{"id":1394,"date":"2022-08-13T14:47:33","date_gmt":"2022-08-13T06:47:33","guid":{"rendered":"https:\/\/blog.cauchyschwarz.com\/?p=1394"},"modified":"2022-08-20T23:55:53","modified_gmt":"2022-08-20T15:55:53","slug":"professional-javascript-for-web-developers-3rd-edition-part-3","status":"publish","type":"post","link":"https:\/\/blog.cauchyschwarz.com\/?p=1394","title":{"rendered":"Professional JavaScript for Web Developers, 3rd Edition, Part 3"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-right counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69e0ad9af32c2\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69e0ad9af32c2\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#%E7%AC%AC4%E7%AB%A0_%E5%8F%98%E9%87%8F%E3%80%81%E4%BD%9C%E7%94%A8%E5%9F%9F%E5%92%8C%E5%86%85%E5%AD%98%E9%97%AE%E9%A2%98\" >\u7b2c4\u7ae0 \u53d8\u91cf\u3001\u4f5c\u7528\u57df\u548c\u5185\u5b58\u95ee\u9898<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#1%E5%9F%BA%E6%9C%AC%E7%B1%BB%E5%9E%8B%E5%92%8C%E5%BC%95%E7%94%A8%E7%B1%BB%E5%9E%8B%E7%9A%84%E5%80%BC\" >1.\u57fa\u672c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b\u7684\u503c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#2%E6%89%A7%E8%A1%8C%E7%8E%AF%E5%A2%83%E5%8F%8A%E4%BD%9C%E7%94%A8%E5%9F%9F\" >2.\u6267\u884c\u73af\u5883\u53ca\u4f5c\u7528\u57df<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#3%E5%9E%83%E5%9C%BE%E6%94%B6%E9%9B%86\" >3.\u5783\u573e\u6536\u96c6<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#%E7%AE%A1%E7%90%86%E5%86%85%E5%AD%98\" >\u7ba1\u7406\u5185\u5b58<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#%E7%AC%AC5%E7%AB%A0_%E5%BC%95%E7%94%A8%E7%B1%BB%E5%9E%8B\" >\u7b2c5\u7ae0 \u5f15\u7528\u7c7b\u578b<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#1Object%E7%B1%BB%E5%9E%8B\" >1.Object\u7c7b\u578b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#2Array%E7%B1%BB%E5%9E%8B\" >2.Array\u7c7b\u578b<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#1%E6%A3%80%E6%B5%8B%E6%95%B0%E7%BB%84\" >1.\u68c0\u6d4b\u6570\u7ec4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#2%E8%BD%AC%E6%8D%A2%E6%96%B9%E6%B3%95\" >2.\u8f6c\u6362\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#3%E6%A0%88%E6%96%B9%E6%B3%95\" >3.\u6808\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#4%E9%98%9F%E5%88%97%E6%96%B9%E6%B3%95\" >4.\u961f\u5217\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#5%E9%87%8D%E6%8E%92%E5%BA%8F%E6%96%B9%E6%B3%95\" >5.\u91cd\u6392\u5e8f\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#6%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95\" >6.\u64cd\u4f5c\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#7%E4%BD%8D%E7%BD%AE%E6%96%B9%E6%B3%95\" >7.\u4f4d\u7f6e\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#8%E8%BF%AD%E4%BB%A3%E6%96%B9%E6%B3%95\" >8.\u8fed\u4ee3\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#9%E5%BD%92%E5%B9%B6%E6%96%B9%E6%B3%95\" >9.\u5f52\u5e76\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#3Date%E7%B1%BB%E5%9E%8B\" >3.Date\u7c7b\u578b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#4RegExp%E7%B1%BB%E5%9E%8B\" >4.RegExp\u7c7b\u578b<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#%E5%88%9B%E5%BB%BA%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F\" >\u521b\u5efa\u6b63\u5219\u8868\u8fbe\u5f0f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#RegExp%E5%AE%9E%E4%BE%8B%E5%B1%9E%E6%80%A7\" >RegExp\u5b9e\u4f8b\u5c5e\u6027<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#RegExp%E5%AE%9E%E4%BE%8B%E6%96%B9%E6%B3%95\" >RegExp\u5b9e\u4f8b\u65b9\u6cd5<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#5Function%E7%B1%BB%E5%9E%8B\" >5.Function\u7c7b\u578b<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#%E5%87%BD%E6%95%B0%E5%A3%B0%E6%98%8E%E4%B8%8E%E8%A1%A8%E8%BE%BE%E5%BC%8F\" >\u51fd\u6570\u58f0\u660e\u4e0e\u8868\u8fbe\u5f0f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#%E5%87%BD%E6%95%B0%E5%86%85%E9%83%A8%E5%B1%9E%E6%80%A7\" >\u51fd\u6570\u5185\u90e8\u5c5e\u6027<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#%E5%87%BD%E6%95%B0%E5%B1%9E%E6%80%A7%E5%92%8C%E6%96%B9%E6%B3%95\" >\u51fd\u6570\u5c5e\u6027\u548c\u65b9\u6cd5<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#6%E5%9F%BA%E6%9C%AC%E5%8C%85%E8%A3%85%E7%B1%BB%E5%9E%8B\" >6.\u57fa\u672c\u5305\u88c5\u7c7b\u578b<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#1Boolean%E7%B1%BB%E5%9E%8B\" >1.Boolean\u7c7b\u578b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#2Number%E7%B1%BB%E5%9E%8B\" >2.Number\u7c7b\u578b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#3String%E7%B1%BB%E5%9E%8B\" >3.String\u7c7b\u578b<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#7%E5%8D%95%E4%BD%93%E5%86%85%E7%BD%AE%E5%AF%B9%E8%B1%A1\" >7.\u5355\u4f53\u5185\u7f6e\u5bf9\u8c61<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#Global%E5%AF%B9%E8%B1%A1\" >Global\u5bf9\u8c61<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=1394\/#Math%E5%AF%B9%E8%B1%A1\" >Math\u5bf9\u8c61<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC4%E7%AB%A0_%E5%8F%98%E9%87%8F%E3%80%81%E4%BD%9C%E7%94%A8%E5%9F%9F%E5%92%8C%E5%86%85%E5%AD%98%E9%97%AE%E9%A2%98\"><\/span>\u7b2c4\u7ae0 \u53d8\u91cf\u3001\u4f5c\u7528\u57df\u548c\u5185\u5b58\u95ee\u9898<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1%E5%9F%BA%E6%9C%AC%E7%B1%BB%E5%9E%8B%E5%92%8C%E5%BC%95%E7%94%A8%E7%B1%BB%E5%9E%8B%E7%9A%84%E5%80%BC\"><\/span>1.\u57fa\u672c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b\u7684\u503c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Undefined\uff0cNull\uff0cBoolean\uff0cNumber\u548cString\u662f\u57fa\u672c\u7c7b\u578b\uff0c\u4ed6\u4eec\u662f\u6309\u503c\u8bbf\u95ee\u7684\uff0c\u53ef\u4ee5\u64cd\u4f5c\u4fdd\u5b58\u5728\u53d8\u91cf\u4e2d\u7684\u5b9e\u9645\u7684\u503c\u3002<\/p>\n\n\n\n<p><strong>\u57fa\u672c\u7c7b\u578b<\/strong>\u662f\u7b80\u5355\u7684\u6570\u636e\u6bb5\uff0c<strong>\u5f15\u7528\u7c7b\u578b<\/strong>\u6307\u90a3\u4e9b\u53ef\u80fd\u7531\u591a\u4e2a\u503c\u6784\u6210\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p>\u5f15\u7528\u7c7b\u578b\u53ef\u4ee5\u4fee\u6539\u5176\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u57fa\u672c\u7c7b\u578b\u5219\u4e0d\u5141\u8bb8\u8fd9\u79cd\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p>\u590d\u5236\u57fa\u672c\u7c7b\u578b\u53d8\u91cf\u65f6\uff0c\u4e24\u4e2a\u53d8\u91cf\u7684\u503c\u7684\u5185\u5b58\u7a7a\u95f4\u662f\u72ec\u7acb\u7684\u3002<\/p>\n\n\n\n<p>\u590d\u5236\u5f15\u7528\u7c7b\u578b\u65f6\uff0c\u4e24\u4e2a\u53d8\u91cf\u5176\u5b9e\u4fdd\u5b58\u7684\u662f\u540c\u4e00\u4e2a\u6307\u9488\u3002<\/p>\n\n\n\n<p>ECMAScript\u4e2d\u6240\u6709\u51fd\u6570\u7684\u53c2\u6570\u90fd\u662f\u6309\u503c\u4f20\u9012\u7684\u3002<\/p>\n\n\n\n<p>instanceof\u64cd\u4f5c\u7b26<\/p>\n\n\n\n<p>instanceof\u53ef\u4ee5\u7528\u6765\u5224\u5b9a\u5bf9\u8c61\u5177\u4f53\u662f\u5426\u5c5e\u4e8e\u67d0\u4e00\u4e2a\u7c7b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2%E6%89%A7%E8%A1%8C%E7%8E%AF%E5%A2%83%E5%8F%8A%E4%BD%9C%E7%94%A8%E5%9F%9F\"><\/span>2.\u6267\u884c\u73af\u5883\u53ca\u4f5c\u7528\u57df<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">JavaScript\u6ca1\u6709\u5757\u7ea7\u4f5c\u7528\u57df\uff0c\u53ea\u6709&#8221;\u51fd\u6570\u7ea7&#8221;\u4f5c\u7528\u57df\u3002<\/mark><\/strong><\/p>\n\n\n\n<p>\u6240\u4ee5\u4e0eC\/C++\/Java\u4e0d\u540c\uff0c\u4e00\u4e9b&#8221;\u4e34\u65f6\u53d8\u91cf&#8221;\u5728\u76f8\u5e94\u7684\u8bed\u53e5\u5916\u90e8\u8fd8\u662f\u53ef\u4ee5\u8bbf\u95ee\u7684\u3002<\/p>\n\n\n\n<p>JavaScript\u4e2d\u7684\u4f5c\u7528\u57df\u662f\u6309\u5168\u5c40\u3001\u51fd\u6570\u7ea7\u3001with\u8bed\u53e5\u6765\u5212\u5206\u7684\u3002\u4f7f\u7528var\u58f0\u660e\u7684\u53d8\u91cf\u4f1a\u88ab\u81ea\u52a8\u6dfb\u52a0\u5230\u6700\u8fd1\u7684\u73af\u5883\u4e2d\uff0c\u800c\u5982\u679c\u6ca1\u6709var\uff0c\u5219\u4f1a\u76f4\u63a5\u6dfb\u52a0\u5230\u5168\u5c40\u73af\u5883\u4e2d\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3%E5%9E%83%E5%9C%BE%E6%94%B6%E9%9B%86\"><\/span>3.\u5783\u573e\u6536\u96c6<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5783\u573e\u56de\u6536\u7b97\u6cd5\uff1a\u6807\u8bb0\u6e05\u695a(mark-and-sweep\uff09\uff0c\u5f15\u7528\u8ba1\u6570(reference counting)\uff1b<\/p>\n\n\n\n<p>\u6027\u80fd\u95ee\u9898\uff1a\u5783\u573e\u56de\u6536\u6709\u6027\u80fdoverhead\u3002<\/p>\n\n\n\n<p>IE\u53ef\u4ee5\u901a\u8fc7window.CollectGarbage()\u4e3b\u52a8\u89e6\u53d1\u5783\u573e\u6536\u96c6\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AE%A1%E7%90%86%E5%86%85%E5%AD%98\"><\/span>\u7ba1\u7406\u5185\u5b58<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5bf9\u8c61\u4e0d\u518d\u4f7f\u7528\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u8d4b\u503cnull\u89e3\u9664\u5176\u5f15\u7528\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC5%E7%AB%A0_%E5%BC%95%E7%94%A8%E7%B1%BB%E5%9E%8B\"><\/span>\u7b2c5\u7ae0 \u5f15\u7528\u7c7b\u578b<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p>ECMAScript\u4e2d\u7684\u5f15\u7528\u7c7b\u578b\u867d\u7136\u548c\u7c7b\u5f88\u7c7b\u4f3c\uff0c\u4f46\u662f\u5e76\u4e0d\u5177\u5907\u4f20\u7edf\u7684\u9762\u5411\u5bf9\u8c61\u8bed\u8a00\u6240\u652f\u6301\u7684\u7c7b\u548c\u63a5\u53e3\u7b49\u57fa\u672c\u7ed3\u6784\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1Object%E7%B1%BB%E5%9E%8B\"><\/span>1.Object\u7c7b\u578b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u521b\u5efa\u5bf9\u8c61\u7684\u65f6\u5019\u53ef\u4ee5\u4f7f\u7528\u5bf9\u8c61\u5b57\u9762\u91cf\u8868\u793a\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">        var person = {\n            name : \"Nicholas\",\n            age : 29\n        };\n\n        alert(person.name);\n        alert(person.age);<\/code><\/pre>\n\n\n\n<p>var person = new Object()\uff1b<\/p>\n\n\n\n<p>\u53ef\u4ee5\u76f4\u63a5\u7b80\u5199\u4e3a\uff1avar person = {};<\/p>\n\n\n\n<p>\u5728\u901a\u8fc7\u5bf9\u8c61\u5b57\u9762\u91cf\u5b9a\u4e49\u5bf9\u8c61\u65f6\uff0c\u5b9e\u9645\u4e0d\u4f1a\u8c03\u7528Object\u6784\u9020\u51fd\u6570\u3002<\/p>\n\n\n\n<p>\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\u6709\u4e24\u79cd\u65b9\u6cd5\uff0c\u4f7f\u7528\u6210\u5458\u53d8\u91cf\u6216\u8005\u65b9\u62ec\u53f7\u8868\u793a\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">alert(person[\"name\"]);\nalert(person.name);<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528\u65b9\u62ec\u53f7\u8868\u793a\u6cd5\u7684\u597d\u5904\u662f\u5c5e\u6027\u540d\u53ef\u4ee5\u662f\u53d8\u91cf\uff0c\u4ee5\u53ca\u53ef\u4ee5\u8bbf\u95ee\u5c5e\u6027\u540d\u662f\u4e0d\u5408\u6cd5\u5b57\u7b26\u7684\u5c5e\u6027\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2Array%E7%B1%BB%E5%9E%8B\"><\/span>2.Array\u7c7b\u578b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><em>ECMAScript\u4e2d\u7684\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u53ef\u4ee5\u5b58\u50a8\u4e0d\u540c\u7c7b\u578b\u7684\u503c\u3002<\/em><\/p>\n\n\n\n<p><strong>\u6784\u9020\u51fd\u6570\uff1a<\/strong><\/p>\n\n\n\n<p>var colors = new Array();<\/p>\n\n\n\n<p><strong>\u5982\u679c\u4f20\u9012\u4e00\u4e2aNumber\u4f5c\u4e3a\u53c2\u6570\uff0c\u5219\u4f1a\u6307\u5b9a\u521b\u5efa\u7684\u6570\u7ec4\u7684\u957f\u5ea6\uff1a<\/strong><\/p>\n\n\n\n<p>var colors = new Array(20); \/\/ \u521b\u5efa\u7684\u6570\u7ec4\u957f\u5ea6\u4e3a20<\/p>\n\n\n\n<p>\u5982\u679c\u4f20\u9012\u7684\u662f\u5176\u4ed6\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5219\u4f1a\u5c06\u53c2\u6570\u89e3\u6790\u4e3a\u6570\u7ec4\u7684\u5143\u7d20\u3002<\/p>\n\n\n\n<p>var colors = new Array(&#8220;red&#8221;, &#8220;blue&#8221;, &#8220;green&#8221;);<\/p>\n\n\n\n<p>var names = new Array(&#8220;Greg&#8221;);<\/p>\n\n\n\n<p>\u4e5f\u53ef\u4ee5\u901a\u8fc7<strong>\u5b57\u9762\u91cf\u7684\u65b9\u5f0f\u521b\u5efa\u6570\u7ec4<\/strong>\uff1a<\/p>\n\n\n\n<p>var colors = [&#8220;red&#8221;, &#8220;blue&#8221;, &#8220;green&#8221;];<\/p>\n\n\n\n<p>var names = []; \/\/ \u521b\u5efa\u4e00\u4e2a\u7a7a\u6570\u7ec4\uff1b<\/p>\n\n\n\n<p>var values = [1, 2, ]; \/\/\u4e0d\u80fd\u8fd9\u6837\u5199\uff0c\u5404\u4e2a\u6d4f\u89c8\u5668\u5b9e\u73b0\u4e0d\u4e00\u6837\uff0c\u751f\u6210\u7684\u6570\u7ec4\u957f\u5ea6\u53ef\u80fd\u662f2\uff0c\u4e5f\u53ef\u80fd\u662f3<\/p>\n\n\n\n<p>var values = [,,,,]; \/\/\u4e0d\u80fd\u8fd9\u6837\u5199\uff0c\u539f\u7406\u8ddf\u4e0a\u9762\u4e00\u6837\uff1b<\/p>\n\n\n\n<p>\u8ddfObject\u4e00\u6837\uff0c\u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf\u65f6\uff0c\u4e0d\u4f1a\u8c03\u7528Array\u7684\u6784\u9020\u51fd\u6570\u3002<\/p>\n\n\n\n<p>\u6570\u7ec4\u7684length\u5c5e\u6027\u4e0d\u662f\u53ea\u8bfb\u7684\uff0c\u53ef\u4ee5\u4fee\u6539\uff0c\u56e0\u6b64\u53ef\u4ee5\u901a\u8fc7\u6539length\u5c5e\u6027\u79fb\u9664\u6216\u6dfb\u52a0\u6570\u7ec4\u5143\u7d20\uff0c\u65b0\u6dfb\u52a0\u7684\u6570\u7ec4\u5143\u7d20\u4e3aundefined\u3002<\/p>\n\n\n\n<p><strong>\u5bf9\u6570\u7ec4\u4f7f\u7528\u8d85\u51fa\u5176\u957f\u5ea6\u7684\u7d22\u5f15\u65f6(\u5fc5\u987b\u662f\u8d4b\u503c\u800c\u4e0d\u662f\u8bfb\u53d6)\uff0c\u6570\u7ec4\u7684\u957f\u5ea6\u4f1a\u81ea\u52a8\u6269\u5c55\u5230\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e2a\u7d22\u5f15\u3002<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">        var colors = [\"red\", \"blue\", \"green\"];    \/\/creates an array with three strings\n        colors[99] = \"black\";                     \/\/add a color (position 99)\n        alert(colors.length);  \/\/100\n<\/code><\/pre>\n\n\n\n<p>\u6570\u7ec4\u6700\u591a\u53ef\u4ee5\u5305\u542b4294967295\u4e2a\u9879\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1%E6%A3%80%E6%B5%8B%E6%95%B0%E7%BB%84\"><\/span>1.\u68c0\u6d4b\u6570\u7ec4<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>instanceof\u53ea\u80fd\u9002\u7528\u4e8e\u53ea\u6709\u4e00\u4e2a\u5168\u5c40\u6267\u884c\u73af\u5883\u7684\u73af\u5883\uff1b<\/p>\n\n\n\n<p>ECMAScript\u65b0\u589e\u4e86Array.isArray()\u65b9\u6cd5\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2%E8%BD%AC%E6%8D%A2%E6%96%B9%E6%B3%95\"><\/span>2.\u8f6c\u6362\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6570\u7ec4\u7684valueOf\u65b9\u6cd5\u8fd4\u56de\u7684\u8fd8\u662f\u6570\u7ec4\u672c\u8eab\uff0c\u800ctoString\u65b9\u6cd5\u5219\u4f1a\u8fd4\u56de\u6570\u7ec4\u4e2d\u6bcf\u4e2a\u5143\u7d20\u7684\u5b57\u7b26\u4e32\u5f62\u5f0f\u548c\u9017\u53f7\u62fc\u63a5\u6210\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<p>\u53ef\u4ee5\u7528join\u65b9\u6cd5\u6307\u5b9a\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u65f6\u4f7f\u7528\u7684\u5206\u9694\u7b26\u3002<\/p>\n\n\n\n<p>\u8c03\u7528\u6570\u7ec4\u7684toLocaleString\u65f6\uff0c\u4f1a\u5206\u522b\u8c03\u7528\u6bcf\u4e2a\u5143\u7d20\u7684toLocaleString\u65b9\u6cd5\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3%E6%A0%88%E6%96%B9%E6%B3%95\"><\/span>3.\u6808\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5373push\u548cpop\u4e24\u79cd\u65b9\u6cd5\u3002push\u65f6\u53ef\u4ee5\u4e00\u6b21\u6027\u538b\u5165\u591a\u4e2a\u5143\u7d20\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4%E9%98%9F%E5%88%97%E6%96%B9%E6%B3%95\"><\/span>4.\u961f\u5217\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>shift<\/strong>\u65b9\u6cd5\u53ef\u4ee5\u79fb\u9664\u6570\u7ec4\u7b2c\u4e00\u4e2a\u5143\u7d20\u5e76\u8fd4\u56de\u8be5\u5143\u7d20\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5%E9%87%8D%E6%8E%92%E5%BA%8F%E6%96%B9%E6%B3%95\"><\/span>5.\u91cd\u6392\u5e8f\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>reverse\u65b9\u6cd5\u53ef\u4ee5\u5c06\u6570\u7ec4\u5012\u7f6e\u3002<\/p>\n\n\n\n<p><strong>sort\u65b9\u6cd5\u53ef\u4ee5\u5bf9\u6570\u7ec4\u91cd\u65b0\u6392\u5e8f\uff0c\u4f46\u662f\u9ed8\u8ba4\u662f\u5c06\u6bcf\u4e2a\u5143\u7d20\u5148\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff0c\u518d\u8fdb\u884c\u6392\u5e8f(\u5f88\u5751\u7239)\u3002<\/strong>\u6240\u4ee5\u9700\u8981\u81ea\u5df1\u63d0\u4f9b\u4e00\u4e2a\u6bd4\u8f83\u51fd\u6570\u4f5c\u4e3asort\u7684\u53c2\u6570\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95\"><\/span>6.\u64cd\u4f5c\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><em>concat<\/em>\u65b9\u6cd5<\/p>\n\n\n\n<p>\u57fa\u4e8e\u5f53\u524d\u6570\u7ec4\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u526f\u672c\uff0c\u5e76\u5728\u672b\u5c3e\u6dfb\u52a0\u65b0\u7684\u5143\u7d20\u3002<\/p>\n\n\n\n<p><em>slice<\/em>\u65b9\u6cd5<\/p>\n\n\n\n<p>\u4f20\u5165\u5f00\u59cb\u548c\u7ed3\u675f\u4f4d\u7f6e(\u53ef\u9009)\u7d22\u5f15(\u5de6\u95ed\u53f3\u5f00)\uff0c\u57fa\u4e8e\u8fd9\u4e2a\u533a\u95f4\u5185\u7684\u5143\u7d20\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\u3002<\/p>\n\n\n\n<p>\u7d22\u5f15\u53ef\u4ee5\u662f\u8d1f\u7684\uff0c\u8ddfpython\u7684\u5904\u7406\u65b9\u5f0f\u7c7b\u4f3c\u3002<\/p>\n\n\n\n<p><em>splice<\/em>\u65b9\u6cd5<\/p>\n\n\n\n<p>splice(start_index\uff0cnum_of_delete_items, insert_item1, insert_item2,&#8230;.)<\/p>\n\n\n\n<p>\u53ef\u4ee5\u5220\u9664\u4ecestart_index\u4f4d\u7f6e\u5f00\u59cb\u7684num_of_delete_items\u4e2a\u5143\u7d20\uff0c\u7136\u540e\u518d\u5728\u6b64\u4f4d\u7f6e\u524d\u63d2\u5165insert_item1\uff0cinsert_item2\u7b49\u5143\u7d20\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u5728\u6570\u7ec4\u524d\u9762\u63d2\u5165\u5143\u7d20\u7684\u4f7f\u7528\u65b9\u6cd5\u4e3ainsert(0, 0, item1, item2, &#8230;)\u3002<\/p>\n\n\n\n<p>splice\u8fd4\u56de\u503c\u4e3a\u88ab\u5220\u6389\u7684\u5143\u7d20\u6784\u6210\u7684\u6570\u7ec4\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"7%E4%BD%8D%E7%BD%AE%E6%96%B9%E6%B3%95\"><\/span>7.\u4f4d\u7f6e\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>indexOf\u65b9\u6cd5\u4ece\u5934\u5f00\u59cb\u67e5\u627e\u5143\u7d20\uff0clastIndexOf\u65b9\u6cd5\u5219\u4ece\u672b\u5c3e\u5411\u524d\u5f00\u59cb\u67e5\u627e\u5143\u7d20\u3002<\/p>\n\n\n\n<p>\u67e5\u627e\u65f6\u4f7f\u7528\u5168\u7b49\u6bd4\u8f83\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p>\u627e\u4e0d\u5230\u8fd4\u56de-1\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"8%E8%BF%AD%E4%BB%A3%E6%96%B9%E6%B3%95\"><\/span>8.\u8fed\u4ee3\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>every\u65b9\u6cd5\uff0c\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u9879\u8fd0\u884c\u7ed9\u5b9a\u51fd\u6570\uff0c\u5982\u679c\u8be5\u51fd\u6570\u5bf9\u6bcf\u4e00\u9879\u90fd\u8fd4\u56detrue\uff0c\u5219\u8fd4\u56detrue\uff1b<\/li><li>filter\u65b9\u6cd5\uff0c\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u9879\u8fd0\u884c\u7ed9\u5b9a\u51fd\u6570\uff0c\u8fd4\u56de\u8be5\u51fd\u6570\u4f1a\u8fd4\u56detrue\u7684\u9879\u7ec4\u6210\u7684\u6570\u7ec4\uff1b<\/li><li>forEach\u65b9\u6cd5\uff0c\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u9879\u8fd0\u884c\u7ed9\u5b9a\u51fd\u6570\uff0c\u65e0\u8fd4\u56de\u503c\uff1b<\/li><li>map\u65b9\u6cd5\uff0c\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u9879\u8fd0\u884c\u7ed9\u5b9a\u51fd\u6570\uff0c\u8fd4\u56de\u6bcf\u6b21\u51fd\u6570\u8c03\u7528\u7684\u7ed3\u679c\u7ec4\u6210\u7684\u6570\u7ec4\uff1b<\/li><li>some\u65b9\u6cd5\uff0c\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u9879\u8fd0\u884c\u7ed9\u5b9a\u51fd\u6570\uff0c\u5982\u679c\u8be5\u51fd\u6570\u5bf9\u4efb\u4e00\u9879\u8fd4\u56detrue\uff0c\u5219\u8fd4\u56detrue\u3002<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"9%E5%BD%92%E5%B9%B6%E6%96%B9%E6%B3%95\"><\/span>9.\u5f52\u5e76\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>reduce\u548creduceRight\u65b9\u6cd5\u90fd\u662f\u8fed\u4ee3\u6570\u7ec4\u7684\u6240\u6709\u9879\uff0c\u7136\u540e\u6784\u5efa\u4e00\u4e2a\u6700\u7ec8\u7684\u8fd4\u56de\u503c\u3002reduce\u4ece\u6570\u7ec4\u7684\u7b2c\u4e00\u9879\u5f00\u59cb\u9010\u4e2a\u904d\u5386\uff0creduceRight\u5219\u4ece\u6570\u7ec4\u7684\u6700\u540e\u4e00\u9879\u5f00\u59cb\uff0c\u5411\u524d\u5f00\u59cb\u904d\u5386\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">        var values = [1,2,3,4,5];\n        var sum = values.reduce(function(prev, cur, index, array){\n            return prev + cur;\n        });\n        alert(sum);\n<\/code><\/pre>\n\n\n\n<p>reduce\u7684\u51fd\u6570\u63a5\u65364\u4e2a\u53c2\u6570\uff0cprev\u4e3a\u524d\u4e00\u9879\u7684\u503c\uff0ccur\u4e3a\u5f53\u524d\u9879\u7684\u503c\uff0cindex\u4e3a\u5f53\u524d\u9879\u7684\u7d22\u5f15\uff0carray\u4e3a\u6570\u7ec4\u5bf9\u8c61\u3002\u7b2c\u4e00\u6b21\u8fed\u4ee3\u53d1\u751f\u5728\u6570\u7ec4\u7684\u7b2c\u4e8c\u9879\u4e0a\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3Date%E7%B1%BB%E5%9E%8B\"><\/span>3.Date\u7c7b\u578b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Date\u7c7b\u578b\u4f7f\u7528\u81eaUTC 1970\u5e741\u67081\u65e5\u5348\u591c(\u96f6\u65f6)\u5f00\u59cb\u7ecf\u8fc7\u7684\u6beb\u79d2\u6570\u6765\u4fdd\u5b58\u65e5\u671f\u3002<\/p>\n\n\n\n<p>\u6784\u9020\u51fd\u6570\uff1a<\/p>\n\n\n\n<p>a.\u65e0\u53c2\u6784\u9020\u51fd\u6570<\/p>\n\n\n\n<p>var now = new Date;<\/p>\n\n\n\n<p>b.\u63d0\u4f9b\u81eaUTC 1970\u5e741\u67081\u65e5\u5348\u591c(\u96f6\u65f6)\u7ecf\u8fc7\u7684\u6beb\u79d2\u6570\u6765\u6784\u9020\u65e5\u671f\u3002\u8fd9\u4e2a\u6beb\u79d2\u6570\u53ef\u4ee5\u7528Date.parse\u548cDate.UTC\u65b9\u6cd5\u6765\u83b7\u5f97\u3002Date.parse\u65b9\u6cd5\u901a\u8fc7\u89e3\u6790\u5b57\u7b26\u4e32\u6765\u8ba1\u7b97\u8fd9\u4e2a\u65e5\u671f\u7684\u6beb\u79d2\u6570\uff0cDate.UTC\u5219\u53ef\u4ee5\u76f4\u63a5\u6307\u5b9a\u5e74\u3001\u6708\u3001\u65e5\u7b49\u5177\u4f53\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u5c06\u5730\u533a\u8bbe\u7f6e\u4e3a\u7f8e\u56fd\u7684\u6d4f\u89c8\u5668\uff0cDate.parse\u65b9\u6cd5\u901a\u5e38\u90fd\u652f\u6301\u4ee5\u4e0b\u683c\u5f0f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>&#8220;\u6708\/\u65e5\/\u5e74&#8221;\uff0c\u59826\/13\/2004\uff1b<\/li><li>&#8220;\u82f1\u6587\u6708\u540d \u65e5,\u5e74&#8221;\uff0c\u5982January 12,2004<\/li><li>&#8220;\u82f1\u6587\u661f\u671f\u51e0 \u82f1\u6587\u6708\u540d \u65e5 \u5e74 \u65f6:\u5206:\u79d2 \u65f6\u533a&#8221;\uff0c\u5982Tue May 25 2004 00:00:00 GMT-0700<\/li><li>YYYY-MM-DDTHH:mm:ss.sssZ\uff0c\u59822004-05-25T00:00:00\uff0c\u53ea\u6709\u652f\u6301ECMAScript5\u7684\u5b9e\u73b0\u652f\u6301\u8fd9\u79cd\u683c\u5f0f\uff1b<\/li><\/ul>\n\n\n\n<p>\u5982\u679cDate.parse()\u65b9\u6cd5\u4f20\u5165\u7684\u5b57\u7b26\u4e32\u4e0d\u80fd\u8868\u793a\u65e5\u671f\uff0c\u90a3\u4e48\u5b83\u4f1a\u8fd4\u56deNaN\u3002\u5982\u679c\u76f4\u63a5\u5c06\u8868\u793a\u65e5\u671f\u7684\u5b57\u7b26\u4e32\u4f20\u7ed9Date\u65b9\u6cd5\uff0cDate\u4e5f\u4f1a\u81ea\u52a8\u8c03\u7528Date.parse\u65b9\u6cd5\u89e3\u6790\u8fd9\u4e2a\u65e5\u671f\u3002<\/p>\n\n\n\n<p>Date.UTC()\u65b9\u6cd5\u7684\u8f93\u5165\u662f\u5e74\u4efd\u3001\u57fa\u4e8e0\u7684\u6708\u4efd\uff0c\u6708\u4e2d\u7684\u54ea\u4e00\u5929(1\u523031)\uff0c\u5c0f\u65f6\u6570(0\u523023)\uff0c\u5206\u949f\uff0c\u79d2\u548c\u6beb\u79d2\u6570\u3002\u53ef\u4ee5\u53ea\u63d0\u4f9b\u524d\u9762\u7684\u82e5\u5e72\u4e2a\u800c\u7701\u7565\u540e\u9762\u7684\u53c2\u6570\u3002<\/p>\n\n\n\n<p>Date\u7684\u6784\u9020\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u76f4\u63a5\u63a5\u53d7Date.UTC\u65b9\u6cd5\u7684\u53c2\u6570\u6765\u6784\u5efa\u65e5\u671f\u3002Date.UTC()\u4e0eDate.parse()\u65b9\u6cd5\u533a\u522b\u5728\u4e8e\u524d\u8005\u57fa\u4e8e\u672c\u5730\u65f6\u533a\u800c\u540e\u8005\u57fa\u4e8eGMT\u6765\u6784\u5efa\u65e5\u671f\u3002<\/p>\n\n\n\n<p>Date.now()\u65b9\u6cd5\u8fd4\u56de\u8c03\u7528\u6b64\u51fd\u6570\u65f6\u7684\u65e5\u671f\u548c\u65f6\u95f4\u7684\u6beb\u79d2\u6570\u3002<\/p>\n\n\n\n<p>\u5176\u4ed6\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>toString()\uff1a\u8fd4\u56de\u5e26\u6709\u65f6\u533a\u4fe1\u606f\u7684\u5b57\u7b26\u4e32\u65f6\u95f4<\/li><li>toLocaleString()\uff1a\u8fd4\u56de\u4e0e\u6d4f\u89c8\u5668\u8bbe\u7f6e\u5f53\u524d\u65f6\u533a\u9002\u5e94\u7684\u5b57\u7b26\u4e32\u65f6\u95f4<\/li><li>valueOf()\uff1a\u8fd4\u56de\u65e5\u671f\u7684\u6beb\u79d2\u6570\uff0c\u56e0\u6b64\u4e0d\u540cDate\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528'&lt;&#8216;\uff0c&#8217;&gt;&#8217;\uff0c&#8217;=&#8217;\u8fdb\u884c\u76f8\u4e92\u6bd4\u8f83\u3002<\/li><\/ul>\n\n\n\n<p>\u65e5\u671f\u683c\u5f0f\u5316\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>toDateString()<\/li><li>toTimeString()<\/li><li>toLocaleDateString()<\/li><li>toLocalTimeString()<\/li><li>toUTCString()<\/li><\/ul>\n\n\n\n<p>\u65e5\u671f\/\u65f6\u95f4\u7ec4\u4ef6\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>getTime()\uff0c\u8fd4\u56de\u6beb\u79d2\u6570\uff0c\u4e0evalueOf()\u8fd4\u56de\u503c\u76f8\u540c<\/li><li>setTime()\uff0c\u8bbe\u7f6e\u6beb\u79d2\u6570\u8868\u793a\u7684\u65e5\u671f<\/li><li>setFullYear\/getFullYear<\/li><li>setMonth\/getMonth<\/li><li>setDate\/getDate \u4e00\u6708\u4e2d\u7684\u5929\u6570(1\u523031)<\/li><li>setDay\/getDay \u661f\u671f\u51e0<\/li><li>setHours\/getHours<\/li><li>setMinutes\/getMinutes<\/li><li>setSeconds\/getSeconds<\/li><li>setMilliseconds\/getMilliseconds<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4RegExp%E7%B1%BB%E5%9E%8B\"><\/span>4.RegExp\u7c7b\u578b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>ECMAScript\u901a\u8fc7RegExp\u7c7b\u578b\u7c7b\u652f\u6301\u6b63\u5219\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%88%9B%E5%BB%BA%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F\"><\/span>\u521b\u5efa\u6b63\u5219\u8868\u8fbe\u5f0f<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">var expression = \/pattern\/flags;<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\u7684patter\u90e8\u5206\u53ef\u4ee5\u662f\u4efb\u4f55\u7b80\u5355\u6216\u590d\u6742\u7684\u8868\u8fbe\u5f0f\uff0c\u53ef\u4ee5\u5305\u542b\u5b57\u7b26\u7c7b\u3001\u9650\u5b9a\u7b26\u3001\u5206\u7ec4\u3001\u5411\u524d\u67e5\u627e\u4ee5\u53ca\u53cd\u5411\u5f15\u7528\u3002\u6bcf\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u53ef\u4ee5\u5e26\u4e00\u4e2a\u6216\u591a\u4e2aflags\uff0c\u7528\u4ee5\u8868\u660e\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u884c\u4e3a\u3002\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5339\u914d\u6a21\u5f0f\u652f\u6301\u4e0b\u52173\u4e2a\u6807\u5fd7\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><em>g<\/em>\uff1a\u8868\u793a\u5168\u5c40\u6a21\u5f0f\uff0c\u5373\u6a21\u5f0f\u5c06\u88ab\u7528\u4e8e\u6240\u6709\u5b57\u7b26\u4e32\uff0c\u800c\u4e0d\u662f\u5728\u53d1\u73b0\u7b2c\u4e00\u4e2a\u5339\u914d\u9879\u65f6\u7acb\u5373\u505c\u6b62\uff1b<\/li><li><em>i<\/em>\uff1a\u8868\u793a\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff1b<\/li><li><em>m<\/em>\uff1a\u8868\u793a\u591a\u884c\u6a21\u5f0f\uff0c\u5373\u5728\u5230\u8fbe\u4e00\u884c\u672b\u5c3e\u65f6\u8fd8\u4f1a\u7ee7\u7eed\u67e5\u627e\u4e0b\u4e00\u884c\u4e2d\u662f\u5426\u5b58\u5728\u4e0e\u6a21\u5f0f\u76f8\u5339\u914d\u7684\u9879\u3002<\/li><\/ul>\n\n\n\n<p>flags\u53ef\u4ee5\u7701\u7565\u4e0d\u586b\u3002<\/p>\n\n\n\n<p>\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u7684\u6a21\u5f0f\u4e2d\u7684\u6240\u6709\u5143\u5b57\u7b26\u90fd\u8981\u8f6c\u4e49\uff0c\u5143\u5b57\u7b26\u5305\u62ec\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">( [ { \\ ^ $ | ) ? * + . ] }<\/code><\/pre>\n\n\n\n<p>\u6b63\u5219\u8868\u8fbe\u5f0f\u4e5f\u53ef\u4ee5\u901a\u8fc7\u6784\u9020\u51fd\u6570RegExp(pattern, flags)\u6784\u9020\uff0c\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">var pattern2 = new RegExp(\"[bc]at\", \"i\");<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528\u6784\u9020\u51fd\u6570\u521b\u5efa\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u5404\u81ea\u662f\u5355\u72ec\u7684\u5b9e\u4f8b\uff0c\u800c\u901a\u8fc7\u6b63\u5219\u8868\u8fbe\u5f0f\u5b57\u9762\u91cf\u521b\u5efa\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u5982\u679cpattern\u548cflags\u76f8\u540c\uff0c\u90a3\u4e48\u4ed6\u4eec\u4f1a\u5171\u4eab\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">var re = null, i;\nfor (i = 0; i &lt; 10; i++) {\n     re = \/cat\/g;\n     re.test(\"catastrophe\");\n}<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u4f8b\u5b50\u7b2c\u4e8c\u6b21\u8c03\u7528\u65f6\u4f1a\u5931\u8d25\uff0c\u56e0\u4e3are\u59cb\u7ec8\u6307\u5411\u7684\u662f\u7b2c\u4e00\u6b21\u8c03\u7528\u65f6\u6784\u5efa\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u5b9e\u4f8b\uff0c\u6240\u4ee5\u540e\u9762\u7684test\u65b9\u6cd5\u76f8\u5f53\u4e8e\u540c\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u591a\u6b21\u8c03\u7528test\u65b9\u6cd5\uff0c\u5728\u7b2c\u4e00\u6b21\u5339\u914d\u5230cat\u540e\uff0c\u7b2c\u4e8c\u6b21\u8c03\u7528\u5339\u914d\u4e0d\u4e86\u4e86\uff0c\u518d\u4e0b\u4e00\u6b21test\u53c8\u4f1a\u4ece\u5934\u5f00\u59cb\u5339\u914d\u3002\u6240\u4ee5\u4e3a\u4e86\u907f\u514d\u51fa\u73b0\u8fd9\u79cd\u95ee\u9898\uff0c\u6700\u597d\u662f\u4f7f\u7528\u6784\u9020\u51fd\u6570\u521b\u5efa\u6b63\u5219\u8868\u8fbe\u5f0f\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<p><strong>ECMAScript 5\u5219\u89c4\u5b9a\u4f7f\u7528\u5b57\u9762\u91cf\u548c\u76f4\u63a5\u8c03\u7528RegExp\u6784\u9020\u51fd\u6570\u8981\u6709\u76f8\u540c\u7684\u6548\u679c\uff0c\u6bcf\u6b21\u90fd\u521b\u5efa\u65b0\u7684RegExp\u5b9e\u4f8b\u3002<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"RegExp%E5%AE%9E%E4%BE%8B%E5%B1%9E%E6%80%A7\"><\/span>RegExp\u5b9e\u4f8b\u5c5e\u6027<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u6bcf\u4e2aRegExp\u5b9e\u4f8b\u90fd\u6709\u4ee5\u4e0b\u5c5e\u6027\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>global\uff0c\u5e03\u5c14\u503c\uff0c\u8868\u793a\u662f\u5426\u8bbe\u7f6e\u4e86g\u6807\u5fd7\uff1b<\/li><li>ignoreCase\uff0c\u5e03\u5c14\u503c\uff0c\u8868\u793a\u662f\u5426\u8bbe\u7f6e\u4e86i\u6807\u5fd7\uff1b<\/li><li>lastIndex\uff0c\u6574\u6570\uff0c\u8868\u793a\u5f00\u59cb\u641c\u7d22\u4e0b\u4e00\u4e2a\u5339\u914d\u9879\u7684\u5b57\u7b26\u4f4d\u7f6e\uff0c\u4ece0\u7b97\u8d77\uff1b<\/li><li>multiline\uff0c\u5e03\u5c14\u503c\uff0c\u8868\u793a\u662f\u5426\u8bbe\u7f6e\u4e86m\u6807\u5fd7\uff1b<\/li><li>source\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5b57\u7b26\u4e32\u8868\u793a\uff0c\u6309\u7167\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u5f62\u5f0f\u8fd4\u56de\uff1b<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"RegExp%E5%AE%9E%E4%BE%8B%E6%96%B9%E6%B3%95\"><\/span>RegExp\u5b9e\u4f8b\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>exec\u65b9\u6cd5<\/p>\n\n\n\n<p>exec\u65b9\u6cd5\u4e13\u95e8\u4e3a\u6355\u83b7\u7ec4\u800c\u8bbe\u8ba1\uff0c\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\u4e3a\u8981\u5e94\u7528\u6a21\u5f0f\u7684\u5b57\u7b26\u4e32\uff0c\u5982\u679c\u6210\u529f\u5339\u914d\u4e0a\u4e86\u6a21\u5f0f\u5219\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u7b2c\u4e00\u4e2a\u5339\u914d\u9879\u7684\u4fe1\u606f\u7684\u6570\u7ec4\uff0c\u5426\u5219\u8fd4\u56denull\u3002\u8fd4\u56de\u7684\u6570\u7ec4\u867d\u7136\u662fArray\u7684\u5b9e\u4f8b\uff0c\u4f46\u662f\u8fd8\u5305\u542b\u6709index\u548cinput\u4e24\u4e2a\u989d\u5916\u7684\u5c5e\u6027\uff0cindex\u4e3a\u5339\u914d\u9879\u5728\u5b57\u7b26\u4e32\u4e2d\u7684\u4f4d\u7f6e\uff0cinput\u4e3a\u5e94\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5b57\u7b26\u4e32\u3002\u5728\u6570\u7ec4\u4e2d\uff0c\u7b2c\u4e00\u9879\u662f\u4e0e\u6574\u4e2a\u6a21\u5f0f\u5339\u914d\u7684\u5b57\u7b26\u4e32\uff0c\u5176\u4ed6\u9879\u662f\u4e0e\u6a21\u5f0f\u4e2d\u7684\u6355\u83b7\u7ec4\u5339\u914d\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<p>\u8bbe\u7f6e\u5168\u5c40\u6807\u5fd7g\u65f6\uff0c\u6bcf\u6b21\u6267\u884cexec\u65b9\u6cd5\u65f6\u4f1a\u63a5\u7740\u5bfb\u627e\u65b0\u7684\u5339\u914d\u9879(\u4ece\u4e0a\u6b21\u5339\u914d\u9879\u7684\u672b\u5c3e\u5f00\u59cb\u627e)\uff0c\u5e76\u4e14\u627e\u5230\u4e00\u4e2a\u5c31\u8fd4\u56de\u3002\u800c\u4e0d\u8bbe\u7f6e\u5168\u5c40\u6807\u5fd7g\u65f6\uff0c\u8fd4\u56de\u7684\u6c38\u8fdc\u662f\u5b57\u7b26\u4e32\u91cc\u5339\u914d\u5230\u7684\u7b2c\u4e00\u9879\u3002<\/p>\n\n\n\n<p>\u5bf9\u4e8e\/aa\/g\u8fd9\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\uff0caaaaa\u8fd9\u4e2a\u5b57\u7b26\u4e32\u91cc\u53ea\u80fd\u627e\u5230\u4e24\u4e2a\u5339\u914d\u9879\uff0caaaaaa\u53ef\u4ee5\u627e\u5230\u4e09\u4e2a\u5339\u914d\u9879\u3002\u6ca1\u627e\u5230\u5339\u914d\u9879\u5e76\u68c0\u6d4b\u5230\u5b57\u7b26\u4e32\u672b\u5c3e\u65f6\u4f1a\u8fd4\u56denull\uff0c\u7136\u540e\u4e0b\u6b21\u8c03\u7528\u518d\u4ece\u5b57\u7b26\u4e32\u5934\u90e8\u5f00\u59cb\u3002<\/p>\n\n\n\n<p>\u6355\u83b7\u7ec4\u5c31\u662f\u6b63\u5219\u8868\u8fbe\u5f0f\u91cc\u5706\u62ec\u53f7\u5305\u542b\u7684\u90e8\u5206\u3002<\/p>\n\n\n\n<p>test\u65b9\u6cd5<\/p>\n\n\n\n<p>\u6d4b\u8bd5\u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u5b58\u5728\u5339\u914d\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u9879\u3002\u8bbe\u7f6e\u5168\u5c40g\u6807\u5fd7\u65f6\uff0c\u591a\u6b21\u6267\u884c\u4e5f\u662f\u4f1a\u63a5\u7740\u4e0a\u4e00\u6b21\u7684\u4f4d\u7f6e\u7ee7\u7eed\u6d4b\u8bd5\u7684\uff0c\u5230\u672b\u5c3e\u7ed3\u675f\u540e\uff0c\u4e0b\u4e00\u6b21\u8c03\u7528\u53c8\u4ece\u5934\u5f00\u59cb\u3002<\/p>\n\n\n\n<p>\u6b63\u5219\u8868\u8fbe\u5f0f\u7684valueOf\u65b9\u6cd5\u8fd4\u56de\u6b63\u5219\u8868\u8fbe\u5f0f\u672c\u8eab\u3002<\/p>\n\n\n\n<p>RegExp\u6784\u9020\u51fd\u6570\u5c5e\u6027<\/p>\n\n\n\n<p>\u8fd9\u4e9b\u6240\u8c13\u7684RegExp\u6784\u9020\u51fd\u6570\u5c5e\u6027\u76f8\u5f53\u4e8eC++\u4e2d\u7c7b\u7684\u9759\u6001\u5c5e\u6027\uff0c\u4e0d\u5c5e\u4e8e\u67d0\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u800c\u662f\u5c5e\u4e8e\u8fd9\u4e2a\u7c7b\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>\u957f\u5c5e\u6027\u540d<\/strong><\/td><td><strong>\u77ed\u5c5e\u6027\u540d<\/strong><\/td><td><strong>\u8bf4\u660e<\/strong><\/td><\/tr><tr><td>input<\/td><td>$_<\/td><td>\u6700\u8fd1\u4e00\u6b21\u8981\u5339\u914d\u7684\u5b57\u7b26\u4e32<\/td><\/tr><tr><td>lastMatch<\/td><td>$&amp;<\/td><td>\u6700\u8fd1\u4e00\u6b21\u5339\u914d\u9879<\/td><\/tr><tr><td>lastParen<\/td><td>$+<\/td><td>\u6700\u8fd1\u4e00\u6b21\u5339\u914d\u7684\u6355\u83b7\u7ec4<\/td><\/tr><tr><td>leftContext<\/td><td>$`<\/td><td>input\u5b57\u7b26\u4e32\u4e2dlastMatch\u4e4b\u524d\u7684\u6587\u672c<\/td><\/tr><tr><td>multiline<\/td><td>$*<\/td><td>\u5e03\u5c14\u503c\uff0c\u8868\u793a\u662f\u5426\u6240\u6709\u8868\u8fbe\u5f0f\u90fd\u4f7f\u7528\u591a\u884c\u6a21\u5f0f<\/td><\/tr><tr><td>rightContext<\/td><td>$&#8217;<\/td><td>input\u5b57\u7b26\u4e32\u4e2dlastMatch\u4e4b\u540e\u7684\u6587\u672c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u6b64\u5916\u8fd8\u53ef\u4ee5\u7528RegExp.$1\u3001RegExp.$2\u3001&#8230;\u3001RegExp.$9\u8868\u793a\u6700\u8fd1\u4e00\u6b21\u5339\u914d\u64cd\u4f5c\u4e2d9\u4e2a\u5339\u914d\u7684\u6355\u83b7\u7ec4\u3002<\/p>\n\n\n\n<p>ECMAScript\u4e2d\u6b63\u5219\u8868\u8fbe\u5f0f\u4e0d\u652f\u6301\u7684\u7279\u6027<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5339\u914d\u5b57\u7b26\u4e32\u5f00\u59cb\u548c\u7ed3\u675f\u7684\\A\u548c\\Z\u951a(\u4f46\u662f\u652f\u6301\u7528^\u548c$\u6765\u5339\u914d\u5b57\u7b26\u4e32\u5f00\u59cb\u548c\u7ed3\u675f)<\/li><li>\u5411\u540e\u67e5\u627e(lookbehind)\uff0c\u4f46\u662f\u652f\u6301\u5411\u524d\u67e5\u627e(lookahead)<\/li><li>\u5e76\u96c6\u548c\u4ea4\u96c6\u7c7b<\/li><li>\u539f\u5b50\u7ec4(atomic grouping)<\/li><li>Unicode\u652f\u6301(\u5355\u4e2a\u5b57\u7b26\u9664\u5916\uff0c\u5982\\uFFFF)<\/li><li>\u547d\u540d\u7684\u6355\u83b7\u7ec4\uff0c\u4f46\u652f\u6301\u7f16\u53f7\u7684\u6355\u83b7\u7ec4<\/li><li>s(single,\u5355\u884c)\u548cx(free-spacing\uff0c\u65e0\u95f4\u9694)\u5339\u914d\u6a21\u5f0f<\/li><li>\u6761\u4ef6\u5339\u914d<\/li><li>\u6b63\u5219\u8868\u8fbe\u5f0f\u6ce8\u91ca<\/li><\/ul>\n\n\n\n<p>\u5173\u4e8e\u6b63\u5219\u8868\u8fbe\u5f0f\uff1a[^0-9]\u8868\u793a\u975e\u6570\u5b57\u5b57\u7b26\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5Function%E7%B1%BB%E5%9E%8B\"><\/span>5.Function\u7c7b\u578b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6bcf\u4e2a\u51fd\u6570\u90fd\u662fFunction\u5bf9\u8c61\u7684\u5b9e\u4f8b\uff0c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">function sum(num1, num2) {\n    return num1 + num2;\n}\n\nvar sum = function(num1, num2) {\n    return num1 + num2;\n};<\/code><\/pre>\n\n\n\n<p>\u6700\u540e\u4e00\u79cd\u5b9a\u4e49\u51fd\u6570\u7684\u65b9\u5f0f\u662f\u4f7f\u7528Function\u6784\u9020\u51fd\u6570\uff0cFunction\u6784\u9020\u51fd\u6570\u53ef\u4ee5\u63a5\u53d7\u4efb\u610f\u4e2a\u6570\u7684\u53c2\u6570\uff0c\u5e76\u4e14\u6700\u540e\u4e00\u4e2a\u53c2\u6570\u88ab\u770b\u4f5c\u662f\u51fd\u6570\u4f53\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">var sum = new Function(\"num1\", \"num2\", \"return num1 + num2\");<\/code><\/pre>\n\n\n\n<p>\u51fd\u6570\u540d\u548c\u666e\u901a\u5bf9\u8c61\u53d8\u91cf\u540d\u6ca1\u4ec0\u4e48\u533a\u522b\uff0c\u4e5f\u53ef\u4ee5\u8ba9\u51fd\u6570\u540d\u6307\u5411\u5176\u4ed6\u51fd\u6570\u3002\u6240\u4ee5EMCAScript\u4e2d\u6ca1\u6709\u91cd\u8f7d\u7684\u539f\u56e0\u53ef\u4ee5\u7406\u89e3\u4e3a\u5f53\u5b9a\u4e49\u7b2c\u4e8c\u4e2a\u540c\u540d\u51fd\u6570\u65f6\uff0c\u5b9e\u9645\u4e0a\u662f\u8ba9\u540c\u4e00\u4e2a\u51fd\u6570\u540d\u6307\u5411\u4e86\u53e6\u5916\u4e00\u4e2a\u51fd\u6570\u5bf9\u8c61\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%87%BD%E6%95%B0%E5%A3%B0%E6%98%8E%E4%B8%8E%E8%A1%A8%E8%BE%BE%E5%BC%8F\"><\/span>\u51fd\u6570\u58f0\u660e\u4e0e\u8868\u8fbe\u5f0f<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u5bf9\u4e8e\u51fd\u6570\u58f0\u660e\uff0c\u89e3\u6790\u5668\u4f1a\u901a\u8fc7\u51fd\u6570\u58f0\u660e\u63d0\u5347(function declaration hoisting)\u5c06\u51fd\u6570\u58f0\u660e\u63d0\u5347\u5230\u6e90\u4ee3\u7801\u6811\u9876\u7aef\u5e76\u6dfb\u52a0\u5230\u6267\u884c\u73af\u5883\u4e2d\u3002\u56e0\u6b64\u5411\u4e0b\u9762\u7684\u4ee3\u7801\u662f\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\u7684\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">alert(sum(10, 10));\nfunction sum(num1, num2) {\n    return num1 + num2;\n}<\/code><\/pre>\n\n\n\n<p>\u800c\u4e0b\u9762\u7684\u4ee3\u7801\u662f\u4e0d\u884c\u7684\uff0c\u56e0\u4e3a\u8fd9\u4e0d\u662f\u51fd\u6570\u58f0\u660e\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">alert(sum(10, 10));\nvar sum = function(num1, num2) {\n    return num1 + num2;\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u6267\u884c\u5230sum\u7684\u521d\u59cb\u5316\u8fd9\u4e2a\u8bed\u53e5\u4e4b\u524d\uff0csum\u662f\u6ca1\u6709\u5b9a\u4e49\u7684\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%87%BD%E6%95%B0%E5%86%85%E9%83%A8%E5%B1%9E%E6%80%A7\"><\/span>\u51fd\u6570\u5185\u90e8\u5c5e\u6027<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p><em>arguments\u5c5e\u6027<\/em><\/p>\n\n\n\n<p>arguments\u662f\u4e00\u4e2a\u5305\u542b\u4e86\u51fd\u6570\u53c2\u6570\u7684\u7c7b\u6570\u7ec4\u5bf9\u8c61\u3002arguments\u8fd8\u6709\u4e00\u4e2a\u540d\u4e3acallee\u7684\u7279\u6b8a\u5c5e\u6027\uff0c\u6307\u5411\u62e5\u6709arguments\u8fd9\u4e2a\u5bf9\u8c61\u7684\u51fd\u6570\u3002\u901a\u8fc7callee\u8fd9\u4e2a\u5c5e\u6027\u51fd\u6570\u53ef\u4ee5\u5b9e\u73b0\u81ea\u5f15\u7528\uff0c\u5e76\u4e14\u4e0e\u51fd\u6570\u540d\u89e3\u8026\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">function factorial(num) {\n    if (num &lt;= 1) {\n        return 1;\n    } else {\n        return num * arguments.callee(num - 1);\n    }\n}\n\nvar trueFactorial = factorial;\nfactorial = function() { \n    return 0;\n}<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u5728factorial\u6307\u5411\u5176\u4ed6\u51fd\u6570\u540e\uff0ctrueFactorial\u51fd\u6570\u4ecd\u7136\u662f\u4e00\u4e2a\u9636\u4e58\u51fd\u6570\u3002\u800c\u5982\u679c\u5b9a\u4e49factorial\u65f6\u4f7f\u7528\u7684\u4e0b\u9762\u7684\u4ee3\u7801\uff0c\u90a3\u4e48trueFactorial\u5c31\u4e0d\u662f\u4e00\u4e2a\u9636\u4e58\u51fd\u6570\u4e86\uff0c\u56e0\u4e3a\u5b83\u5f15\u7528\u4e86factorial\u51fd\u6570\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">function factorial(num) {\n    if (num &lt;= 1) {\n        return 1;\n    } else {\n        return num * factorial(num - 1);\n    }\n}<\/code><\/pre>\n\n\n\n<p><em>this\u5c5e\u6027<\/em><\/p>\n\n\n\n<p>this\u5f15\u7528\u7684\u662f\u51fd\u6570\u6267\u884c\u7684\u73af\u5883\u5bf9\u8c61\uff0c<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5f53\u5728\u7f51\u9875\u7684\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u8c03\u7528\u51fd\u6570\u65f6\uff0cthis\u5bf9\u8c61\u5f15\u7528\u7684\u5c31\u662fwindow\uff1b<\/li><li>\u5f53\u51fd\u6570\u4f5c\u4e3a\u5bf9\u8c61\u7684\u65b9\u6cd5\u6267\u884c\u65f6\uff0cthis\u5f15\u7528\u7684\u662f\u8fd9\u4e2a\u5bf9\u8c61\uff1b<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">window.color = \"red\";\nvar o = {color: \"blue\"};\n\nfunction sayColor() {\n    alert(this.color);\n}\n\nsayColor();    \/\/ \"red\"\n\no.sayColor = sayColor;\no.sayColor();  \/\/ \"blue\"<\/code><\/pre>\n\n\n\n<p><em>caller\u5c5e\u6027<\/em><\/p>\n\n\n\n<p>ECMAScript 5\u4e2d\u8fd8\u5b9a\u4e49\u4e86caller\u5c5e\u6027\uff0c\u8868\u793a\u4e86\u8c03\u7528\u6b64\u51fd\u6570\u7684\u51fd\u6570\u7684\u5f15\u7528\u3002\u5982\u679c\u662f\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u8c03\u7528\u5f53\u524d\u51fd\u6570\uff0c\u5b83\u7684\u503c\u4e3anull\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">function outer() {\n    inner();\n}\n\nfunction inner() {\n    alert(inner.caller);  \/\/ \u4f1a\u76f4\u63a5\u663e\u793a\u51fd\u6570\u7684\u4ee3\u7801\n}\n\nouter();<\/code><\/pre>\n\n\n\n<p>\u4e25\u683c\u6a21\u5f0f\u4e0b\u4e0d\u80fd\u4e3a\u51fd\u6570\u7684caller\u5c5e\u6027\u8d4b\u503c\uff0c\u5426\u5219\u4f1a\u5bfc\u81f4\u9519\u8bef\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%87%BD%E6%95%B0%E5%B1%9E%E6%80%A7%E5%92%8C%E6%96%B9%E6%B3%95\"><\/span>\u51fd\u6570\u5c5e\u6027\u548c\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li>length\u5c5e\u6027\uff0c\u8868\u793a\u51fd\u6570\u5e0c\u671b\u63a5\u6536\u7684\u53c2\u6570\u7684\u4e2a\u6570\uff1b<\/li><\/ul>\n\n\n\n<ul class=\"wp-block-list\"><li>prototype\u5c5e\u6027\uff0c\u7c7b\u4f3c\u4e8eC++\u4e2d\u7684\u865a\u51fd\u6570\u8868\uff0c\u5728ECMAScript 5\u4e2d\uff0cprototype\u5c5e\u6027\u4e0d\u53ef\u679a\u4e3e\uff0c\u4e0d\u80fd\u7528for-in\u8868\u8fbe\u5f0f\u53d1\u73b0\uff1b<\/li><\/ul>\n\n\n\n<ul class=\"wp-block-list\"><li>apply\u65b9\u6cd5\uff0capply(this, arguments\/[args0, args1, &#8230; ])\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570this\u4e3a\u51fd\u6570\u6307\u5b9athis\u5bf9\u8c61\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3aarguments\u5bf9\u8c61\u6216\u8005\u4e00\u4e2a\u53c2\u6570\u6570\u7ec4\uff1b<\/li><\/ul>\n\n\n\n<ul class=\"wp-block-list\"><li>call\u65b9\u6cd5\uff0ccall(this\uff0cargs0, args1, &#8230;)\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570this\u4e3a\u51fd\u6570\u6307\u5b9athis\u5bf9\u8c61\uff0c\u540e\u9762\u7684\u53c2\u6570\u76f4\u63a5\u4f20\u9012\u7ed9\u51fd\u6570\uff1b<\/li><\/ul>\n\n\n\n<ul class=\"wp-block-list\"><li>bind\u65b9\u6cd5\uff0cbind(this)\uff0c\u521b\u5efa\u4e00\u4e2athis\u503c\u88ab\u7ed1\u5b9a\u5230this\u53c2\u6570\u7684\u51fd\u6570\uff0c\u8ddfC++\u4e2dbind\u4e5f\u5f88\u7c7b\u4f3c\uff1btoLocalString\/toString\/valueOf\uff0c\u59cb\u7ec8\u8fd4\u56de\u51fd\u6570\u7684\u4ee3\u7801\uff1b<\/li><\/ul>\n\n\n\n<p>\u5728\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0c\u672a\u6307\u5b9a\u73af\u5883\u5bf9\u8c61\u800c\u8c03\u7528\u51fd\u6570\uff0c\u5219this\u503c\u4e0d\u4f1a\u8f6c\u6362\u4e3awindow\uff0c\u9664\u975e\u660e\u786e\u628a\u51fd\u6570\u6dfb\u52a0\u5230\u67d0\u4e2a\u5bf9\u8c61\u6216\u8005\u8c03\u7528apply\/call\u65b9\u6cd5\uff0c\u5426\u5219this\u503c\u5c06\u662fundefined\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6%E5%9F%BA%E6%9C%AC%E5%8C%85%E8%A3%85%E7%B1%BB%E5%9E%8B\"><\/span>6.\u57fa\u672c\u5305\u88c5\u7c7b\u578b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>ECMAScript\u4f1a\u5728\u8bfb\u53d6\u57fa\u672c\u7c7b\u578bBoolean\u3001Number\u3001String\u503c\u7684\u65f6\u5019\uff0c\u81ea\u52a8\u521b\u5efa\u76f8\u5e94\u7684\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u4ece\u800c\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u57fa\u672c\u7c7b\u578b\u53d8\u91cf\u8c03\u7528\u76f8\u5e94\u7684\u8282\u672c\u5305\u88c5\u7c7b\u578b\u7684\u65b9\u6cd5\u3002\u57fa\u4e8e\u57fa\u672c\u7c7b\u578b\u81ea\u52a8\u521b\u5efa\u7684\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u7684\u751f\u5b58\u5468\u671f\u53ea\u5728\u4e8e\u8c03\u7528\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u6210\u5458\u65b9\u6cd5\u7684\u90a3\u4e00\u884c\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u8981\u663e\u793a\u5730\u521b\u5efa\u57fa\u672c\u5305\u88c5\u7c7b\u578b\uff0c\u5219\u9700\u8981\u4f7f\u7528new\u8868\u8fbe\u5f0f\u3002\u901a\u8fc7new\u8868\u8fbe\u5f0f\u521b\u5efa\u7684\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u5bf9\u8c61\u8c03\u7528typeof\u4f1a\u8fd4\u56deobject\uff0c\u800c\u4e14\u6240\u6709\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u5bf9\u8c61\u5728\u8f6c\u6362\u4e3a\u5e03\u5c14\u7c7b\u578b\u65f6\u503c\u90fd\u662ftrue\u3002<\/p>\n\n\n\n<p>Object\u6784\u9020\u51fd\u6570\u4e5f\u4f1a\u6839\u636e\u4f20\u5165\u503c\u7684\u7c7b\u578b\u8fd4\u56de\u76f8\u5e94\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u7684\u5b9e\u4f8b\uff0c\u4f20\u5165\u5b57\u7b26\u4e32\uff0c\u5c31\u597d\u8fd4\u56deString\u7684\u5b9e\u4f8b\uff0c\u4f20\u5165\u5e03\u5c14\u503c\u5c31\u4f1a\u8fd4\u56deBoolean\u7684\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<p>\u521b\u5efa\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u7684\u5b9e\u4f8b\u5fc5\u987b\u4f7f\u7528new\u8868\u8fbe\u5f0f\uff0c\u800c\u76f4\u63a5\u8c03\u7528\u540c\u540d\u7684\u8f6c\u578b\u51fd\u6570\u5219\u4f1a\u8fd4\u56de\u57fa\u672c\u7c7b\u578b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">var value = \"25\";\nvar number = Number(value);    \/\/ \u8f6c\u578b\u51fd\u6570\nalert(typeof number);          \/\/ \"number\"\n\nvar obj = new Number(value);   \/\/ \u6784\u9020\u51fd\u6570\nalert(typeof obj);             \/\/ \"object\"<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1Boolean%E7%B1%BB%E5%9E%8B\"><\/span>1.Boolean\u7c7b\u578b<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u56e0\u4e3a\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u90fd\u4f1a\u88ab\u8f6c\u6362\u4e3atrue\uff0c\u6240\u4ee5Boolean\u7c7b\u578b\u5bb9\u6613\u9020\u6210\u6b67\u4e49(Boolean\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u91cc\u5b58\u7684\u662ffalse\uff0c\u4f46\u662f\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u65f6\u8fd4\u56detrue)\uff0c\u6700\u597d\u4e0d\u8981\u4f7f\u7528\u8fd9\u4e2a\u57fa\u672c\u5305\u88c5\u7c7b\u578b\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2Number%E7%B1%BB%E5%9E%8B\"><\/span>2.Number\u7c7b\u578b<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li>toString(base)\uff0c\u6309\u6307\u5b9a\u57fa\u6570\u8fd4\u56de\u51e0\u8fdb\u5236\u6570\u503c\u7684\u5b57\u7b26\u4e32\u5f62\u5f0f\uff1b<\/li><li>toFixed(num)\uff0c\u6307\u5b9a\u5c0f\u6570\u4f4d\u6570\uff1b<\/li><li>toExponential(num)\uff0c\u79d1\u5b66\u8ba1\u6570\u6cd5\uff0c\u5e76\u4e14\u6307\u5b9a\u5c0f\u6570\u4f4d\u6570\uff1b<\/li><li>toPrecision(num)\uff0c\u81ea\u52a8\u9009\u62e9\u5c0f\u6570\u8fd8\u662f\u79d1\u5b66\u8ba1\u6570\u6cd5\uff0c\u5e76\u4e14\u6307\u5b9a\u6570\u5b57\u4f4d\u6570\uff1b<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">        alert(typeof numberObject);   \/\/object\n        alert(typeof numberValue);    \/\/number\n        alert(numberObject instanceof Number);  \/\/true\n        alert(numberValue instanceof Number);   \/\/false<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3String%E7%B1%BB%E5%9E%8B\"><\/span>3.String\u7c7b\u578b<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li>length\u5c5e\u6027\uff0c\u8868\u793a\u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u591a\u5c11\u4e2a\u5b57\u7b26\uff0c\u5373\u4f7f\u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u53cc\u5b57\u8282\u5b57\u7b26\uff0c\u6bcf\u4e2a\u5b57\u7b26\u4e5f\u4ecd\u7136\u7b97\u4f5c\u4e00\u4e2a\u5b57\u7b26\uff1b<\/li><li>char\/charCodeAt\uff0cchar\u8fd4\u56de\u5b57\u7b26\uff0ccharCodeAt\u8fd4\u56de\u5b57\u7b26\u7f16\u7801\uff1b\u4e5f\u53ef\u4ee5\u4f7f\u7528\u65b9\u62ec\u53f7\u7684\u65b9\u5f0f\u8bbf\u95ee\u6307\u5b9a\u4f4d\u7f6e\u7684\u5b57\u7b26\uff1b<\/li><li>concat(str1. str2, &#8230;)\uff0c\u8fde\u63a5\u591a\u4e2a\u5b57\u7b26\uff1b<\/li><li>slice\/substr\/substring\uff0c\u8fd4\u56de\u5b50\u4e32\uff0c\u533a\u522b\u5728\u4e8eslice\u65b9\u6cd5\u4f1a\u5c06\u4f20\u5165\u7684\u8d1f\u503c\u4e0e\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u76f8\u52a0\uff0csubstr\u65b9\u6cd5\u4f1a\u5c06\u8d1f\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u52a0\u4e0a\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff0c\u800c\u5c06\u8d1f\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u8f6c\u6362\u4e3a0\uff0csubstring\u5219\u4f1a\u628a\u6240\u6709\u7684\u8d1f\u503c\u53c2\u6570\u8f6c\u6362\u4e3a0\uff1b\u6b64\u5916substring\u65b9\u6cd5\u4f1a\u5c06\u8f83\u5c0f\u7684\u6570\u4f5c\u4e3a\u5f00\u59cb\u4f4d\u7f6e\uff0c\u8f83\u5927\u7684\u6570\u4f5c\u4e3a\u7ed3\u675f\u4f4d\u7f6e\uff1b<\/li><li>indexOf\/lastIndexOf\uff1b<\/li><li>trim\uff0c\u5220\u9664\u524d\u7f6e\u53ca\u540e\u7f00\u7684\u6240\u6709\u7a7a\u683c\uff1b<\/li><li>toLowerCase\/toLocaleLowerCase\/toUpperCase\/toLocaleUpperCase\uff1b<\/li><\/ul>\n\n\n\n<p>\u5b57\u7b26\u4e32\u7684\u6a21\u5f0f\u5339\u914d\u65b9\u6cd5<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>match(pattern)\uff0c\u63a5\u53d7\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u6548\u679c\u4e0eRegExp\u7684exec\u65b9\u6cd5\u76f8\u540c\uff1b<\/li><li>search(pattern)\uff0c\u8fd4\u56de\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u4e2a\u5339\u914d\u9879\u7684\u7d22\u5f15\uff0c\u5982\u679c\u6ca1\u6709\u627e\u5230\u5339\u914d\u9879\uff0c\u5219\u8fd4\u56de-1\uff1b<\/li><li>replace(pattern\/str, str\/func)\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u6b63\u5219\u8868\u8fbe\u5f0f\u6216\u4e00\u4e2a\u5b57\u7b26\u4e32(\u5b57\u7b26\u4e32\u4e0d\u4f1a\u88ab\u8f6c\u6362\u4e3a\u6b63\u5219\u8868\u8fbe\u5f0f)\uff0c\u5c06\u5b57\u7b26\u4e32\u4e2d\u4e0e\u7b2c\u4e00\u4e2a\u53c2\u6570\u76f8\u5339\u914d\u7684\u5b50\u5b57\u7b26\u4e32\u66ff\u6362\u4e3a\u7b2c\u4e8c\u4e2a\u5b57\u7b26\u4e32\uff1b\u5982\u679c\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u5b57\u7b26\u4e32\uff0c\u90a3\u4e48\u53ea\u4f1a\u66ff\u6362\u5339\u914d\u7684\u7b2c\u4e00\u4e2a\u5b50\u5b57\u7b26\u4e32\uff0c\u5982\u679c\u60f3\u8981\u8fdb\u884c\u5168\u90e8\u66ff\u6362\uff0c\u53ea\u80fd\u4e3a\u7b2c\u4e00\u4e2a\u53c2\u6570\u63d0\u4f9b\u5e26\u5168\u5c40(g)\u6807\u5fd7\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\uff1b<\/li><\/ul>\n\n\n\n<p>replace\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u5b57\u7b26\u4e32\u65f6\uff0c\u652f\u6301\u4e00\u4e9b\u7279\u6b8a\u7684\u5b57\u7b26\u5e8f\u5217\u4ee5\u5f15\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u7684\u7ed3\u679c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u5b57\u7b26\u5e8f\u5217<\/td><td>\u66ff\u6362\u6587\u672c<\/td><\/tr><tr><td>$$<\/td><td>$<\/td><\/tr><tr><td>$&amp;<\/td><td>\u5339\u914d\u6574\u4e2a\u6a21\u5f0f\u7684\u5b50\u5b57\u7b26\u4e32\u3002\u4e0eRegExp.lastMatch\u7684\u503c\u76f8\u540c<\/td><\/tr><tr><td>$&#8217;<\/td><td>\u5339\u914d\u7684\u5b50\u5b57\u7b26\u4e32\u4e4b\u524d\u7684\u5b50\u5b57\u7b26\u4e32\u3002\u4e0eRegExp.leftContext\u76f8\u540c<\/td><\/tr><tr><td>$`<\/td><td>\u5339\u914d\u7684\u5b50\u5b57\u7b26\u4e32\u4e4b\u540e\u7684\u5b50\u5b57\u7b26\u4e32\u3002\u4e0eRegExp.rightContext\u76f8\u540c<\/td><\/tr><tr><td>$n<\/td><td>\u5339\u914d\u7b2cn\u4e2a\u6355\u83b7\u7ec4\u7684\u5b50\u5b57\u7b26\u4e32\uff0c\u5176\u4e2dn\u7b49\u4e8e0~9\u3002$1\u662f\u5339\u914d\u7b2c\u4e00\u4e2a\u6355\u83b7\u7ec4\u7684\u5b50\u5b57\u7b26\u4e32\u3002\u5982\u679c\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u6ca1\u6709\u5b9a\u4e49\u6355\u83b7\u7ec4\uff0c\u5219\u4f7f\u7528\u7a7a\u5b57\u7b26\u4e32<\/td><\/tr><tr><td>$nn<\/td><td>\u5339\u914d\u7b2cnn\u4e2a\u6355\u83b7\u7ec4\u7684\u5b50\u5b57\u7b26\u4e32\u3002\u4e0e$n\u7c7b\u4f3c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>replace\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e5f\u53ef\u4ee5\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u7528\u4ee5\u52a8\u6001\u51b3\u5b9a\u8981\u5c06\u7b2c\u4e00\u4e2a\u53c2\u6570\u7684\u5339\u914d\u9879\u66ff\u6362\u4e3a\u4ec0\u4e48\u6837\u7684\u5b57\u7b26\u4e32\u3002\u5728\u53ea\u6709\u4e00\u4e2a\u5339\u914d\u9879\u7684\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e2a\u51fd\u6570\u4f1a\u63a5\u65363\u4e2a\u53c2\u6570\uff1a\u6a21\u5f0f\u7684\u5339\u914d\u9879\u3001\u6a21\u5f0f\u5339\u914d\u9879\u5728\u5b57\u7b26\u4e32\u4e2d\u7684\u4f4d\u7f6e\u548c\u539f\u59cb\u5b57\u7b26\u4e32\u3002\u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u5b9a\u4e49\u4e86\u591a\u4e2a\u6355\u83b7\u7ec4\u7684\u60c5\u51b5\u4e0b\uff0c\u4f20\u9012\u7ed9\u51fd\u6570\u7684\u53c2\u6570\u4f9d\u6b21\u662f\u6a21\u5f0f\u7684\u5339\u914d\u9879\u3001\u7b2c\u4e00\u4e2a\u6355\u83b7\u7ec4\u7684\u5339\u914d\u9879\u3001\u7b2c\u4e8c\u4e2a\u6355\u83b7\u7ec4\u7684\u5339\u914d\u9879&#8230;\uff0c\u4f46\u6700\u540e\u4e24\u4e2a\u53c2\u6570\u4ecd\u7136\u662f\u6a21\u5f0f\u7684\u5339\u914d\u9879\u5728\u5b57\u7b26\u4e32\u4e2d\u7684\u4f4d\u7f6e\u548c\u539f\u59cb\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>split\u65b9\u6cd5\uff0csplit(regexp\/str, length)\uff1b\u57fa\u4e8e\u6307\u5b9a\u7684\u5206\u9694\u7b26(\u6b63\u5219\u8868\u8fbe\u5f0f\u6216\u8005\u5b57\u7b26\u4e32)\u5c06\u5b57\u7b26\u4e32\u5212\u5206\u4e3a\u591a\u4e2a\u5b50\u5b57\u7b26\u4e32\u5e76\u5b58\u653e\u5728\u6570\u7ec4\u4e2d\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u53ef\u9009\uff0c\u7528\u4ee5\u6307\u5b9a\u7ed3\u679c\u6570\u7ec4\u7684\u5927\u5c0f\uff1b<\/li><li>localeCompare\u65b9\u6cd5\uff1b<\/li><li>fromCharCode\u65b9\u6cd5\uff0c\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5\uff0c\u63a5\u6536\u591a\u4e2a\u5b57\u7b26\u7f16\u7801\uff0c\u7136\u540e\u5c06\u5b83\u4eec\u8f6c\u6362\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\uff1b<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">alert(String.fromCharCode(104, 101, 108, 108, 111)); \/\/ \"hello\"<\/code><\/pre>\n\n\n\n<p>HTML\u683c\u5f0f\u5316\u65b9\u6cd5<\/p>\n\n\n\n<p>\u6d4f\u89c8\u5668\u8fd8\u63d0\u4f9b\u4e86\u57fa\u4e8e\u7ed9\u5b9a\u5b57\u7b26\u4e32\u5feb\u901f\u521b\u5efaHTML\u6807\u7b7e\u7684\u65b9\u6cd5<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>\u65b9\u6cd5<\/strong><\/td><td><strong>\u8f93\u51fa\u7ed3\u679c<\/strong><\/td><\/tr><tr><td>anchor(name)<\/td><td><\/td><\/tr><tr><td>big<\/td><td><\/td><\/tr><tr><td>bold<\/td><td><\/td><\/tr><tr><td>fixed<\/td><td><\/td><\/tr><tr><td>fontcolor<\/td><td><\/td><\/tr><tr><td>fontsize<\/td><td><\/td><\/tr><tr><td>italics<\/td><td><\/td><\/tr><tr><td>link(url)<\/td><td><\/td><\/tr><tr><td>small<\/td><td><\/td><\/tr><tr><td>strike<\/td><td><\/td><\/tr><tr><td>sub<\/td><td><\/td><\/tr><tr><td>sup<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"7%E5%8D%95%E4%BD%93%E5%86%85%E7%BD%AE%E5%AF%B9%E8%B1%A1\"><\/span>7.\u5355\u4f53\u5185\u7f6e\u5bf9\u8c61<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>ECMA-262\u5bf9\u5185\u7f6e\u5bf9\u8c61\u7684\u5b9a\u4e49\uff1a\u7531ECMAScript\u5b9e\u73b0\u63d0\u4f9b\u7684\u3001\u4e0d\u4f9d\u8d56\u4e8e\u5bbf\u4e3b\u73af\u5883\u7684\u5bf9\u8c61\uff0c\u8fd9\u4e9b\u5bf9\u8c61\u5728ECMAScript\u7a0b\u5e8f\u6267\u884c\u4e4b\u524d\u5c31\u5df2\u7ecf\u5b58\u5728\u4e86\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Global%E5%AF%B9%E8%B1%A1\"><\/span>Global\u5bf9\u8c61<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u7ec8\u6781\u7684\u515c\u5e95\u513f\u5bf9\u8c61\uff0c\u4e0d\u5c5e\u4e8e\u4efb\u4f55\u5176\u4ed6\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u6700\u7ec8\u90fd\u662fglobal\u8fd9\u4e2a\u201c\u5bf9\u8c61\u201d\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>isNaN<\/li><li>isFinite<\/li><li>parseInt<\/li><li>parseFloat<\/li><\/ul>\n\n\n\n<p>1.URI\u7f16\u7801\u65b9\u6cd5<\/p>\n\n\n\n<p><strong>encodeURI<\/strong>\u548c<strong>encodeURIComponent<\/strong>\u65b9\u6cd5\u53ef\u4ee5\u5bf9URI\u8fdb\u884c\u7f16\u7801\u3002encodeURI\u4e3b\u8981\u7528\u4e8e\u5bf9\u6574\u4e2aURI\u7f16\u7801\uff0c\u800cencodeURIComponent\u4e3b\u8981\u7528\u4e8e\u5bf9URI\u4e2d\u7684\u67d0\u4e00\u6bb5\u8fdb\u884c\u7f16\u7801\uff0c\u4ed6\u4eec\u7684\u533a\u522b\u5728\u4e8eencodeURI\u4e0d\u4f1a\u5bf9\u672c\u8eab\u5c5e\u4e8eURI\u7684\u7279\u6b8a\u5b57\u7b26\u8fdb\u884c\u7f16\u7801\uff0c\u5982\u5192\u53f7\u3001\u6b63\u659c\u6760\u3001\u95ee\u53f7\u548c\u4e95\u5b57\u53f7\uff1b\u800cencodeURIComponent\u5219\u4f1a\u5bf9\u5b83\u53d1\u73b0\u7684\u4efb\u4f55\u975e\u6807\u51c6\u5b57\u7b26\u8fdb\u884c\u7f16\u7801\u3002<\/p>\n\n\n\n<p>encodeURI\u5bf9\u9664\u4e86\u7a7a\u683c\u4e4b\u5916\u7684\u5176\u4ed6\u5b57\u7b26\u90fd\u539f\u5c01\u4e0d\u52a8\uff0c\u53ea\u6709\u7a7a\u683c\u88ab\u66ff\u6362\u4e3a%20\uff0c\u800cencodeURIComponent\u4f1a\u66ff\u6362\u6240\u6709\u7684\u975e\u5b57\u6bcd\u6570\u5b57\u5b57\u7b26\u3002\u6240\u4ee5\u53ef\u4ee5\u5bf9\u6574\u4e2aURI\u4f7f\u7528encodeURI\uff0c\u4f46\u662f\u53ea\u80fd\u5bf9\u9644\u52a0\u5728URI\u540e\u9762\u7684\u5b57\u7b26\u4e32\u4f7f\u7528encodeURIComponent\u3002<\/p>\n\n\n\n<p>\u5bf9\u5e94\u7684\u8fd8\u6709\u4e24\u4e2a\u89e3\u7801\u65b9\u6cd5<strong>decodeURI<\/strong>\u548c<strong>decodeURIComponent<\/strong>\u3002<\/p>\n\n\n\n<p>2.eval\u65b9\u6cd5<\/p>\n\n\n\n<p>eval\u65b9\u6cd5\u63a5\u53d7\u8868\u793a\u8981\u6267\u884c\u4ee3\u7801\u7684\u5b57\u7b26\u4e32\u5e76\u6267\u884c\u8fd9\u6bb5\u4ee3\u7801\u3002\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0c\u5728\u5916\u90e8\u8bbf\u95ee\u4e0d\u5230eval()\u4e2d\u521b\u5efa\u7684\u4efb\u4f55\u53d8\u91cf\u6216\u51fd\u6570\u3002<\/p>\n\n\n\n<p>3.Global\u5bf9\u8c61\u7684\u5c5e\u6027<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u5c5e\u6027<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>undefined<\/td><td><\/td><\/tr><tr><td>NaN<\/td><td><\/td><\/tr><tr><td>Infinity<\/td><td><\/td><\/tr><tr><td>Object<\/td><td><\/td><\/tr><tr><td>Array<\/td><td><\/td><\/tr><tr><td>Function<\/td><td><\/td><\/tr><tr><td>Boolean<\/td><td><\/td><\/tr><tr><td>String<\/td><td><\/td><\/tr><tr><td>Number<\/td><td><\/td><\/tr><tr><td>Date<\/td><td><\/td><\/tr><tr><td>RegExp<\/td><td><\/td><\/tr><tr><td>Error<\/td><td><\/td><\/tr><tr><td>EvalError<\/td><td><\/td><\/tr><tr><td>RangeError<\/td><td><\/td><\/tr><tr><td>ReferenceError<\/td><td><\/td><\/tr><tr><td>SyntaxError<\/td><td><\/td><\/tr><tr><td>TypeError<\/td><td><\/td><\/tr><tr><td>URIError<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>4.window\u5bf9\u8c61<\/p>\n\n\n\n<p>web\u6d4f\u89c8\u5668\u90fd\u662f\u5c06Global\u8fd9\u4e2a&#8221;\u5bf9\u8c61&#8221;\u5f53\u505awindow\u5bf9\u8c61\u7684\u4e00\u90e8\u5206\u52a0\u4ee5\u5b9e\u73b0\u7684\u3002\u56e0\u6b64\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u58f0\u660e\u7684\u6240\u6709\u53d8\u91cf\u548c\u51fd\u6570\uff0c\u5c31\u90fd\u6210\u4e3a\u4e86window\u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/p>\n\n\n\n<p>\u9664\u4e86window\u5bf9\u8c61\uff0c\u53e6\u5916\u4e00\u79cd\u83b7\u53d6Global\u5bf9\u8c61\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">var global = function() {\n    return this;\n}<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Math%E5%AF%B9%E8%B1%A1\"><\/span>Math\u5bf9\u8c61<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>1.Math\u5bf9\u8c61\u7684\u5c5e\u6027<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u5c5e\u6027<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>Math.E<\/td><td><\/td><\/tr><tr><td>Math.LN10<\/td><td><\/td><\/tr><tr><td>Math.LN2<\/td><td><\/td><\/tr><tr><td>Math.LOG2E<\/td><td><\/td><\/tr><tr><td>Math.LOG10E<\/td><td><\/td><\/tr><tr><td>Math.PI<\/td><td><\/td><\/tr><tr><td>Math.SQRT1_2<\/td><td><\/td><\/tr><tr><td>Math.SQRT2<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>2.min\u548cmax\u65b9\u6cd5<\/p>\n\n\n\n<p>min\u548cmax\u65b9\u6cd5\u53ef\u4ee5\u63a5\u6536\u591a\u4e2a\u53c2\u6570\u5e76\u6c42\u51fa\u6700\u5c0f\u6216\u8005\u6700\u5927\u503c\u3002<\/p>\n\n\n\n<p>3.\u820d\u5165\u65b9\u6cd5<\/p>\n\n\n\n<p>ceil\/floor\/round(\u56db\u820d\u4e94\u5165)<\/p>\n\n\n\n<p>4.random\u65b9\u6cd5<\/p>\n\n\n\n<p>\u8fd4\u56de\u5927\u4e8e\u7b49\u4e8e0\u5c0f\u4e8e1\u7684\u4e00\u4e2a\u968f\u673a\u6570\u3002<\/p>\n\n\n\n<p>5.\u5176\u4ed6\u65b9\u6cd5<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u65b9\u6cd5<\/td><td>\u8bf4\u660e<\/td><\/tr><tr><td>Math.abs<\/td><td><\/td><\/tr><tr><td>Math.exp<\/td><td><\/td><\/tr><tr><td>Math.log<\/td><td><\/td><\/tr><tr><td>Math.pow(num, power)<\/td><td><\/td><\/tr><tr><td>Math.sqrt<\/td><td><\/td><\/tr><tr><td>Math.acos<\/td><td><\/td><\/tr><tr><td>Math.asin<\/td><td><\/td><\/tr><tr><td>Math.atan<\/td><td><\/td><\/tr><tr><td>Math.atan2(y, x)<\/td><td><\/td><\/tr><tr><td>Math.cos<\/td><td><\/td><\/tr><tr><td>Math.sin<\/td><td><\/td><\/tr><tr><td>Math.tan<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>\u7b2c4\u7ae0 \u53d8\u91cf\u3001\u4f5c\u7528\u57df\u548c\u5185\u5b58\u95ee\u9898 1.\u57fa\u672c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b\u7684\u503c Undefined\uff0cNull\uff0cBoolean\uff0cNumber\u548cString\u662f\u57fa\u672c\u7c7b\u578b\uff0c\u4ed6\u4eec\u662f\u6309\u503c\u8bbf\u95ee\u7684\uff0c\u53ef\u4ee5\u64cd\u4f5c\u4fdd\u5b58\u5728\u53d8\u91cf\u4e2d\u7684\u5b9e\u9645\u7684\u503c\u3002 \u57fa\u672c&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,6],"tags":[166],"class_list":["post-1394","post","type-post","status-publish","format-standard","hentry","category-10","category-6","tag-professionaljavascript"],"_links":{"self":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/1394","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1394"}],"version-history":[{"count":28,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/1394\/revisions"}],"predecessor-version":[{"id":1453,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/1394\/revisions\/1453"}],"wp:attachment":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1394"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1394"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1394"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}