{"id":2997,"date":"2018-02-24T15:19:49","date_gmt":"2018-02-24T07:19:49","guid":{"rendered":"http:\/\/www.daliane.com\/?p=2997"},"modified":"2018-02-24T15:19:49","modified_gmt":"2018-02-24T07:19:49","slug":"30_fen_zhong_kuai_su_shang_shou_es6_xia","status":"publish","type":"post","link":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/30_fen_zhong_kuai_su_shang_shou_es6_xia\/","title":{"rendered":"30\u5206\u949f\u5feb\u901f\u4e0a\u624bES6\uff08\u4e0b\uff09"},"content":{"rendered":"<h3 id=\"iterators-for..of-\u8fed\u4ee3\u5668-for..of-\u5faa\u73af\" style=\"font-size:16px;font-family:Verdana, Arial, Helvetica, sans-serif;\">\n\tIterators + For..Of \u8fed\u4ee3\u5668 + For..of \u5faa\u73af<br \/>\n<\/h3>\n<div>\n<p><h4>\n\t\t\t\t1\uff09for\u5faa\u73af\u7684\u7591\u95ee<br \/>\n\t\t\t<\/h4>\n<\/p>\n<p>\n\t\t\t\t\u8d77\u521d\u6211\u4eec\u5982\u4f55\u904d\u5386\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u5462\uff1f20\u5e74\u524dJavaScript\u521a\u840c\u751f\u65f6\uff0c\u4f60\u53ef\u80fd\u8fd9\u6837\u5b9e\u73b0\u6570\u7ec4\u904d\u5386\uff1a\n\t\t\t<\/p>\n<pre class=\"hljs javascript\"><span class=\"hljs-keyword\">var<\/span> myArray = [<span class=\"hljs-string\">'2'<\/span>,<span class=\"hljs-string\">'3'<\/span>,<span class=\"hljs-string\">'aaa'<\/span>]; <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">var<\/span> index = <span class=\"hljs-number\">0<\/span>; index &lt; myArray.length; index++) { <span class=\"hljs-built_in\">console<\/span>.log(myArray[index]);\r\n}<\/pre>\n<p>\n\t\t\t\t\u81eaES5\u6b63\u5f0f\u53d1\u5e03\u540e\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u5185\u5efa\u7684forEach\u65b9\u6cd5\u6765\u904d\u5386\u6570\u7ec4\uff1a\n\t\t\t<\/p>\n<pre class=\"hljs javascript\">myArray.forEach(<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> (<span class=\"hljs-params\">value<\/span>) <\/span>{ <span class=\"hljs-built_in\">console<\/span>.log(value);\r\n});<\/pre>\n<p>\n\t\t\t\t\u4f7f\u7528forEach\u7684\u8fd9\u6bb5\u4ee3\u7801\u770b\u8d77\u6765\u66f4\u52a0\u7b80\u6d01\uff0c\u4f46\u8fd9\u79cd\u65b9\u6cd5\u4e5f\u6709\u4e00\u4e2a\u5c0f\u7f3a\u9677\uff1a\u4f60\u4e0d\u80fd\u4f7f\u7528break\u8bed\u53e5\u4e2d\u65ad\u5faa\u73af\uff0c\u4e5f\u4e0d\u80fd\u4f7f\u7528return\u8bed\u53e5\u8fd4\u56de\u5230\u5916\u5c42\u51fd\u6570\u3002<br \/>\n\u662f\u4e0d\u662f\u5462\uff1f\u4f60\u4eec\u53ef\u4ee5\u8fdb\u884c\u76f8\u5173\u7684\u9a8c\u8bc1\uff0c\u540c\u65f6\u5462\u5b83\u5728\u6d4f\u89c8\u5668\u517c\u5bb9\u4e0e\u652f\u6301\u65b9\u9762\u5e76\u4e0d\u7406\u60f3\uff0c\u6240\u4ee5\u6211\u4eec\u4f1a\u60f3\u8d77for\u5faa\u73af\u6765\u3002<br \/>\n\u5f53\u7136\uff0c\u5982\u679c\u53ea\u7528for\u5faa\u73af\u7684\u8bed\u6cd5\u6765\u904d\u5386\u6570\u7ec4\u5143\u7d20\u4e5f\u5f88\u4e0d\u9519\uff0c\u5c31\u5982\u4e0a\u9762\u7684\u7b2c\u4e00\u4e2a\u4f8b\u5b50\u3002<br \/>\n\u90a3\u4e48\uff0c\u4f60\u4e00\u5b9a\u60f3\u5c1d\u8bd5\u4e00\u4e0bfor-in\u5faa\u73af\uff1a\n\t\t\t<\/p>\n<pre class=\"hljs javascript\"><span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">var<\/span> index <span class=\"hljs-keyword\">in<\/span> myArray) { <span class=\"hljs-comment\">\/\/ \u5343\u4e07\u522b\u8fd9\u6837\u505a<\/span> <span class=\"hljs-built_in\">console<\/span>.log(myArray[index]);\r\n}<\/pre>\n<p>\n\t\t\t\t\u8fd9\u7edd\u5bf9\u662f\u4e00\u4e2a\u7cdf\u7cd5\u7684\u9009\u62e9\uff0c\u4e3a\u4ec0\u4e48\u5462\uff1f\n\t\t\t<\/p>\n<blockquote>\n<ol>\n<li>\n\t\t\t\t\t\t\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u8d4b\u7ed9index\u7684\u503c\u4e0d\u662f\u5b9e\u9645\u7684\u6570\u5b57\uff0c\u800c\u662f\u5b57\u7b26\u4e32\u201c0\u201d\u3001\u201c1\u201d\u3001\u201c2\u201d\uff0c\u800c\u4f60\u5462\uff1f\u6b64\u65f6\u5f88\u53ef\u80fd\u5728\u65e0\u610f\u4e4b\u95f4\u9700\u8981\u8fdb\u884c\u76f8\u5173\u8ba1\u7b97\uff0c\u4f46\u8fd9\u662f\u8fd9\u4e0d\u662f\u6570\u503c\u7684\u8ba1\u7b97\u4e86\uff0c\u800c\u662f\u5b57\u7b26\u4e32\u7b97\u6570\u8ba1\u7b97\uff0c\u4f8b\u5982\uff1a\u201c2\u201d + 1 == \u201c21\u201d\uff0c\u8fd9\u7ed9\u7f16\u7801\u8fc7\u7a0b\u5e26\u6765\u6781\u5927\u7684\u4e0d\u4fbf\u3002\n\t\t\t\t\t<\/li>\n<\/ol>\n<\/blockquote>\n<ol>\n<li>\n\t\t\t\t\t\u4f5c\u7528\u4e8e\u6570\u7ec4\u7684for-in\u5faa\u73af\u4f53\u9664\u4e86\u904d\u5386\u6570\u7ec4\u5143\u7d20\u5916\uff0c\u8fd8\u4f1a\u904d\u5386\u81ea\u5b9a\u4e49\u5c5e\u6027\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5982\u679c\u4f60\u7684\u6570\u7ec4\u4e2d\u6709\u4e00\u4e2a\u53ef\u679a\u4e3e\u5c5e\u6027myArray.name\uff0c\u5faa\u73af\u5c06\u989d\u5916\u6267\u884c\u4e00\u6b21\uff0c\u904d\u5386\u5230\u540d\u4e3a\u201cname\u201d\u7684\u7d22\u5f15\u3002\u5c31\u8fde\u6570\u7ec4\u539f\u578b\u94fe\u4e0a\u7684\u5c5e\u6027\u90fd\u80fd\u88ab\u8bbf\u95ee\u5230\u3002\n\t\t\t\t<\/li>\n<li>\n\t\t\t\t\t\u6700\u8ba9\u4eba\u9707\u60ca\u7684\u662f\uff0c\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u8fd9\u6bb5\u4ee3\u7801\u53ef\u80fd\u6309\u7167\u968f\u673a\u987a\u5e8f\u904d\u5386\u6570\u7ec4\u5143\u7d20\u3002\n\t\t\t\t<\/li>\n<li>\n\t\t\t\t\t\u7b80\u800c\u8a00\u4e4b\uff0cfor-in\u662f\u4e3a\u666e\u901a\u5bf9\u8c61\u8bbe\u8ba1\u7684\uff0c\u4f60\u53ef\u4ee5\u904d\u5386\u5f97\u5230\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u952e\uff0c\u56e0\u6b64\u4e0d\u9002\u7528\u4e8e\u6570\u7ec4\u904d\u5386\u3002\n\t\t\t\t<\/li>\n<\/ol>\n<p>\n\t\t\t\t\u5176\u5b9e\u5570\u91cc\u5570\u5506\u8bf4\u4e86\u8fd9\u4e48\u591a\u4f60\u5c31\u8bb0\u4f4f\u4e00\u53e5\u8bdd\uff1afor-in\u662f\u7528\u4e8e\u904d\u5386\u5bf9\u8c61\u7684\uff0c\u666e\u901afor\u5faa\u73af\u548cforEach\u662f\u904d\u5386\u666e\u901a\u6570\u7ec4\u7684\u3002<br \/>\n\u5982\u679c\u6709\u5929\u4f60\u60f3\u8981\u904d\u5386\u5bf9\u8c61\u53c8\u8981\u5f97\u5230\u5b83\u7684\u952e\u503c\uff0c\u8fd9\u91cc\u4e3e\u4f8b\u8bf4\u660e\uff1a\n\t\t\t<\/p>\n<pre class=\"hljs javascript\"><span class=\"hljs-keyword\">var<\/span> obj = { <span class=\"hljs-string\">'name'<\/span>: <span class=\"hljs-string\">'\u8a00\u58a8\u513f'<\/span>, <span class=\"hljs-string\">'age'<\/span>: <span class=\"hljs-number\">21<\/span> }; <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-built_in\">Object<\/span>.keys(obj)) <span class=\"hljs-comment\">\/\/ \u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u6570\u7ec4<\/span> <span class=\"hljs-comment\">\/\/ \u4e0d\u63a8\u8350for-in<\/span> <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">var<\/span> val <span class=\"hljs-keyword\">in<\/span> <span class=\"hljs-built_in\">Object<\/span>.keys(obj)) { <span class=\"hljs-built_in\">console<\/span>.log(val); <span class=\"hljs-comment\">\/\/ \u83b7\u5f97\u952e\u503ckey-\u5b57\u7b26\u4e32<\/span> <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-built_in\">Object<\/span>.keys(obj)[val]); <span class=\"hljs-comment\">\/\/ name\u3001age-(\u83b7\u5f97\u952e\u503ckey\u5bf9\u5e94\u7684\u6570\u636e)<\/span> } <span class=\"hljs-comment\">\/\/ \u63a8\u8350for\u5faa\u73af<\/span> <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">var<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-built_in\">Object<\/span>.keys(obj).length; i++) { <span class=\"hljs-built_in\">console<\/span>.log(i); <span class=\"hljs-comment\">\/\/ \u83b7\u5f97\u952e\u503ckey-\u6570\u5b57<\/span> <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-built_in\">Object<\/span>.keys(obj)[i]); <span class=\"hljs-comment\">\/\/ name\u3001age-(\u83b7\u5f97\u952e\u503ckey\u5bf9\u5e94\u7684\u6570\u636e)<\/span> }<\/pre>\n<h4>\n\t\t\t\t\uff082\uff09\u5f3a\u5927\u7684for-of\u5faa\u73af<br \/>\n\t\t\t<\/h4>\n<p>\n\t\t\t\t\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u6240\u4ee5\u65b0\u7684\u5faa\u73af\u65b9\u5f0f\u5728ES6\u4e2d\u51fa\u73b0\u4e86\uff0c\u5f53\u7136ES6\u4e0d\u4f1a\u7834\u574f\u4f60\u5df2\u7ecf\u5199\u597d\u7684JS\u4ee3\u7801\u3002\u76ee\u524d\uff0c\u6210\u5343\u4e0a\u4e07\u7684Web\u7f51\u7ad9\u4f9d\u8d56for-in\u5faa\u73af\uff0c\u5176\u4e2d\u4e00\u4e9b\u7f51\u7ad9\u751a\u81f3\u5c06\u5176\u7528\u4e8e\u6570\u7ec4\u904d\u5386\u3002\u800c\u5982\u679c\u60f3\u901a\u8fc7\u4fee\u6b63for-in\u5faa\u73af\u589e\u52a0\u6570\u7ec4\u904d\u5386\u652f\u6301\u4f1a\u8ba9\u8fd9\u4e00\u5207\u53d8\u5f97\u66f4\u52a0\u6df7\u4e71\uff0c\u56e0\u6b64\uff0c\u6807\u51c6\u59d4\u5458\u4f1a\u5728ES6\u4e2d\u589e\u52a0\u4e86\u4e00\u79cd\u65b0\u7684\u5faa\u73af\u8bed\u6cd5\u6765\u89e3\u51b3\u76ee\u524d\u7684\u95ee\u9898\u3002<br \/>\n\u5c31\u50cf\u8fd9\u6837\uff1a\n\t\t\t<\/p>\n<pre class=\"hljs javascript\"><span class=\"hljs-comment\">\/\/ for-of\u5faa\u73af\u652f\u6301\u6570\u7ec4\u904d\u5386\u548c\u5927\u591a\u6570\u7c7b\u6570\u7ec4\u5bf9\u8c61<\/span> <span class=\"hljs-keyword\">var<\/span> myArray = [<span class=\"hljs-string\">'2'<\/span>,<span class=\"hljs-string\">'3'<\/span>,<span class=\"hljs-string\">'aaa'<\/span>] <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">var<\/span> value <span class=\"hljs-keyword\">of<\/span> myArray) { <span class=\"hljs-built_in\">console<\/span>.log(value); <span class=\"hljs-comment\">\/\/ 2\uff0c3\uff0caaa<\/span> }<\/pre>\n<p>\n\t\t\t\t\u662f\u7684\uff0c\u4e0e\u4e4b\u524d\u7684\u5185\u5efa\u65b9\u6cd5\u76f8\u6bd4\uff0c\u8fd9\u79cd\u5faa\u73af\u65b9\u5f0f\u770b\u8d77\u6765\u662f\u5426\u6709\u4e9b\u773c\u719f\uff1f\u90a3\u597d\uff0c\u6211\u4eec\u5c06\u8981\u63a2\u7a76\u4e00\u4e0bfor-of\u5faa\u73af\u7684\u5916\u8868\u4e0b\u9690\u85cf\u7740\u54ea\u4e9b\u5f3a\u5927\u7684\u529f\u80fd\u3002\u73b0\u5728\uff0c\u4f60\u53ea\u9700\u8bb0\u4f4f\uff1a\n\t\t\t<\/p>\n<blockquote>\n<ol>\n<li>\n\t\t\t\t\t\t\u8fd9\u662f\u6700\u7b80\u6d01\u3001\u6700\u76f4\u63a5\u7684\u904d\u5386\u6570\u7ec4\u5143\u7d20\u7684\u8bed\u6cd5\n\t\t\t\t\t<\/li>\n<\/ol>\n<\/blockquote>\n<ol>\n<li>\n\t\t\t\t\t\u8fd9\u4e2a\u65b9\u6cd5\u907f\u5f00\u4e86for-in\u5faa\u73af\u7684\u6240\u6709\u7f3a\u9677\n\t\t\t\t<\/li>\n<li>\n\t\t\t\t\t\u4e0eforEach()\u4e0d\u540c\u7684\u662f\uff0c\u5b83\u53ef\u4ee5\u6b63\u786e\u54cd\u5e94break\u3001continue\u548creturn\u8bed\u53e5\n\t\t\t\t<\/li>\n<\/ol>\n<p>\n\t\t\t\t\u8868\u9762\u770b\u6765for-in\u5faa\u73af\u7528\u6765\u904d\u5386\u5bf9\u8c61\u5c5e\u6027\uff0cfor-of\u5faa\u73af\u7528\u6765\u904d\u5386\u6570\u636e\u2014\u4f8b\u5982\u6570\u7ec4\u4e2d\u7684\u503c\u3002\u4f46\u662f\uff0cfor-of\u4e0d\u4ec5\u5982\u6b64\uff01<br \/>\nfor-of\u5faa\u73af\u4e5f\u53ef\u4ee5\u904d\u5386\u5176\u5b83\u7684\u96c6\u5408\uff0cfor-of\u5faa\u73af\u4e0d\u4ec5\u652f\u6301\u6570\u7ec4\uff0c\u8fd8\u652f\u6301\u5927\u591a\u6570\u7c7b\u6570\u7ec4\u5bf9\u8c61\uff0c\u4f8b\u5982DOM NodeList\u5bf9\u8c61\u3002\u540c\u65f6\uff0cfor-of\u5faa\u73af\u4e5f\u652f\u6301\u5b57\u7b26\u4e32\u904d\u5386\uff0c\u5b83\u5c06\u5b57\u7b26\u4e32\u89c6\u4e3a\u4e00\u7cfb\u5217\u7684Unicode\u5b57\u7b26\u6765\u8fdb\u884c\u904d\u5386\uff1a\n\t\t\t<\/p>\n<pre class=\"hljs javascript\"><span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">var<\/span> chr <span class=\"hljs-keyword\">of<\/span> <span class=\"hljs-string\">\"yanmoer\"<\/span>) { <span class=\"hljs-built_in\">console<\/span>.log (chr); <span class=\"hljs-comment\">\/\/ y,a,n,m,o,e,r<\/span> }<\/pre>\n<p>\n\t\t\t\t\u5b83\u540c\u6837\u652f\u6301Map\u548cSet\u5bf9\u8c61\u904d\u5386\u3002<br \/>\n\u5f88\u591a\u4eba\u4e5f\u8bb8\u6ca1\u542c\u8bf4\u8fc7Map\u548cSet\u5bf9\u8c61\u3002\u4ed6\u4eec\u662fES6\u4e2d\u65b0\u589e\u7684\u7c7b\u578b\u3002\u4e0d\u77e5\u9053\u4e5f\u6ca1\u6709\u5173\u7cfb\uff0c\u6211\u5c06\u5728\u540e\u9762\u7b80\u5355\u8bb2\u89e3\u8fd9\u4e24\u4e2a\u65b0\u7684\u7c7b\u578b\uff0c\u5982\u679c\u4f60\u8fd8\u6709\u5174\u8da3\uff0c\u4f60\u53ef\u4ee5\u70b9\u51fb\u6211\u5b58\u653e\u7684\u8fde\u63a5\u3002<br \/>\n\u5982\u679c\u4f60\u66fe\u5728\u5176\u5b83\u8bed\u8a00\u4e2d\u4f7f\u7528\u8fc7Map\u548cSet\u5bf9\u8c61\uff0c\u4f60\u4f1a\u53d1\u73b0ES6\u4e2d\u7684\u5e76\u65e0\u592a\u5927\u51fa\u5165\u3002<br \/>\n\u5176\u5b9e\u8bb2\u7b80\u5355\u70b9\u5c31\u662fSet\u5bf9\u8c61\u53ef\u4ee5\u81ea\u52a8\u6392\u9664\u91cd\u590d\u9879\uff1a\n\t\t\t<\/p>\n<pre class=\"hljs javascript\">\r\n<\/pre>\n<pre class=\"prettyprint lang-js\">\/\/ \u57fa\u4e8e\u5355\u8bcd\u6570\u7ec4\u521b\u5efa\u4e00\u4e2aset\u5bf9\u8c61\r\nvar words = ['yanmoer','qinni','yanmoer']\r\nvar uniqueWords = new Set(words);   \/\/ \u5982\u679c\u6210\u4e3aSet\u5bf9\u8c61\uff0c\u8f93\u51fa\u7ed3\u679c\u4f1a\u53bb\u6389\u91cd\u590d\u9879\r\nconsole.log(uniqueWords); \/\/ Set {\"yanmoer\", \"qinni\"}\r\n\/\/ \u751f\u6210Set\u5bf9\u8c61\u540e\uff0c\u4f60\u53ef\u4ee5\u8f7b\u677e\u904d\u5386\u5b83\u6240\u5305\u542b\u7684\u5185\u5bb9\uff1a\r\nfor (var word of uniqueWords) {\r\n   console.log(word); \/\/ yanmoer,qinni\r\n}\r\n\r\n\r\n<\/pre>\n<p><\/p>\n<p>\n\t\t\t\tSet\u5bf9\u8c61\u8fd8\u6709\u4e00\u4e9b\u65b9\u6cd5\uff0c\u8fd9\u91cc\u4e0d\u4e00\u4e00\u5217\u4e3e\u4e86\uff0c\u8be6\u60c5\u8bf7\u89c1\u5b98\u7f51api\uff1aSet\u5bf9\u8c61<br \/>\nMap\u5bf9\u8c61\u5219\u7a0d\u6709\u4e0d\u540c\uff1a\u5185\u542b\u7684\u6570\u636e\u7531\u952e\u503c\u5bf9\u7ec4\u6210\uff0c\u6240\u4ee5\u4f60\u9700\u8981\u4f7f\u7528\u89e3\u6784\uff08destructuring\uff09\u6765\u5c06\u952e\u503c\u5bf9\u62c6\u89e3\u4e3a\u4e24\u4e2a\u72ec\u7acb\u7684\u53d8\u91cf\uff0c\u4f8b\u5b50\u8bf4\u660e\uff1a\n\t\t\t<\/p>\n<pre class=\"hljs javascript\">\r\n<\/pre>\n<pre class=\"prettyprint lang-js\">var phoneBookMap = [['name','yanmo'],['age','22']]; \/\/ Map\u5bf9\u8c61\u5c31\u662f\u8fd9\u6837\u7684\r\nfor (var [key, value] of phoneBookMap) { \/\/ [key, value]\u5c31\u662f\u89e3\u6784\r\n    console.log(key + \" : \" + value); \/\/'name' : 'yanmo','age' : '22'\r\n}\r\n\r\n<\/pre>\n<p><\/p>\n<p>\n\t\t\t\t\u5176\u5b9eMap\u5bf9\u8c61\u5c31\u662f\u7b80\u5355\u7684\u952e\/\u503c\u6620\u5c04\u3002\u5176\u4e2d\u952e\u548c\u503c\u53ef\u4ee5\u662f\u4efb\u610f\u503c(\u5bf9\u8c61\u6216\u8005\u539f\u59cb\u503c)\u3002\u5173\u4e8eMap\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u4e5f\u662f\u8be6\u60c5\u8bf7\u89c1\u5b98\u7f51api\uff1aMap\u5bf9\u8c61<br \/>\n\u89e3\u6784\u4e5f\u662fES6\u7684\u65b0\u7279\u6027\uff0c\u7b80\u5355\u8bf4\u6765\u89e3\u6784\u8d4b\u503c\u5c31\u662f\u5141\u8bb8\u4f60\u4f7f\u7528\u7c7b\u4f3c\u6570\u7ec4\u6216\u5bf9\u8c61\u5b57\u9762\u91cf\u7684\u8bed\u6cd5\u5c06\u6570\u7ec4\u548c\u5bf9\u8c61\u7684\u5c5e\u6027\u8d4b\u7ed9\u5404\u79cd\u53d8\u91cf\uff0c\u6211\u5c06\u5728\u540e\u7eed\u7684\u6587\u7ae0\u4e2d\u8fdb\u884c\u8bb2\u89e3\u3002\u770b\u6765\u6211\u5e94\u8be5\u8bb0\u5f55\u8fd9\u4e9b\u4f18\u79c0\u7684\u95ee\u9898\uff0c\u672a\u6765\u518d\u8fdb\u884c\u76f8\u5173\u65b0\u5185\u5bb9\u7684\u4e00\u4e00\u5256\u6790\u3002\n\t\t\t<\/p>\n<blockquote>\n<p>\n\t\t\t\t\t\u73b0\u5728\uff0c\u4f60\u53ea\u9700\u8bb0\u4f4f\uff1a\u672a\u6765\u7684JS\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u65b0\u578b\u7684\u96c6\u5408\u7c7b\uff0c\u751a\u81f3\u4f1a\u6709\u66f4\u591a\u7684\u7c7b\u578b\u9646\u7eed\u8bde\u751f\uff0c\u800cfor-of\u5c31\u662f\u4e3a\u904d\u5386\u6240\u6709\u8fd9\u4e9b\u96c6\u5408\u7279\u522b\u8bbe\u8ba1\u7684\u5faa\u73af\u8bed\u53e5\u3002\n\t\t\t\t<\/p>\n<\/blockquote>\n<p>\n\t\t\t\tfor-of\u5faa\u73af\u4e0d\u652f\u6301\u666e\u901a\u5bf9\u8c61\uff0c\u4f60\u5e94\u5f53\u7528\u7528for-in\u5faa\u73af\uff08\u8fd9\u4e5f\u662f\u5b83\u7684\u672c\u804c\u5de5\u4f5c\uff09\u6216\u5185\u5efa\u7684Object.keys()\u65b9\u6cd5\uff1a\n\t\t\t<\/p>\n<pre class=\"hljs javascript\">\r\n<\/pre>\n<pre class=\"prettyprint lang-js\">\/\/ \u5411\u63a7\u5236\u53f0\u8f93\u51fa\u5bf9\u8c61\u7684\u53ef\u679a\u4e3e\u5c5e\u6027\r\nvar someObject = {\r\n    classA: 'textColor',\r\n    classB: 'textSize',\r\n    isA: false \r\n}\r\nfor (var key of Object.keys(someObject)) {\r\n    console.log(key + \": \" + someObject[key]); \/\/ classA: 'textColor',classB: 'textSize',isA: false\r\n}\r\n\r\n<\/pre>\n<h2 style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">\n\t\t\t\tPromises\uff0cGenerators<br \/>\n\t\t\t<\/h2>\n<pre class=\"prettyprint lang-js\">\/\/ \u4ece\u8bed\u8a00\u5c42\u9762\u4e0a\u652f\u6301Promise\r\nlet promise = new Promise(function(resolve, reject) {\r\n  \/\/ ... some code\r\n\r\n\tif (\/* \u5f02\u6b65\u64cd\u4f5c\u6210\u529f *\/){\r\n\t\tresolve(value);\r\n\t}\r\nelse {\r\n\t\treject(error);\r\n\t}\r\n});\r\n\r\npromise.then(successFn, failFn);\r\n\r\n\r\nfunction* helloWorldGenerator() {\r\n  yield 'hello';\r\n  yield 'world';\r\n  return 'ending';\r\n}\r\n\r\nvar hw = helloWorldGenerator(); \/\/ \u6307\u5411\u5185\u90e8\u72b6\u6001\u7684\u6307\u9488\u5bf9\u8c61\r\n\r\nhw.next()  \/\/ \u8c03\u7528next\u65b9\u6cd5\uff0c\u4f7f\u5f97\u6307\u9488\u79fb\u5411\u4e0b\u4e00\u4e2a\u72b6\u6001\r\n\/\/ { value: 'hello', done: false }\r\n\r\nhw.next()\r\n\/\/ { value: 'world', done: false }\r\n\r\nhw.next()\r\n\/\/ { value: 'ending', done: true }\r\n\r\nhw.next()\r\n\/\/ { value: undefined, done: true }<\/pre>\n<h3 id=\"proxies-\u4ee3\u7406\" style=\"font-size:16px;font-family:Verdana, Arial, Helvetica, sans-serif;\">\n\t\t\t\tProxies \u4ee3\u7406<br \/>\n\t\t\t<\/h3>\n<p>\n\t\t\t\t<span style=\"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:14px;background-color:#FFFFFF;\">\u4ee3\u7406\u53ef\u4ee5\u521b\u9020\u4e00\u4e2a\u5177\u5907\u5bbf\u4e3b\u5bf9\u8c61\u5168\u90e8\u53ef\u7528\u884c\u4e3a\u7684\u5bf9\u8c61\u3002\u53ef\u7528\u4e8e\u62e6\u622a\u3001\u5bf9\u8c61\u865a\u62df\u5316\u3001\u65e5\u5fd7\/\u5206\u6790\u7b49\u3002<\/span>\n\t\t\t<\/p>\n<p>\n\t\t\t\t<span style=\"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:14px;background-color:#FFFFFF;\"><br \/>\n<\/span>\n\t\t\t<\/p>\n<p><span style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:medium;background-color:#FFFFFF;\">Proxy\u53ef\u4ee5\u7406\u89e3\u6210\uff0c\u5728\u76ee\u6807\u5bf9\u8c61\u4e4b\u524d\u67b6\u8bbe\u4e00\u5c42\u201c\u62e6\u622a\u201d\uff0c\u5916\u754c\u5bf9\u8be5\u5bf9\u8c61\u7684\u8bbf\u95ee\uff0c\u90fd\u5fc5\u987b\u5148\u901a\u8fc7\u8fd9\u5c42\u62e6\u622a\uff0c\u56e0\u6b64\u63d0\u4f9b\u4e86\u4e00\u79cd\u673a\u5236\uff0c\u53ef\u4ee5\u5bf9\u5916\u754c\u7684\u8bbf\u95ee\u8fdb\u884c\u8fc7\u6ee4\u548c\u6539\u5199<\/span><\/p><\/div>\n<\/p>\n<pre class=\"prettyprint lang-js\">var MyArray = function () {\r\n    return new Proxy(Array.apply(null, arguments), {\r\n        get: function (target, name) {\r\n            if (name in target || (+name &gt;= 0 &amp;&amp; +name &lt; 4294967295)) {\r\n                return target[name];\r\n            } else {\r\n                throw \"\u975e\u6cd5\u7d22\u5f15\";\r\n            }\r\n        },\r\n        set: function (target, name, val) {\r\n            if (name in target || (+name &gt;= 0 &amp;&amp; +name &lt; 4294967295)) {\r\n                target[name] = val;\r\n            } else {\r\n                throw \"\u975e\u6cd5\u7d22\u5f15\";\r\n            }\r\n        }\r\n    })\r\n}\r\n\r\nvar arr = MyArray(1,2,3);   \/\/\u65b0\u5efa\u4e00\u4e2a\u81ea\u5b9a\u4e49\u6570\u7ec4\r\narr;                        \/\/[1, 2, 3]\r\narr.push(4);                \/\/\u6570\u7ec4\u65b9\u6cd5\u4e5f\u80fd\u6b63\u5e38\u4f7f\u7528\r\narr;                        \/\/[1, 2, 3, 4]\r\narr[999999999999]           \/\/\u629b\u51fa\u5f02\u5e38,\"\u975e\u6cd5\u7d22\u5f15\"\r\narr[\"foo\"] = 1              \/\/\u629b\u51fa\u5f02\u5e38,\"\u975e\u6cd5\u7d22\u5f15\"<\/pre>\n<h3 id=\"math-number-string-object-apis-\u6269\u5c55\" style=\"font-size:16px;font-family:Verdana, Arial, Helvetica, sans-serif;\">\n\t\t\tMath + Number + String + Object APIs \u6269\u5c55<br \/>\n\t\t<\/h3>\n<p><\/p>\n<p style=\"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:14px;\">\n\t\t\t\u65b0\u52a0\u5165\u4e86\u8bb8\u591a\u5e93\uff0c\u5305\u62ec\u6838\u5fc3\u6570\u5b66\u5e93\uff0c\u8fdb\u884c\u6570\u7ec4\u8f6c\u6362\u7684\u534f\u52a9\u51fd\u6570\uff0c\u5b57\u7b26\u4e32 helper\uff0c\u4ee5\u53ca\u7528\u6765\u8fdb\u884c\u62f7\u8d1d\u7684Object.assign\u3002\n\t\t<\/p>\n<div>\n\t\t\t\n\t\t<\/div>\n<div class=\"sourceCode\" style=\"margin:0px;padding:0px;font-family:Verdana, Arial, Helvetica, sans-serif;font-size:14px;\">\n<pre class=\"sourceCode javascript\"><\/pre>\n<\/p><\/div>\n<pre class=\"prettyprint lang-js\">Number.EPSILON\r\nNumber.isInteger(Infinity) \/\/ false\r\nNumber.isNaN(\"NaN\") \/\/ false\r\n\r\nMath.acosh(3) \/\/ 1.762747174039086\r\nMath.hypot(3, 4) \/\/ 5\r\nMath.imul(Math.pow(2, 32) - 1, Math.pow(2, 32) - 2) \/\/ 2\r\n\r\n\"abcde\".includes(\"cd\") \/\/ true\r\n\"abc\".repeat(3) \/\/ \"abcabcabc\"\r\n\r\nArray.from(document.querySelectorAll('*')) \/\/ Returns a real Array \u8fd4\u56de\u4e00\u4e2a\u771f\u6b63\u7684Array\r\nArray.of(1, 2, 3) \/\/ Similar to new Array(...), but without special one-arg behavior \u4e0eArray(...)\u7c7b\u4f3c\uff0c\u4f46\u53ea\u6709\u4e00\u4e2a\u53c2\u6570\u65f6\uff0c\u5e76\u4e0d\u4f1a\u6709\u7279\u6b8a\u884c\u4e3a\u3002\r\n[0, 0, 0].fill(7, 1) \/\/ [0,7,7]\r\n[1, 2, 3].find(x =&gt; x == 3) \/\/ 3\r\n[1, 2, 3].findIndex(x =&gt; x == 2) \/\/ 1\r\n[1, 2, 3, 4, 5].copyWithin(3, 0) \/\/ [1, 2, 3, 1, 2]\r\n[\"a\", \"b\", \"c\"].entries() \/\/ iterator [0, \"a\"], [1,\"b\"], [2,\"c\"]\r\n[\"a\", \"b\", \"c\"].keys() \/\/ iterator 0, 1, 2\r\n[\"a\", \"b\", \"c\"].values() \/\/ iterator \"a\", \"b\", \"c\"\r\n\r\nObject.assign(Point, { origin: new Point(0,0) })<\/pre>\n<h3 id=\"tail-calls-\u5c3e\u8c03\u7528\" style=\"font-size:16px;font-family:Verdana, Arial, Helvetica, sans-serif;\">\n\t\tTail Calls \u5c3e\u8c03\u7528<br \/>\n\t<\/h3>\n<pre class=\"prettyprint lang-js\">function factorial(n, acc = 1) {\r\n    'use strict';\r\n    if (n &lt;= 1) return acc;\r\n    return factorial(n - 1, n * acc);\r\n}\r\n\r\n\/\/ Stack overflow in most implementations today,\r\n\/\/ but safe on arbitrary inputs in ES6\r\n\/\/ \u6808\u6ea2\u51fa\u5b58\u5728\u4e8e\u73b0\u5728\u7edd\u5927\u591a\u6570\u7684\u5b9e\u73b0\u4e2d\uff0c\r\n\/\/ \u4f46\u662f\u5728 ES6 \u4e2d\uff0c\u9488\u5bf9\u4efb\u610f\u7684\u8f93\u5165\u90fd\u5f88\u5b89\u5168\r\nfactorial(100000)<\/pre>\n<p><span style=\"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:14px;background-color:#FFFFFF;\">ES6 \u7684\u4e00\u90e8\u5206\u7279\u6027\u770b\u8d77\u6765\u5f88\u50cf Go<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Iterators + For..Of \u8fed\u4ee3\u5668 + For..of \u5faa\u73af 1\uff09for\u5faa\u73af\u7684\u7591\u95ee \u8d77\u521d\u6211\u4eec\u5982\u4f55\u904d&#8230;<\/p>\n","protected":false},"author":2,"featured_media":228,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[38,60],"tags":[210],"_links":{"self":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/2997"}],"collection":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/comments?post=2997"}],"version-history":[{"count":1,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/2997\/revisions"}],"predecessor-version":[{"id":2998,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/2997\/revisions\/2998"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/media\/228"}],"wp:attachment":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/media?parent=2997"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/categories?post=2997"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/tags?post=2997"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}