"md-link md-pair-s\" spellcheck=\"false\"><a href=\"https:\/\/developer.mozilla.org\/zh-CN\/\">https:\/\/developer.mozilla.org\/zh-CN\/<\/a><\/span><\/p>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">Math\u5bf9\u8c61<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">Math\u5bf9\u8c61<\/span><\/strong><\/span><span class=\"md-plain\">\u4e0d\u662f\u6784\u9020\u51fd\u6570\uff0c\u5b83\u5177\u6709\u6570\u5b66\u5e38\u6570\u548c\u51fd\u6570\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u8ddf\u6570\u5b66\u76f8\u5173\u3002<\/span><\/p>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u5c5e\u6027\u3001\u65b9\u6cd5\u540d<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u529f\u80fd<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Math.PI<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5706\u5468\u7387<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Math.floor()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5411\u4e0b\u53d6\u6574<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Math.ceil()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5411\u4e0a\u53d6\u6574<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Math.round()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u56db\u820d\u4e94\u5165\u7248 \u5c31\u8fd1\u53d6\u6574 \u6ce8\u610f -3.5 \u7ed3\u679c\u662f -3<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Math.abs()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u7edd\u5bf9\u503c<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Math.max()\/Math.min()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u6c42\u6700\u5927\u548c\u6700\u5c0f\u503c<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">Math.random()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u83b7\u53d6\u8303\u56f4\u5728[0,1)\u5185\u7684\u968f\u673a\u503c<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\"> \u83b7\u53d6\u6307\u5b9a\u8303\u56f4\u7684\u968f\u673a\u6574\u6570\r\n  function getRandom(min, max) {\r\n    return Math.floor(Math.random() * (max - min + 1)) + min; \r\n  }<\/pre>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u65e5\u671f\u5bf9\u8c61<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\"> Date \u5bf9\u8c61\u548c Math \u5bf9\u8c61\u4e0d\u4e00\u6837\uff0cDate\u662f\u4e00\u4e2a\u6784\u9020\u51fd\u6570\uff0c\u6240\u4ee5\u4f7f\u7528\u65f6\u9700\u8981\u5b9e\u4f8b\u5316\u540e\u624d\u80fd\u4f7f\u7528\u5176\u4e2d\u5177\u4f53\u65b9\u6cd5\u548c\u5c5e\u6027\u3002Date \u5b9e\u4f8b\u7528\u6765\u5904\u7406\u65e5\u671f\u548c\u65f6\u95f4<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u4f7f\u7528Date\u5b9e\u4f8b\u5316\u65e5\u671f\u5bf9\u8c61<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u5fc5\u987b\u5b9e\u4f8b\u5316<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u83b7\u53d6\u6307\u5b9a\u65f6\u95f4\u7684\u65e5\u671f\u5bf9\u8c61<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  var now = new Date();\r\n  var future = new Date('2020\/10\/1')\r\n  \/\/ \u6ce8\u610f\uff1a\u5982\u679c\u521b\u5efa\u5b9e\u4f8b\u65f6\u5e76\u672a\u4f20\u5165\u53c2\u6570\uff0c\u5219\u5f97\u5230\u7684\u65e5\u671f\u5bf9\u8c61\u662f\u5f53\u524d\u65f6\u95f4\u5bf9\u5e94\u7684\u65e5\u671f\u5bf9\u8c61<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7eed\u4e0a<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u4f7f\u7528Date\u5b9e\u4f8b\u7684\u65b9\u6cd5\u548c\u5c5e\u6027<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">getMonth()\u65b9\u6cd5\u83b7\u53d6\u5230\u7684\u6708\u4efd + 1 = \u5f53\u6708<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u65b9\u6cd5\u540d<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u4ee3\u7801<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">getFullYear()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u83b7\u53d6\u5f53\u5e74<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">dObj.getFullYear()<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">getMonth()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u83b7\u53d6\u5f53\u6708\uff080-11\uff09<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">dObj.getMonth()<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">getDate()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u83b7\u53d6\u5f53\u5929\u65e5\u671f<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">dObj.getDate()<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">getDay()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u83b7\u53d6\u661f\u671f\u51e0\uff08\u5468\u65e50-\u5468\u516d6\uff09<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">dObj.getDay()<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">getHours()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u83b7\u53d6\u5f53\u524d\u5c0f\u65f6<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">dObj.getHours()<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">getMinutes()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u83b7\u53d6\u5f53\u524d\u5206\u949f<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">dObj.getMinutes()<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">getSeconds()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u83b7\u53d6\u5f53\u524d\u79d2\u949f<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">dObj.getSeconds()<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/\u53c2\u6570\u5e38\u7528\u5199\u6cd5 \u6570\u5b57\u578b\u6216\u8005\u5b57\u7b26\u4e32\u578b '2019-10-1 8:8:8'\r\n  var date1 = new Date(2019,10,1);\r\n  \/\/\u65e5\u671f\u683c\u5f0f\u5316\r\n        \/\/ \u683c\u5f0f\u5316\u65e5\u671f \u5e74 \u6708 \u65e5\r\n      var date = new Date();\r\n      console.log(date.getFullYear()); \/\/\u8fd4\u56de\u5f53\u524d\u65e5\u671f\u7684\u5e74 2020\r\n      console.log(date.getMonth() + 1); \/\/\u6708\u4efd \u8fd4\u56de\u7684\u6708\u4efd\u5c0f1\u4e2a\u6708\uff0c\u8bb0\u5f97\u6708\u4efd\u52a01\u5466\r\n      console.log(date.getDate()); \/\/\u8fd4\u56de\u7684\u662f \u51e0\u53f7\r\n      console.log(date.getDay); \/\/\u5468\u4e00\u8fd4\u56de\u7684\u662f1 \u5468\u516d\u8fd4\u56de\u7684\u662f6 \u5468\u65e5\u8fd4\u56de\u7684\u662f0\r\n      \/\/\u6211\u4eec\u5199\u4e00\u4e2a 2020\u5e74 9\u6708 6\u65e5 \u661f\u671f\u65e5\r\n      var year = date.getFullYear();\r\n      var month = date.getMonth() + 1;\r\n      var dates = date.getDate();\r\n      var day = date.getDay();\r\n      if (day == 0) {\r\n        day = \"\u661f\u671f\u65e5\";\r\n      }\r\n      console.log(\"\u4eca\u5929\u662f\" + year + \"\u5e74\" + month + \"\u6708\" + dates + \"\u65e5\" + day);\r\n      \/\/\u683c\u5f0f\u5316\u65e5\u671f \u65f6\u5206\u79d2\r\n      var date = new Date();\r\n      console.log(date.getHours()); \/\/\u65f6\r\n      console.log(date.getMinutes()); \/\/\u5206\r\n      console.log(date.getSeconds()); \/\/ \u79d2\r\n\r\n      \/\/\u5c01\u88c5\u4e00\u4e2a\u51fd\u6570\u8fd4\u56de\u5f53\u524d\u7684 \u65f6 \u5206 \u79d2 \u683c\u5f0f 08:08:08\r\n      function getTimer() {\r\n        var time = new Date();\r\n        var h = time.getHours();\r\n        var h = h &lt; 10 ? \"0\" + h : h;\r\n\r\n        var m = time.getMinutes();\r\n        var m = m &lt; 10 ? \"0\" + m : m;\r\n\r\n        var s = time.getSeconds();\r\n        var s = s &lt; 10 ? \"0\" + s : s;\r\n        return h + \":\" + h + \":\" + s;\r\n      }\r\n      console.log(getTimer());<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u83b7\u53d6Date\u65e5\u671f\u603b\u7684\u6beb\u79d2\u6570(\u65f6\u95f4\u6233)<\/code><\/span><span class=\"md-plain\"> \u57fa\u4e8e1970\u5e741\u67081\u65e5(\u4e16\u754c\u6807\u51c6\u4e16\u754c)\u8d77\u7684\u6beb\u79d2\u6570<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/ \u5b9e\u4f8b\u5316Date\u5bf9\u8c61\r\n  var now = new Date();\r\n  \/\/ 1. \u7528\u4e8e\u83b7\u53d6\u5bf9\u8c61\u7684\u539f\u59cb\u503c\r\n  console.log(now.valueOf()) \r\n  console.log(now.getTime()) \r\n  \/\/ 2. \u7b80\u5355\u5199\u53ef\u4ee5\u8fd9\u4e48\u505a (\u6700\u5e38\u7528\u7684)\r\n  var now = + new Date();   \r\n  \/\/ 3. HTML5\u4e2d\u63d0\u4f9b\u7684\u65b9\u6cd5\uff0c\u6709\u517c\u5bb9\u6027\u95ee\u9898\r\n  var now = Date.now();\r\n \u5012\u8ba1\u65f6\u6848\u4f8b \uff1a\r\n  1. \u8f93\u5165\u7684\u65f6\u95f4\u51cf\u53bb\u73b0\u5728\u7684\u65f6\u95f4\u5c31\u662f\u5269\u4f59\u7684\u65f6\u95f4\uff0c\u5373\u5012\u8ba1\u65f6\u3002\r\n  2.\u7528\u65f6\u95f4\u6233\u6765\u505a\uff0c\u7528\u6237\u8f93\u5165\u65f6\u95f4\u603b\u7684\u6beb\u79d2\u6570\u51cf\u53bb\u73b0\u5728\u65f6\u95f4\u7684\u603b\u7684\u6beb\u79d2\u6570\uff0c\r\n   \u5f97\u5230\u7684\u5c31\u662f\u5269\u4f59\u65f6\u95f4\u7684\u6beb\u79d2\u6570\r\n  3.\u628a\u5269\u4f59\u65f6\u95f4\u603b\u7684\u6beb\u79d2\u6570\u8f6c\u6362\u4e3a\u5929\u3001\u65f6\u3001\u5206\u3001\u79d2  (\u65f6\u95f4\u6233\u8f6c\u6362\u65f6\u5206\u79d2)\r\n    \u8f6c\u6362\u516c\u5f0f\u5982\u4e0b\uff1a\r\n    d = parseInt(\u603b\u79d2\u6570\/60\/60\/24) \/\/ \u8ba1\u7b97\u5929\u6570\r\n    h = parseInt(\u603b\u79d2\u6570\/60\/60%24) \/\/ \u8ba1\u7b97\u5c0f\u65f6\r\n    m = parseInt(\u603b\u79d2\u6570\/60%60);   \/\/ \u8ba1\u7b97\u5206\u949f  \r\n    s = parseInt(\u603b\u79d2\u6570%60);      \/\/ \u8ba1\u7b97\u5f53\u524d\u79d2\u6570\r\n      \/\/ \u5012\u8ba1\u65f6\u6848\u4f8b \u5c01\u88c5\u51fd\u6570\u5b9e\u73b0\r\n      function countDown(time) {\r\n        var nowTime = +new Date(); \/\/ \u8fd4\u56de\u7684\u662f\u5f53\u524d\u65f6\u95f4\u603b\u7684\u6beb\u79d2\u6570\r\n        var inputTime = +new Date(time); \/\/ \u8fd4\u56de\u7684\u662f\u7528\u6237\u8f93\u5165\u65f6\u95f4\u603b\u7684\u6beb\u79d2\u6570\r\n        var times = (inputTime - nowTime) \/ 1000; \/\/ times\u662f\u5269\u4f59\u65f6\u95f4\u603b\u7684\u79d2\u6570\r\n        var d = parseInt(times \/ 60 \/ 60 \/ 24); \/\/ \u5929\r\n        d = d &lt; 10 ? \"0\" + d : d;\r\n        var h = parseInt((times \/ 60 \/ 60) % 24); \/\/\u65f6\r\n        h = h &lt; 10 ? \"0\" + h : h;\r\n        var m = parseInt((times \/ 60) % 60); \/\/ \u5206\r\n        m = m &lt; 10 ? \"0\" + m : m;\r\n        var s = parseInt(times % 60); \/\/ \u5f53\u524d\u7684\u79d2\r\n        s = s &lt; 10 ? \"0\" + s : s;\r\n        return d + \"\u5929\" + h + \"\u65f6\" + m + \"\u5206\" + s + \"\u79d2\";\r\n      }\r\n      console.log(countDown(\"2020-10-1 18:00:00\"));\r\n      var date = new Date();\r\n      console.log(date);<\/pre>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u6570\u7ec4\u5bf9\u8c61<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u521b\u5efa\u6570\u7ec4\u7684\u4e24\u79cd\u65b9\u5f0f<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">1. \u5b57\u9762\u91cf\u65b9\u5f0f<\/span><\/strong><\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>var arr = [1,\"test\",true];<\/code><\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">2. \u5b9e\u4f8b\u5316\u6570\u7ec4\u5bf9\u8c61 new Array()<\/span><\/strong><\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>var arr = new Array();<\/code><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6ce8\u610f\uff1a\u4e0a\u9762\u4ee3\u7801\u4e2darr\u521b\u5efa\u51fa\u7684\u662f\u4e00\u4e2a\u7a7a\u6570\u7ec4\uff0c\u5982\u679c\u9700\u8981\u4f7f\u7528\u6784\u9020\u51fd\u6570Array\u521b\u5efa\u975e\u7a7a\u6570\u7ec4\uff0c\u53ef\u4ee5\u5728\u521b\u5efa\u6570\u7ec4\u65f6\u4f20\u5165\u53c2\u6570<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5982\u679c\u53ea\u4f20\u5165\u4e00\u4e2a\u53c2\u6570(\u6570\u5b57)\uff0c\u5219\u53c2\u6570\u89c4\u5b9a\u4e86\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5982\u679c\u4f20\u5165\u4e86\u591a\u4e2a\u53c2\u6570\uff0c\u5219\u53c2\u6570\u79f0\u4e3a\u6570\u7ec4\u7684\u5143\u7d20\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u68c0\u6d4b\u662f\u5426\u4e3a\u6570\u7ec4<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">1. instanceof \u8fd0\u7b97\u7b26<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">instanceof \u53ef\u4ee5\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u662f\u67d0\u4e2a\u6784\u9020\u51fd\u6570\u7684\u5b9e\u4f8b<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  var arr = [1, 23];\r\n  var obj = {};\r\n  console.log(arr instanceof Array); \/\/ true\r\n  console.log(obj instanceof Array); \/\/ false<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">2. Array.isArray()<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">Array.isArray()\u7528\u4e8e\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u4e3a\u6570\u7ec4\uff0cisArray() \u662f HTML5 \u4e2d\u63d0\u4f9b\u7684\u65b9\u6cd5<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  var arr = [1, 23];\r\n  var obj = {};\r\n  console.log(Array.isArray(arr));   \/\/ true\r\n  console.log(Array.isArray(obj));   \/\/ false<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">3. \u6ce8\u610f typeof\u7528\u6cd5<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">typeof \u7528\u4e8e\u5224\u65ad\u53d8\u91cf\u7684\u7c7b\u578b<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  var arr = [1, 23];\r\n  console.log(typeof arr) \/\/ object \u5bf9\u8c61arr\u662f\u6784\u9020\u51fd\u6570\u7684\u5b9e\u4f8b\u56e0\u6b64\u662f\u5bf9\u8c61\u6570\u636e\u7c7b\u578b<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6dfb\u52a0\u5220\u9664\u6570\u7ec4\u5143\u7d20\u7684\u65b9\u6cd5<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6570\u7ec4\u4e2d\u6709\u8fdb\u884c\u589e\u52a0\u3001\u5220\u9664\u5143\u7d20\u7684\u65b9\u6cd5\uff0c\u90e8\u5206\u65b9\u6cd5\u5982\u4e0b\u8868<\/span><\/p>\n<\/li>\n<\/ul>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u65b9\u6cd5\u540d<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8fd4\u56de\u503c<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">push(\u53c2\u65701&#8230;)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u672b\u5c3e\u6dfb\u52a0\u4e00\u4e2a\u6216\u591a\u4e2a\u5143\u7d20\uff0c\u4fee\u6539\u539f\u6570\u7ec4<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8fd4\u56de\u65b0\u957f\u5ea6<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">pop()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5220\u9664\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff0c\u6570\u7ec4\u957f\u5ea6\u51cf\u4e00\uff0c\u65e0\u53c2\u6570\u4fee\u6539\u539f\u6570\u7ec4<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8fd4\u56de\u5b83\u5220\u9664\u7684\u5143\u7d20\u7684\u503c<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">unshift(\u53c2\u65701&#8230;)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u6570\u7ec4\u5f00\u5934\u589e\u52a0\u4e00\u4e2a\u6216\u591a\u4e2a\u5143\u7d20\uff0c\u4fee\u6539\u539f\u6570\u7ec4<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8fd4\u56de\u65b0\u957f\u5ea6<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">shift()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5220\u9664\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0c\u6570\u7ec4\u957f\u5ea6\u51cf\u4e00\uff0c\u65e0\u53c2\u6570\u4fee\u6539\u539f\u6570\u7ec4<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8fd4\u56de\u7b2c\u4e00\u4e2a\u5143\u7d20\u7684\u503c<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">      var arr = [1, 2, 3];\r\n      console.log(arr.push(4, 5)); \/\/ 5 \u5411\u6570\u7ec4\u672b\u5c3e\u6dfb\u52a0\u5143\u7d20\r\n      arr.pop(); \/\/\u5220\u9664\u6570\u7ec4\u6700\u540e\u4e00\u4e2a\u503c\u5e76\u8fd4\u56de\r\n      console.log(arr); \/\/ [1,2,3,4]\r\n      \r\n      \/\/ \u5411\u6570\u7ec4\u7684\u5f00\u5934\u6dfb\u52a0\u5143\u7d20\u5e76\u8fd4\u56de\u6570\u7ec4\u957f\u5ea6 \r\n      console.log(arr.unshift(5, 6)); \/\/ 6  \u6570\u7ec4\u53d8\u4e3a[5,6,1,2,3,4]\r\n      console.log(arr.shift()); \/\/ 5 \u5220\u9664\u6570\u7ec4\u5f00\u5934\u7684\u5143\u7d20\u5e76\u8fd4\u56de\u8be5\u503c<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6570\u7ec4\u6392\u5e8f<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6570\u7ec4\u4e2d\u6709\u5bf9\u6570\u7ec4\u672c\u8eab\u6392\u5e8f\u7684\u65b9\u6cd5\uff0c\u90e8\u5206\u65b9\u6cd5\u5982\u4e0b\u8868<\/span><\/p>\n<\/li>\n<\/ul>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u65b9\u6cd5\u540d<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u662f\u5426\u4fee\u6539\u539f\u6570\u7ec4<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">reverse()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u98a0\u5012\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u987a\u5e8f\uff0c\u65e0\u53c2\u6570<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8be5\u65b9\u6cd5\u4f1a\u6539\u53d8\u539f\u6765\u7684\u6570\u7ec4 \u8fd4\u56de\u65b0\u6570\u7ec4<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">sort()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5bf9\u6570\u7ec4\u7684\u5143\u7d20\u8fdb\u884c\u6392\u5e8f<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8be5\u65b9\u6cd5\u4f1a\u6539\u53d8\u539f\u6765\u7684\u6570\u7ec4 \u8fd4\u56de\u65b0\u6570\u7ec4<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6ce8\u610f\uff1a<\/span><span class=\"md-pair-s \"><strong><span class=\"md-plain\">sort\u65b9\u6cd5\u9700\u8981\u4f20\u5165\u53c2\u6570(\u51fd\u6570)\u6765\u8bbe\u7f6e\u5347\u5e8f\u3001\u964d\u5e8f\u6392\u5e8f<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5982\u679c\u4f20\u5165\u201cfunction(a,b){ return a-b;}\u201d\uff0c\u5219\u4e3a\u5347\u5e8f<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5982\u679c\u4f20\u5165\u201cfunction(a,b){ return b-a;}\u201d\uff0c\u5219\u4e3a\u964d\u5e8f<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">     \/\/ \u8e29\u5751 \u6570\u7ec4sort()\u6392\u5e8f(\u5192\u6ce1\u6392\u5e8f) return a - b \u5219\u5347\u5e8f\r\n     \/\/ \u5199\u6cd5\u56fa\u5b9a \u53c2\u8003\u5982\u4e0b\r\n     var arr1 = [13,4,77,1,7];\r\n     arr1.sort(function(a,b){\r\n       return a-b;\r\n     });\r\n     console.log(arr1);<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6570\u7ec4\u7d22\u5f15\u65b9\u6cd5<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6570\u7ec4\u4e2d\u6709\u83b7\u53d6\u6570\u7ec4\u6307\u5b9a\u5143\u7d20\u7d22\u5f15\u503c\u7684\u65b9\u6cd5\uff0c\u90e8\u5206\u65b9\u6cd5\u5982\u4e0b\u8868<\/span><\/p>\n<\/li>\n<\/ul>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u65b9\u6cd5\u540d<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8fd4\u56de\u503c<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">indexOf()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u6570\u7ec4\u4e2d\u67e5\u627e\u7ed9\u5b9a\u7684\u7b2c\u4e00\u4e2a\u7d22\u5f15<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5b58\u5728\u8fd4\u56de\u7d22\u5f15\u53f7\uff0c\u4e0d\u5b58\u5728\u5219\u8fd4\u56de-1<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">lastIndexOf()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u6570\u7ec4\u4e2d\u6700\u540e\u4e00\u4e2a\u7d22\u5f15<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5b58\u5728\u8fd4\u56de\u7d22\u5f15\u53f7\uff0c\u4e0d\u5b58\u5728\u5219\u8fd4\u56de-1<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">    var arr = [1, 2, 3, 4, 5, 4, 1, 2];\r\n    \/\/ \u67e5\u627e\u5143\u7d202\u7684\u7d22\u5f15\r\n    console.log(arr.indexOf(2)); \/\/ 1\r\n    \/\/ \u67e5\u627e\u5143\u7d201\u5728\u6570\u7ec4\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u7d22\u5f15\r\n    console.log(arr.lastIndexOf(1)); \/\/ 6<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u300c\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u300d<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6570\u7ec4\u4e2d\u6709\u628a\u6570\u7ec4\u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5\uff0c\u90e8\u5206\u65b9\u6cd5\u5982\u4e0b\u8868<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6ce8\u610f\uff1ajoin\u65b9\u6cd5\u5982\u679c\u4e0d\u4f20\u5165\u53c2\u6570\uff0c\u5219\u6309\u7167 \u201c , \u201d\u62fc\u63a5\u5143\u7d20!<\/span><\/p>\n<\/li>\n<\/ul>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u65b9\u6cd5\u540d<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8fd4\u56de\u503c<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">toString()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u628a\u6570\u7ec4\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\uff0c\u9017\u53f7\u5206\u9694\u6bcf\u4e00\u9879<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">join(&#8216;\u5206\u9694\u7b26&#8217;)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u7528\u4e8e\u5427\u6570\u7ec4\u4e2d\u6240\u6709\u5143\u7d20\u8f6c\u6362\u6210\u4e3a\u4e00\u4e2a\u5b57\u7b26\u4e32<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">    var arr = [1, 2, 3, 4];\r\n    var arr2 = arr;\r\n    var str = arr.toString(); \/\/ \u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\r\n    console.log(str); \/\/ 1,2,3,4\r\n      \r\n    var str2 = arr2.join(\"|\");\/\/\u6309\u7167\u952e\u5165\u5b57\u7b26\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\r\n    console.log(str2);<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u300c\u5176\u4ed6\u65b9\u6cd5\u300d<\/span><\/strong><\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">    var arr = [1, 2, 3, 4];\r\n    var arr2 = [5, 6, 7, 8];\r\n    var arr3 = arr.concat(arr2);\r\n    console.log(arr3); \/\/ [1,2,3,4,5,6,7,8]\r\n\r\n    \/\/ slice(begin,end) \u662f\u4e00\u79cd\u5de6\u95ed\u53f3\u5f00\u533a\u95f4 [1,3)\r\n    \/\/ \u4ece\u7d22\u5f151\u51fa\u5f00\u59cb\u622a\u53d6\uff0c\u5230\u7d22\u5f153\u4e4b\u524d\r\n    var arr4 = arr.slice(1, 3);\r\n    console.log(arr4); \/\/ [2,3]\r\n\r\n    var arr5 = arr2.splice(0, 3);\r\n    console.log(arr5); \/\/ [5,6,7]\r\n    console.log(arr2); \/\/ [8]   splice()\u4f1a\u5f71\u54cd\u539f\u6570\u7ec4<\/pre>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u5b57\u7b26\u4e32\u5bf9\u8c61<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u57fa\u672c\u5305\u88c5\u7c7b\u578b<\/span><\/strong><\/span><span class=\"md-plain\">\u4e3a\u4e86\u65b9\u4fbf\u64cd\u4f5c\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0cJavaScript \u8fd8\u63d0\u4f9b\u4e86\u4e09\u4e2a\u7279\u6b8a\u7684\u5f15\u7528\u7c7b\u578b\uff1aString\u3001Number\u548c Boolean\u3002 <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u5c31\u662f\u628a\u7b80\u5355\u6570\u636e\u7c7b\u578b\u5305\u88c5\u6210\u4e3a\u590d\u6742\u6570\u636e\u7c7b\u578b<\/code><\/span><span class=\"md-plain\">\uff0c\u8fd9\u6837\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5c31\u6709\u4e86\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/ \u4e0b\u9762\u4ee3\u7801\u6709\u4ec0\u4e48\u95ee\u9898\uff1f\r\n  var str = 'andy';\r\n  console.log(str.length); \/\/ 4<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\"> \u6309\u9053\u7406\u57fa\u672c\u6570\u636e\u7c7b\u578b\u662f\u6ca1\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\u7684\uff0c\u800c\u5bf9\u8c61\u624d\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u4f46\u4e0a\u9762\u4ee3\u7801\u5374\u53ef\u4ee5\u6267\u884c\uff0c\u8fd9\u662f\u56e0\u4e3a js \u4f1a\u628a\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5305\u88c5\u4e3a\u590d\u6742\u6570\u636e\u7c7b\u578b\uff0c\u5176\u6267\u884c\u8fc7\u7a0b\u5982\u4e0b \uff1a<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  \/\/ 1. \u751f\u6210\u4e34\u65f6\u53d8\u91cf\uff0c\u628a\u7b80\u5355\u7c7b\u578b\u5305\u88c5\u4e3a\u590d\u6742\u6570\u636e\u7c7b\u578b\r\n  var temp = new String('andy');\r\n  \/\/ 2. \u8d4b\u503c\u7ed9\u6211\u4eec\u58f0\u660e\u7684\u5b57\u7b26\u53d8\u91cf\r\n  str = temp;\r\n  \/\/ 3. \u9500\u6bc1\u4e34\u65f6\u53d8\u91cf\r\n  temp = null;<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5b57\u7b26\u4e32\u7684\u4e0d\u53ef\u53d8<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6307\u7684\u662f\u91cc\u9762\u7684\u503c\u4e0d\u53ef\u53d8\uff0c\u867d\u7136\u770b\u4e0a\u53bb\u53ef\u4ee5\u6539\u53d8\u5185\u5bb9\uff0c\u4f46\u5176\u5b9e\u662f\u5730\u5740\u53d8\u4e86\uff0c\u5185\u5b58\u4e2d\u65b0\u5f00\u8f9f\u4e86\u4e00\u4e2a\u5185\u5b58\u7a7a\u95f4\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5f53\u91cd\u65b0\u7ed9\u5b57\u7b26\u4e32\u53d8\u91cf\u8d4b\u503c\u7684\u65f6\u5019\uff0c\u53d8\u91cf\u4e4b\u524d\u4fdd\u5b58\u7684\u5b57\u7b26\u4e32\u4e0d\u4f1a\u88ab\u4fee\u6539\uff0c\u4f9d\u7136\u5728\u5185\u5b58\u4e2d\u91cd\u65b0\u7ed9\u5b57\u7b26\u4e32\u8d4b\u503c\uff0c\u4f1a\u91cd\u65b0\u5728\u5185\u5b58\u4e2d\u5f00\u8f9f\u7a7a\u95f4\uff0c\u8fd9\u4e2a\u7279\u70b9\u5c31\u662f\u5b57\u7b26\u4e32\u7684\u4e0d\u53ef\u53d8\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7531\u4e8e\u5b57\u7b26\u4e32\u7684\u4e0d\u53ef\u53d8\uff0c\u5728<\/span><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5927\u91cf\u62fc\u63a5\u5b57\u7b26\u4e32<\/span><\/strong><\/span><span class=\"md-plain\">\u7684\u65f6\u5019\u4f1a\u6709\u6548\u7387\u95ee\u9898<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6839\u636e\u5b57\u7b26\u8fd4\u56de\u4f4d\u7f6e<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5b57\u7b26\u4e32\u901a\u8fc7\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u53ef\u4ee5\u8c03\u7528\u90e8\u5206\u65b9\u6cd5\u6765\u64cd\u4f5c\u5b57\u7b26\u4e32\uff0c\u4ee5\u4e0b\u662f\u8fd4\u56de\u6307\u5b9a\u5b57\u7b26\u7684\u4f4d\u7f6e\u7684\u65b9\u6cd5\uff1a<\/span><\/p>\n<\/li>\n<\/ul>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u65b9\u6cd5\u540d<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">indexOf(&#8216;\u8981\u67e5\u627e\u7684\u5b57\u7b26&#8217;\uff0c\u5f00\u59cb\u7684\u4f4d\u7f6e)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8fd4\u56de\u6307\u5b9a\u5185\u5bb9\u5728\u5143\u5b57\u7b26\u4e32\u4e2d\u7684\u4f4d\u7f6e\uff0c\u627e\u4e0d\u5230\u5c31\u8fd4\u56de-1\uff0c\u6700\u5f00\u59cb\u7684\u4f4d\u7f6e\u662findex\u7d22\u5f15\u53f7<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">lastIndexOf()<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u4ece\u540e\u5f80\u524d\u627e\uff0c\u53ea\u627e\u7b2c\u4e00\u4e2a\u5339\u914d\u7684<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">    var str = \"anndy\";\r\n    console.log(str.indexOf(\"d\")); \/\/ 3\r\n    \/\/\u6307\u5b9a\u4ece\u7d22\u5f15\u53f7\u4e3a4\u7684\u5730\u65b9\u5f00\u59cb\u67e5\u627e\u5b57\u7b26\"d\"\r\n    console.log(str.indexOf(\"d\", 4)); \/\/ -1\r\n    \r\n    console.log(str.lastIndexOf(\"n\")); \/\/ 2<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6848\u4f8b\uff1a\u67e5\u627e\u5b57\u7b26\u4e32&#8221;abcoefoxyozzopp&#8221;\u4e2d\u6240\u6709o\u51fa\u73b0\u7684\u4f4d\u7f6e\u4ee5\u53ca\u6b21\u6570<\/span><\/p>\n<ol class=\"ol-list\" start=\"\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5148\u67e5\u627e\u7b2c\u4e00\u4e2ao\u51fa\u73b0\u7684\u4f4d\u7f6e<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7136\u540e \u53ea\u8981indexOf \u8fd4\u56de\u7684\u7ed3\u679c\u4e0d\u662f -1 \u5c31\u7ee7\u7eed\u5f80\u540e\u67e5\u627e<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u56e0\u4e3aindexOf \u53ea\u80fd\u67e5\u627e\u5230\u7b2c\u4e00\u4e2a\uff0c\u6240\u4ee5\u540e\u9762\u7684\u67e5\u627e\uff0c\u5229\u7528\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u5f53\u524d\u7d22\u5f15\u52a01\uff0c\u4ece\u800c\u7ee7\u7eed\u67e5\u627e<\/span><\/p>\n<\/li>\n<\/ol>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">      var str = \"oabcoefoxyozzopp\";\r\n      var index = str.indexOf(\"o\");\r\n      var num = 0;\r\n      while (index !== -1) {\r\n        console.log(index);\r\n        num++;\r\n        index = str.indexOf(\"o\", index + 1);\r\n      }<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u6839\u636e\u4f4d\u7f6e\u8fd4\u56de\u5b57\u7b26<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5b57\u7b26\u4e32\u901a\u8fc7\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u53ef\u4ee5\u8c03\u7528\u90e8\u5206\u65b9\u6cd5\u6765\u64cd\u4f5c\u5b57\u7b26\u4e32\uff0c\u4ee5\u4e0b\u662f\u6839\u636e\u4f4d\u7f6e\u8fd4\u56de\u6307\u5b9a\u4f4d\u7f6e\u4e0a\u7684\u5b57\u7b26\uff1a<\/span><\/p>\n<\/li>\n<\/ul>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u65b9\u6cd5\u540d<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u4f7f\u7528<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">charAt(index)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u8fd4\u56de\u6307\u5b9a\u4f4d\u7f6e\u7684\u5b57\u7b26<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">str.charAt(0)<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">charCodeAt(idnex)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u83b7\u53d6\u6307\u5b9a\u4f4d\u7f6e\u5b57\u7b26\u7684ASCII\u7801<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">str.charCodeAt(0)<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">str(index)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u83b7\u53d6\u6307\u5b9a\u4f4d\u7f6e\u51fa\u5b57\u7b26<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">HTML5,IE8+\u652f\u6301\u548ccharAt()\u7b49\u6548<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">      \/\/ \u6839\u636e\u4f4d\u7f6e\u8fd4\u56de\u5b57\u7b26\r\n      \/\/ 1. charAt(index) \u6839\u636e\u4f4d\u7f6e\u8fd4\u56de\u5b57\u7b26\r\n      var str = 'andy';\r\n      console.log(str.charAt(3)); \/\/ y\r\n      \/\/ \u904d\u5386\u6240\u6709\u7684\u5b57\u7b26\r\n      for (var i = 0; i &lt; str.length; i++) {\r\n          console.log(str.charAt(i));\r\n      } \/\/ a n d y\r\n      \r\n      \/\/ 2. charCodeAt(index)  \r\n      \/\/\u8fd4\u56de\u76f8\u5e94\u7d22\u5f15\u53f7\u7684\u5b57\u7b26ASCII\u503c \u76ee\u7684\uff1a \u5224\u65ad\u7528\u6237\u6309\u4e0b\u4e86\u90a3\u4e2a\u952e \r\n      console.log(str.charCodeAt(0)); \/\/ 97\r\n      \/\/ 3. str[index] H5 \u65b0\u589e\u7684\r\n      console.log(str[0]); \/\/ a<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6848\u4f8b\uff1a\u5224\u65ad\u4e00\u4e2a\u5b57\u7b26\u4e32 &#8216;abcoefoxyozzopp&#8217; \u4e2d\u51fa\u73b0\u6b21\u6570\u6700\u591a\u7684\u5b57\u7b26\uff0c\u5e76\u7edf\u8ba1\u5176\u6b21\u6570<\/span><\/p>\n<ol class=\"ol-list\" start=\"\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6838\u5fc3\u7b97\u6cd5\uff1a\u5229\u7528 charAt(\uff09 \u904d\u5386\u8fd9\u4e2a\u5b57\u7b26\u4e32<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u628a\u6bcf\u4e2a\u5b57\u7b26\u90fd\u5b58\u50a8\u7ed9\u5bf9\u8c61\uff0c \u5982\u679c\u5bf9\u8c61\u6ca1\u6709\u8be5\u5c5e\u6027\uff0c\u5c31\u4e3a1\uff0c\u5982\u679c\u5b58\u5728\u4e86\u5c31 +1<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u904d\u5386\u5bf9\u8c61\uff0c\u5f97\u5230\u6700\u5927\u503c\u548c\u8be5\u5b57\u7b26 \u6ce8\u610f\uff1a\u5728\u904d\u5386\u7684\u8fc7\u7a0b\u4e2d\uff0c\u628a\u5b57\u7b26\u4e32\u4e2d\u7684\u6bcf\u4e2a\u5b57\u7b26\u4f5c\u4e3a\u5bf9\u8c61\u7684\u5c5e\u6027\u5b58\u50a8\u5728\u5bf9\u8c61\u4e2d\uff0c\u5bf9\u5e94\u7684\u5c5e\u6027\u503c\u662f\u8be5\u5b57\u7b26\u51fa\u73b0\u7684\u6b21\u6570<\/span><\/p>\n<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">      var str = \"abcoefoxyozzopp\";\r\n      var o = {};\r\n      for (var i = 0; i &lt; str.length; i++) {\r\n        var chars = str.charAt(i); \/\/ chars \u662f \u5b57\u7b26\u4e32\u7684\u6bcf\u4e00\u4e2a\u5b57\u7b26\r\n        if (o[chars]) {\r\n          \/\/ o[chars] \u5f97\u5230\u7684\u662f\u5c5e\u6027\u503c\r\n          o[chars]++;\r\n        } else {\r\n          o[chars] = 1;\r\n        }\r\n      }\r\n      console.log(o);\r\n      \/\/ 2. \u904d\u5386\u5bf9\u8c61\r\n      var max = 0;\r\n      var ch = \"\";\r\n      for (var k in o) {\r\n        \/\/ k \u5f97\u5230\u662f \u5c5e\u6027\u540d\r\n        \/\/ o[k] \u5f97\u5230\u7684\u662f\u5c5e\u6027\u503c\r\n        if (o[k] &gt; max) {\r\n          max = o[k];\r\n          ch = k;\r\n        }\r\n      }\r\n      console.log(max);\r\n      console.log(\"\u6700\u591a\u7684\u5b57\u7b26\u662f\" + ch);<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u5b57\u7b26\u4e32\u64cd\u4f5c\u65b9\u6cd5<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5b57\u7b26\u4e32\u901a\u8fc7\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u53ef\u4ee5\u8c03\u7528\u90e8\u5206\u65b9\u6cd5\u6765\u64cd\u4f5c\u5b57\u7b26\u4e32\uff0c\u4ee5\u4e0b\u662f\u90e8\u5206\u64cd\u4f5c\u65b9\u6cd5\uff1a<\/span><\/p>\n<\/li>\n<\/ul>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u65b9\u6cd5\u540d<\/span><\/span><\/th>\n<th><span class=\"td-span\"><span class=\"md-plain\">\u8bf4\u660e<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">concat(str1,str2,str3&#8230;)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u7528\u4e8e\u8fde\u63a5\u4e24\u4e2a\u6216\u591a\u4e2a\u5b57\u7b26\u4e32\u3002\u62fc\u63a5\u5b57\u7b26\u4e32\uff0c\u7b49\u6548\u4e8e+\uff0c+\u66f4\u5e38\u7528<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">substr(start,length)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u4ecestart\u5f00\u59cbnlength\u53d6\u7684\u4e2a\u6570\uff0c\u91cd\u70b9\u8bb0\u8fd9\u4e2a<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">slice(start,end)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u4ecestart\u4f4d\u7f6e\u5f00\u59cb\uff0c\u622a\u53d6\u5230end\u4f4d\u7f6e\uff0cend\u53d6\u4e0d\u5230<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">substring(start,end)<\/span><\/span><\/td>\n<td><span class=\"td-span\"><span class=\"md-plain\">\u4ecestart\u4f4d\u7f6e\u5f00\u59cb\uff0c\u622a\u53d6\u5230end\u4f4d\u7f6e\uff0cend\u53d6\u4e0d\u5230\uff0c\u57fa\u672c\u548cslice\u76f8\u540c\u4f46\u662f\u4e0d\u63a5\u53d7\u8d1f\u503c<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">      \/\/ \u5b57\u7b26\u4e32\u64cd\u4f5c\u65b9\u6cd5\r\n      \/\/ 1. concat('\u5b57\u7b26\u4e321','\u5b57\u7b26\u4e322'....)\r\n      var str = 'andy';\r\n      console.log(str.concat('red')); \/\/ andyred\r\n\r\n      \/\/ 2. substr('\u622a\u53d6\u7684\u8d77\u59cb\u4f4d\u7f6e', '\u622a\u53d6\u51e0\u4e2a\u5b57\u7b26');\r\n      var str1 = '\u6539\u9769\u6625\u98ce\u5439\u6ee1\u5730';\r\n      \/\/ \u7b2c\u4e00\u4e2a2 \u662f\u7d22\u5f15\u53f7\u76842 \u4ece\u7b2c\u51e0\u4e2a\u5f00\u59cb  \u7b2c\u4e8c\u4e2a2 \u662f\u53d6\u51e0\u4e2a\u5b57\u7b26\r\n      console.log(str1.substr(2, 2)); \/\/ \u6625\u98ce<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">replace()\u65b9\u6cd5<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">replace() \u65b9\u6cd5\u7528\u4e8e\u5728\u5b57\u7b26\u4e32\u4e2d\u7528\u4e00\u4e9b\u5b57\u7b26\u66ff\u6362\u53e6\u4e00\u4e9b\u5b57\u7b26\uff0c\u5176\u4f7f\u7528\u683c\u5f0f\u5982\u4e0b\uff1a<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">\u5b57\u7b26\u4e32.replace(\u88ab\u66ff\u6362\u7684\u5b57\u7b26\u4e32\uff0c \u8981\u66ff\u6362\u4e3a\u7684\u5b57\u7b26\u4e32)\uff1b<\/pre>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">split()\u65b9\u6cd5<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">split()\u65b9\u6cd5\u7528\u4e8e\u5207\u5206\u5b57\u7b26\u4e32\uff0c\u5b83\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32\u5207\u5206\u4e3a\u6570\u7ec4\u3002\u5728\u5207\u5206\u5b8c\u6bd5\u4e4b\u540e\uff0c\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u65b0\u6570\u7ec4\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5176\u4f7f\u7528\u683c\u5f0f\u5982\u4e0b\uff1a<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">\u5b57\u7b26\u4e32.split(\"\u5206\u5272\u5b57\u7b26\")\r\n    \/\/ 1. \u66ff\u6362\u5b57\u7b26 replace('\u88ab\u66ff\u6362\u7684\u5b57\u7b26', '\u66ff\u6362\u4e3a\u7684\u5b57\u7b26')  \u5b83\u53ea\u4f1a\u66ff\u6362\u7b2c\u4e00\u4e2a\u5b57\u7b26\r\n    var str = \"andyandy\";\r\n    console.log(str.replace(\"a\", \"b\")); \/\/ bndyandy\r\n    \/\/ \u6709\u4e00\u4e2a\u5b57\u7b26\u4e32 'abcoefoxyozzopp'  \u8981\u6c42\u628a\u91cc\u9762\u6240\u6709\u7684 o \u66ff\u6362\u4e3a *\r\n    var str1 = \"abcoefoxyozzopp\";\r\n    while (str1.indexOf(\"o\") !== -1) {\r\n      str1 = str1.replace(\"o\", \"*\");\r\n    }\r\n    console.log(str1); \/\/ abc*ef*xy*zz*pp\r\n\r\n    \/\/ 2. \u5b57\u7b26\u8f6c\u6362\u4e3a\u6570\u7ec4 split('\u5206\u9694\u7b26')    \r\n    \/\/ \u524d\u9762\u6211\u4eec\u5b66\u8fc7 join \u628a\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\r\n    var str2 = \"red, pink, blue\";\r\n    console.log(str2.split(\",\")); \/\/[red,pink,blue]\r\n    var str3 = \"red&amp;pink&amp;blue\";\r\n    console.log(str3.split(\"&amp;\")); \/\/ [red,pink,blue]<\/pre>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u7b80\u5355\u6570\u636e\u7c7b\u578b\u548c\u590d\u6742\u6570\u636e\u7c7b\u578b<\/span><\/h2>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u7b80\u5355\u7c7b\u578b\uff08\u57fa\u672c\u6570\u636e\u7c7b\u578b\u3001\u503c\u7c7b\u578b\uff09<\/span><\/strong><\/span><span class=\"md-plain\">\uff1a\u5728\u5b58\u50a8\u65f6\u53d8\u91cf\u4e2d\u5b58\u50a8\u7684\u662f\u503c\u672c\u8eab\uff0c\u5305\u62ecstring \uff0cnumber\uff0cboolean\uff0cundefined\uff0cnull<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u590d\u6742\u6570\u636e\u7c7b\u578b\uff08\u5f15\u7528\u7c7b\u578b\uff09<\/span><\/strong><\/span><span class=\"md-plain\">\uff1a\u5728\u5b58\u50a8\u65f6\u53d8\u91cf\u4e2d\u5b58\u50a8\u7684\u4ec5\u4ec5\u662f\u5730\u5740\uff08\u5f15\u7528\uff09\uff0c\u901a\u8fc7 new \u5173\u952e\u5b57\u521b\u5efa\u7684\u5bf9\u8c61\uff08\u7cfb\u7edf\u5bf9\u8c61\u3001\u81ea\u5b9a\u4e49\u5bf9\u8c61\uff09\uff0c\u5982 Object\u3001Array\u3001Date\u7b49\uff1b<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u300c\u5806\u6808\u300d<\/span><\/strong><\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5806\u6808\u7a7a\u95f4\u5206\u914d\u533a\u522b\uff1a<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">1\u3001\u6808\uff08\u64cd\u4f5c\u7cfb\u7edf\uff09\uff1a\u7531\u64cd\u4f5c\u7cfb\u7edf\u81ea\u52a8\u5206\u914d\u91ca\u653e\u5b58\u653e\u51fd\u6570\u7684\u53c2\u6570\u503c\u3001\u5c40\u90e8\u53d8\u91cf\u7684\u503c\u7b49\u3002\u5176\u64cd\u4f5c\u65b9\u5f0f\u7c7b\u4f3c\u4e8e\u6570\u636e\u7ed3\u6784\u4e2d\u7684\u6808\uff1b<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7b80\u5355\u6570\u636e\u7c7b\u578b\u5b58\u653e\u5230\u6808\u91cc\u9762<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">2\u3001\u5806\uff08\u64cd\u4f5c\u7cfb\u7edf\uff09\uff1a\u5b58\u50a8\u590d\u6742\u7c7b\u578b(\u5bf9\u8c61)\uff0c\u4e00\u822c\u7531\u7a0b\u5e8f\u5458\u5206\u914d\u91ca\u653e\uff0c\u82e5\u7a0b\u5e8f\u5458\u4e0d\u91ca\u653e\uff0c\u7531\u5783\u573e\u56de\u6536\u673a\u5236\u56de\u6536\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7b80\u5355\u6570\u636e\u7c7b\u578b\u7684\u5b58\u50a8\u65b9\u5f0f<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u503c\u7c7b\u578b\u53d8\u91cf\u7684\u6570\u636e\u76f4\u63a5\u5b58\u653e\u5728\u53d8\u91cf\uff08\u6808\u7a7a\u95f4\uff09\u4e2d<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u590d\u6742\u6570\u636e\u7c7b\u578b\u7684\u5b58\u50a8\u65b9\u5f0f<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5f15\u7528\u7c7b\u578b\u53d8\u91cf\uff08\u6808\u7a7a\u95f4\uff09\u91cc\u5b58\u653e\u7684\u662f\u5730\u5740\uff0c\u771f\u6b63\u7684\u5bf9\u8c61\u5b9e\u4f8b\u5b58\u653e\u5728\u5806\u7a7a\u95f4\u4e2d<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u300c\u7b80\u5355\u7c7b\u578b\u4f20\u53c2\u300d<\/span><\/strong><\/span><span class=\"md-plain\"> \u51fd\u6570\u7684\u5f62\u53c2\u4e5f\u53ef\u4ee5\u770b\u505a\u662f\u4e00\u4e2a\u53d8\u91cf\uff0c\u5f53\u6211\u4eec\u628a\u4e00\u4e2a\u503c\u7c7b\u578b\u53d8\u91cf\u4f5c\u4e3a\u53c2\u6570\u4f20\u7ed9\u51fd\u6570\u7684\u5f62\u53c2\u65f6\uff0c\u5176\u5b9e\u662f\u628a\u53d8\u91cf\u5728\u6808\u7a7a\u95f4\u91cc\u7684\u503c\u590d\u5236\u4e86\u4e00\u4efd\u7ed9\u5f62\u53c2\uff0c\u90a3\u4e48\u5728\u65b9\u6cd5\u5185\u90e8\u5bf9\u5f62\u53c2\u505a\u4efb\u4f55\u4fee\u6539\uff0c\u90fd\u4e0d\u4f1a\u5f71\u54cd\u5230\u7684\u5916\u90e8\u53d8\u91cf\u3002<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  function fn(a) {\r\n      a++;\r\n      console.log(a); \r\n  }\r\n  var x = 10;\r\n  fn(x);\r\n  console.log(x)\uff1b<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/span><\/p>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">11<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">10<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s \"><strong><span class=\"md-plain\">\u590d\u6742\u6570\u636e\u7c7b\u578b\u4f20\u53c2<\/span><\/strong><\/span><span class=\"md-plain\"> \u51fd\u6570\u7684\u5f62\u53c2\u4e5f\u53ef\u4ee5\u770b\u505a\u662f\u4e00\u4e2a\u53d8\u91cf\uff0c\u5f53\u6211\u4eec\u628a\u5f15\u7528\u7c7b\u578b\u53d8\u91cf\u4f20\u7ed9\u5f62\u53c2\u65f6\uff0c\u5176\u5b9e\u662f\u628a\u53d8\u91cf\u5728\u6808\u7a7a\u95f4\u91cc\u4fdd\u5b58\u7684\u5806\u5730\u5740\u590d\u5236\u7ed9\u4e86\u5f62\u53c2\uff0c\u5f62\u53c2\u548c\u5b9e\u53c2\u5176\u5b9e\u4fdd\u5b58\u7684\u662f\u540c\u4e00\u4e2a\u5806\u5730\u5740\uff0c\u6240\u4ee5\u64cd\u4f5c\u7684\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\u3002<\/span><\/p>\n<pre class=\"md-fences mock-cm md-end-block\" lang=\"\" spellcheck=\"false\">  function Person(name) {\r\n      this.name = name;\r\n  }\r\n  function f1(x) { \/\/ x = p\r\n      console.log(x.name); \/\/ 2. \u8fd9\u4e2a\u8f93\u51fa\u4ec0\u4e48 ?    \r\n      x.name = \"\u5f20\u5b66\u53cb\";\r\n      console.log(x.name); \/\/ 3. \u8fd9\u4e2a\u8f93\u51fa\u4ec0\u4e48 ?    \r\n  }\r\n  var p = new Person(\"\u5218\u5fb7\u534e\");\r\n  console.log(p.name);    \/\/ 1. \u8fd9\u4e2a\u8f93\u51fa\u4ec0\u4e48 ?   \r\n  f1(p);\r\n  console.log(p.name);    \/\/ 4. \u8fd9\u4e2a\u8f93\u51fa\u4ec0\u4e48 ?<\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/span><\/p>\n<figure class=\"md-table-fig\">\n<table class=\"md-table\">\n<thead>\n<tr class=\"md-end-block\">\n<th><span class=\"td-span\"><span class=\"md-plain\">\u5218\u5fb7\u534e<\/span><\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5218\u5fb7\u534e<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain\">\u5f20\u5b66\u53cb<\/span><\/span><\/td>\n<\/tr>\n<tr class=\"md-end-block\">\n<td><span class=\"td-span\"><span class=\"md-plain md-expand\">\u5f20\u5b66\u53cb<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00 \u8ddf\u7740\u9ed1\u9a6c\u6559\u7a0b\u5b66\u4e60JavaScript\u5185\u5bb9\uff0c\u628a\u8fd9\u4e00\u9636\u6bb5\u7684\u5b66\u4e60\u5185\u5bb9\u6574\u7406\u6210\u7b14\u8bb0\uff0c\u67e5\u6f0f\u8865\u7f3a\u3002 \u4e3a\u4e86\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\uff0c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":67,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-76","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-front-end"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.10 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JavaScript - Rock<\/title>\n<meta name=\"description\" content=\"JavaScript\u57fa\u7840\u77e5\u8bc6\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.noblerock.cn\/index.php\/2022\/11\/22\/rock-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript - Rock\" \/>\n<meta property=\"og:description\" content=\"JavaScript\u57fa\u7840\u77e5\u8bc6\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.noblerock.cn\/index.php\/2022\/11\/22\/rock-javascript\/\" \/>\n<meta property=\"og:site_name\" content=\"Rock\" \/>\n<meta property=\"article:published_time\" content=\"2022-11-22T14:52:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.noblerock.cn\/wp-content\/uploads\/2022\/11\/hd.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"noblerock5\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" 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