{"id":2990,"date":"2018-02-22T16:40:57","date_gmt":"2018-02-22T08:40:57","guid":{"rendered":"http:\/\/www.daliane.com\/?p=2990"},"modified":"2018-02-22T17:32:18","modified_gmt":"2018-02-22T09:32:18","slug":"30_fen_zhong_kuai_su_shang_shou_es6","status":"publish","type":"post","link":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/30_fen_zhong_kuai_su_shang_shou_es6\/","title":{"rendered":"30\u5206\u949f\u5feb\u901f\u4e0a\u624bES6\uff08\u4e0a\uff09"},"content":{"rendered":"<p>\n\t\u72d7\u5e74\u6625\u8282\u521a\u8fc7\uff0c\u4eca\u5929\u7b2c\u4e00\u5929\u4e0a\u73ed\u3002\u65b0\u7684\u6280\u672f\u603b\u662f\u5f88\u5feb\u7684\u5360\u5230\u4e3b\u5bfc\u5730\u4f4d\u3002\u5feb\u5230\u4f60\u89c9\u5f97\u4ed6\u4eff\u4f5b\u5c31\u662f\u6628\u5929\u63a8\u51fa\u6765\u7684\u300215\u5e74\u6765\uff0c\u4e00\u76f4\u4e3b\u52a8\u6216\u88ab\u52a8\u5730\u53bb\u5b66\u4e60\u8fd9\u4e9b\u65b0\u6280\u672f\u3002\u53ea\u4e3a\u4e86\u81ea\u5df1\u4e0d\u843d\u4f0d\u3002\u8f6c\u773c\u770b\uff0cES6\u5df2\u662f\u4e24\u5e74\u524d\u7684\u4e1c\u897f\u4e86\u3002\n<\/p>\n<p>\n\t\n<\/p>\n<h2>\n\t1.\u7bad\u5934\u51fd\u6570<br \/>\n<\/h2>\n<p>\n\t\n<\/p>\n<pre class=\"prettyprint lang-js\">[1, 2, 3, 4, 5].map(function(v){\r\n    return v + 1\r\n})\r\n\r\n\/\/ \u4f7f\u7528\u7bad\u5934\u51fd\u6570\u66f4\u6539\r\n[1, 2, 3, 4, 5].map(v =&gt; v + 1)<\/pre>\n<p>\n\t\n<\/p>\n<p>\n\t\n<\/p>\n<pre class=\"prettyprint lang-js\">function Person(){\r\n    this.name = 'Person'\r\n\r\n    this.hello = () =&gt; {\r\n        console.log(this.name)\r\n    }\r\n}\r\n\r\nvar xiaoming = new Person\r\n\r\nxiaoming.hello.bind({name: 'xiaoming'})() \/\/Person<\/pre>\n<p>\n\t\n<\/p>\n<p>\u901a\u4fd7\u5730\u8bb2\uff1a<\/p>\n<p>\n\t\u7279\u6027\u4e00\uff1a\n<\/p>\n<p>\n\t<strong>\u7bad\u5934\u524d\u9762\u662f\u4e00\u4e2a\u51fd\u6570\u7684\u53c2\u6570\uff0c\u7bad\u5934\u540e\u9762\u662f\u4e00\u4e2a\u51fd\u6570\u7684\u4e3b\u8868\u8fbe\u5f0f\u3002<\/strong>\n<\/p>\n<p>\n\t\u7279\u6027\u4e8c\uff1a\n<\/p>\n<p>\n\tthis\u88ab\u9501\u6b7b\uff0c\u4e0d\u4f1a\u56e0\u4e0a\u4e0b\u6587\u7684\u4fee\u6539\u800c\u6539\u53d8\u3002\n<\/p>\n<p>\n\t\n<\/p>\n<h2>\n\t2.<span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">Default + Rest + Spread<\/span><br \/>\n<\/h2>\n<p>\n\t&nbsp;\u8bed\u6cd5\u7cd6\n<\/p>\n<h3>\n\ta.\u8868\u8fbe\u5f0f\u505a\u9ed8\u8ba4\u503c\uff08\u53c2\u6570\uff09<br \/>\n<\/h3>\n<p>\n\t\n<\/p>\n<pre class=\"prettyprint lang-js\">function f(x, y=12) {\r\n\r\n    \/\/ y is 12 if not passed (or passed as undefined)\r\n    return x + y;\r\n}\r\n\r\nf(3) == 15<\/pre>\n<p>\u770b\u90a3\u4e2a\u53c2\u6570Y\uff0c\u5728\u4f20\u5165\u65f6\u76f4\u63a5\u7ed9\u4e86\u9ed8\u8ba4\u503c<\/p>\n<p>\n\t\n<\/p>\n<h3>\n\tb.<span style=\"font-weight:600;color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;\">Rest\uff08\u7701\u7565\u53f7\u5f15\u8fdb\u53c2\u6570\uff0c \u53ef\u4ee5\u628a\u4f20\u7684\u53c2\u6570\u76f4\u63a5\u7528\u505a\u6570\u7ec4\uff09\u63a5\u5408spread\u66f4\u597d\u7406\u89e3<\/span><br \/>\n<\/h3>\n<p>\n\t<span style=\"font-weight:600;\"> <\/span>\n<\/p>\n<pre class=\"prettyprint lang-js\">function add(...values) {\r\n   var sum = 0;\r\n\r\n   for (var val of values) {\r\n      sum += val;\r\n   }\r\n\r\n   return sum;\r\n}\r\n\r\nadd(2, 5, 3) \/\/ 10<\/pre>\n<p style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;\">\n\t\n<\/p>\n<p>\n\t\n<\/p>\n<h3>\n\t<span style=\"background-color:#FFFFFF;\">c.<\/span><span style=\"color:#4F4F4F;font-family:&quot;font-size:12px;background-color:#FFFFFF;\">spread<\/span><span style=\"color:#4F4F4F;\">&nbsp;<\/span><span style=\"color:#4F4F4F;font-family:&quot;font-size:12px;background-color:#FFFFFF;\">\u5c55\u5f00\u8fd0\u7b97\u7b26\uff08spread\uff09\u662f\u4e09\u4e2a\u70b9\uff08\u2026\uff09<\/span><br \/>\n<\/h3>\n<h3>\n\t<span style=\"color:#4F4F4F;font-family:&quot;font-size:12px;background-color:#FFFFFF;\">\u53ef\u4ee5\u5c06\u6570\u7ec4\u8f6c\u4e3a\u7528\u9017\u53f7\u5206\u9694\u7684\u53c2\u6570\u5e8f\u5217<\/span><br \/>\n<\/h3>\n<p>\n\t\n<\/p>\n<p style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;\">\n\t\u5b9e\u6218\u6848\u4f8b\uff1a\n<\/p>\n<pre class=\"prettyprint lang-js\">Math.max(...[14, 3, 77])<\/pre>\n<p>\n\t\n<\/p>\n<p style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;\">\n\t\u7b49\u4ef7\u8868\u8fbe\n<\/p>\n<p style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;\">\n\t\n<\/p>\n<pre class=\"prettyprint lang-js\">function func(x, y, z) { }\r\nvar args = [0, 1, 2];\r\n\r\n\/\/ ES5\u5199\u6cd5\r\nfunc.apply(null, args);\r\n\r\n\/\/ ES6\u5199\u6cd5\r\nfunc(...args);<\/pre>\n<p>\n\t\n<\/p>\n<h2>\n\t3.<span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">Destructuring \u89e3\u6784\u8d4b\u503c<\/span><br \/>\n<\/h2>\n<p>\n\t\u901a\u4fd7\u6765\u8bb2\u5c31\u662f\u76f8\u540c\u7684\u7ed3\u6784\u4e0b\uff0c\u65b9\u4fbf\u8d4b\u503c\n<\/p>\n<p>\n\t\n<\/p>\n<pre class=\"prettyprint lang-js\">\/\/ \u6570\u7ec4\u5339\u914d\u8d4b\u503c\r\nvar [a, , b] = [1, 2, 3];\r\n\r\n\/\/ \u5bf9\u8c61\u5339\u914d\u8d4b\u503c\r\nvar { foo, bar } = { foo: \"aaa\", bar: \"bbb\" };\r\n\r\n\/\/ \u652f\u6301\u5e26\u9ed8\u8ba4\u503c\u7684\u89e3\u6784\u8d4b\u503c\r\nvar [a = 1] = [];\r\na === 1;\r\n\r\nvar {a = 1} = {};\r\na === 1;<\/pre>\n<p><span style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:medium;background-color:#FFFFFF;\">\u4ece\u5bf9\u8c61\u4e2d\u63d0\u53d6\u76f8\u5e94\u7684\u952e\u503c\u5c24\u5176\u65b9\u4fbf<\/span> <\/p>\n<p>\n\t\n<\/p>\n<p>\n\t<span style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:medium;background-color:#FFFFFF;\"> <\/span>\n<\/p>\n<pre class=\"prettyprint lang-js\">\/\/ \u4ece\u5bf9\u8c61\u4e2d\u63d0\u53d6\u952e\u503c\r\nvar jsonData = {\r\n    id: 42,\r\n    status: \"OK\",\r\n    data: [867, 5309]\r\n}\r\n\r\n\/\/ \u628a\u952e\u540ddata\u66f4\u6539\u4e3anumber\r\nlet { id, status, data: number } = jsonData;\r\n\r\nconsole.log(id, status, number)\r\n\/\/ 42, OK, [867, 5309]\r\n\r\n\r\n\r\n<\/pre>\n<h1>\n\t<span style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:medium;background-color:#FFFFFF;\">4.<\/span><span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">Template strings <span style=\"color:#333333;font-family:Helvetica, &quot;font-size:14px;background-color:#FFFFFF;\">\u6a21\u677f\u5b57\u7b26\u4e32<\/span>\u53d6\u4ee3\u8fde\u63a5\u5b57\u7b26\u4e32<\/span><br \/>\n<\/h1>\n<p>\n\t\n<\/p>\n<p>\n\t<span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\"> <\/span>\n<\/p>\n<pre class=\"prettyprint lang-js\">function authorize(user, action) {\r\n  if (!user.hasPrivilege(action)) {\r\n    throw new Error(\r\n      `\u7528\u6237 ${user.name} \u672a\u88ab\u6388\u6743\u6267\u884c ${action} \u64cd\u4f5c\u3002`);\r\n  }\r\n}<\/pre>\n<p><span style=\"font-family:Helvetica, &quot;font-size:14px;background-color:#FFFFFF;\">ES6\u5f15\u5165\u4e86\u4e00\u79cd\u65b0\u578b\u7684\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u8bed\u6cd5\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a\u6a21\u677f\u5b57\u7b26\u4e32\uff08template strings\uff09\u3002\u9664\u4e86\u4f7f\u7528\u53cd\u6487\u53f7\u5b57\u7b26 ` \u4ee3\u66ff\u666e\u901a\u5b57\u7b26\u4e32\u7684\u5f15\u53f7 &#8216; \u6216 &#8221; \u5916\uff0c\u5b83\u4eec\u770b\u8d77\u6765\u4e0e\u666e\u901a\u5b57\u7b26\u4e32\u5e76\u65e0\u4e8c\u81f4\u3002<\/span> <\/p>\n<p>\n\t\n<\/p>\n<p><span style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:medium;background-color:#FFFFFF;\"><\/span> <\/p>\n<h1>\n\t5.<span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">Enhanced Object Literals<\/span><br \/>\n<\/h1>\n<p>\n\t<span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\"> <\/span>\n<\/p>\n<pre class=\"prettyprint lang-js\">var obj = {\r\n    handler,\r\n    toString() {\r\n        return \"d \" + super.toString();\r\n    },\r\n    [ 'prop_' + (() =&gt; 42)() ]: 42\r\n};<\/pre>\n<p><span style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:medium;background-color:#FFFFFF;\">\u5b83\u5141\u8bb8\u4e86\u5bf9\u8c61\u5b57\u9762\u91cf\u7684\u952e\u540d\u4f7f\u7528\u53d8\u91cf\u5b9a\u4e49\uff0c\u5173\u952e\u662f\u4f7f\u7528\u4e2d\u62ec\u53f7[]\u5c31\u53ef\u4ee5\u6fc0\u6d3b\u8fd9\u4e2a\u8bed\u6cd5\u7cd6\u4e86<\/span> <\/p>\n<p>\n\t\n<\/p>\n<p>\n\t\n<\/p>\n<h1>\n\t<span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">6.<\/span><span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">Let + Const<\/span><br \/>\n<\/h1>\n<p><span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\"> <\/p>\n<pre class=\"prettyprint lang-js\">function printName() { \r\n    if(true) {\r\n        var name = \"hello\";\r\n    }\r\n    console.log(name); \/\/ hello\r\n}<\/pre>\n<pre class=\"prettyprint lang-js\">function printName() { \r\n    if(true) {\r\n        let name = \"hello\";\r\n    }\r\n\r\n    console.log(name); \/\/ \u6b64\u5904\u5e94\u6709\u62a5\u9519\r\n}<\/pre>\n<p><span style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:medium;background-color:#FFFFFF;\">\u6ca1\u9519\uff0c\u4f60\u7684\u773c\u775b\u6728\u6709\u770b\u9519\uff0cES6\u6240\u63d0\u4f9b\u7684\u65b0\u6807\u8bc6\u7b26let\u8ba9\u6211\u4eec\u5728\u5b9a\u4e49\u53d8\u91cf\u7684\u65f6\u5019\uff0c\u5728\u5757\u7ea7\u4ee3\u7801\u4e2d\u5177\u6709\u4f5c\u7528\u57df\u7684\u6548\u679c\uff0c\u800c\u5728\u4f7f\u7528let\u5b9a\u4e49\u7684\u53d8\u91cf\u662f\u4e0d\u4f1a\u5e26\u6765\u53d8\u91cf\u63d0\u5347\u7684\u95ee\u9898\u3002\u8fd9\u4e2a\u5bf9\u4e8eJavascript\u6765\u8bf4\u662f\u5177\u6709\u975e\u5e38\u91cd\u5927\u7684\u610f\u4e49\uff0c\u5728\u524d\u7aef\u7684\u4e00\u4e9b\u5f00\u53d1\u51c6\u5219\u91cc\u9762\u90fd\u63d0\u53ca\uff0c\u5728\u5b9a\u4e49\u53d8\u91cf\u7684\u65f6\u5019\uff0c\u9700\u8981\u628a\u6240\u4f7f\u7528\u7684\u51fd\u6570\u3001\u53d8\u91cf\u5728\u6700\u5f00\u5934\u5148\u5b9a\u4e49\uff0c\u90fd\u662f\u4e3a\u4e86\u907f\u514d\u53d8\u91cf\u63d0\u5347\u6240\u5e26\u6765\u7684\u526f\u4f5c\u7528\u3002\u800cES6\u4ece\u8bed\u6cd5\u4e0a\u53bb\u89c4\u9650\u6211\u4eec\u7684\u4ee3\u7801\uff0c\u800c\u4e0d\u9700\u8981\u4eba\u4e3a\u7684\u7ea6\u5b9a\u3002<\/span><\/span> <\/p>\n<p>\n\t\n<\/p>\n<p>\n\t\n<\/p>\n<h1>\n\t<span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">7.<\/span><span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">Map + Set<\/span><br \/>\n<\/h1>\n<p><span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\"> <\/p>\n<p style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;\">\n\t\u597d\u5728ES6\u91cc\u9762\u7ed9\u6211\u4eec\u63d0\u4f9b\u4e86\u4e00\u4e2a\u539f\u751f\u7684\u5b57\u5178\u6570\u636e\u7ed3\u6784Map\uff0c\u5b83\u7684\u4f7f\u7528\u65b9\u6cd5\u975e\u5e38\u7b80\u5355\uff0c\u8bf7\u770b\u4ee3\u7801\uff0c\u55f7\u55f7\uff1a\n<\/p>\n<div class=\"highlight\" style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;\">\n<pre><span><\/span>\/\/ Map\r\nvar m = new Map();\r\n\r\nm.set(\u2018hello\u2019, 42);\r\n\r\nm.get(\u2018hello\u2019);  \/\/42<\/pre>\n<\/div>\n<p style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;\">\n\tMap\u987e\u540d\u601d\u4e49\u662f\u4e00\u4e2ak-v\u5b58\u50a8\u7684\u6570\u636e\u7ed3\u6784\uff0c\u7c7b\u4f3cObject\uff0c\u4f46\u662f\u5b83\u66f4\u5177\u6709\u8bed\u4e49\u6027\uff0c\u5e76\u4e14\u63d0\u4f9b\u4e86\u5185\u7f6e\u7684getter\/setter\uff0c\u8fed\u4ee3\u5668\u7b49\u65b9\u6cd5\uff1a\n<\/p>\n<div class=\"highlight\" style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;\">\n<pre><span><\/span>ajax.cache = new Map;\r\n\r\najax.getDict = function(key, fn){\r\n\r\n    let cache = this.cache.get(key);\r\n\r\n    if(cache){\r\n\treturn fn(cache)\r\n    }\r\n    else{\r\n\t\/\/ ajax code\r\n    }\r\n}<\/pre>\n<p>\n\t\t\n\t<\/p>\n<pre class=\"prettyprint lang-js\">\/\/ Set\r\nvar s = new Set();\r\n\r\ns.add(\u201chello\").add(\"goodbye\").add(\"hello\");\r\n\r\ns.size === 2;\r\n\r\ns.has(\"hello\") === true;<\/pre>\n<p>\n\t\t\n\t<\/p>\n<p>\n\t\tset &nbsp;\u76f8\u5f53\u4e8e\u4e00\u4e2a\u53ef\u4ee5\u5929\u7136\u53bb\u91cd\u590d\u7684\u6570\u7ec4\u3002\n\t<\/p>\n<p>\n\t\t\n\t<\/p>\n<\/div>\n<p><\/span> <\/p>\n<p>\n\t\n<\/p>\n<ul style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;\">\n<li>\n<p>\n\t\t\tMaps\u7c7b\u4f3cObject\uff0c\u66f4\u9002\u5408KV\u7ed3\u6784&nbsp;\n\t\t<\/p>\n<\/li>\n<li>\n<p>\n\t\t\tSets\u7c7b\u4f3cArray\uff0c\u4f46\u662f\u4e0d\u5141\u8bb8\u6709\u91cd\u590d\u503c\n\t\t<\/p>\n<\/li>\n<\/ul>\n<h1>\n\t<span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">8.<\/span><span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">Classes<\/span><br \/>\n<\/h1>\n<p><span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\"> <\/p>\n<pre class=\"prettyprint lang-js\">\/\/ \u52a8\u7269Sample\u4e07\u5e74\u6897DEMO\r\n\/\/ \u4ee5\u4e0b\u662f\u7528\u4f20\u7edf\u5f97\u4e0d\u80fd\u518d\u4f20\u7edf\u7684\u65b9\u5f0f\u6765\u5c55\u793a\u5982\u4f55\u521b\u5efa\u7c7b\uff0c\u5728\u539f\u578b\u4e0a\u5b9a\u4e49\u65b9\u6cd5\r\nfunction Animal (word){\r\n\tthis.word = word;\r\n}\r\n\r\nAnimal.prototype.speak = function(){\r\n\tconsole.log(this.word)\r\n}\r\n\r\nvar cat = new Animal('\u55b5');\r\n\r\ncat.speak()<\/pre>\n<p><span style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:medium;background-color:#FFFFFF;\">ES6 \u4e2d Class \u8bed\u6cd5\u7cd6\u7684\u505a\u6cd5\uff1a<\/span><\/span> <\/p>\n<p>\n\t<span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\"> <\/span>\n<\/p>\n<pre class=\"prettyprint lang-js\">class Animal{\r\n\r\n\tconstructor(word) {\r\n\t\tthis.word = word;\r\n\t}\r\n\r\n\tspeak() {\r\n\t\tconsole.log(this.word);\r\n\t}\r\n}\r\n\r\nvar cat = new Animal('\u55b5');\r\n\r\ncat.speak() <\/pre>\n<p>\u7701\u4e86\u597d\u51e0\u884c\u4ee3\u7801<\/p>\n<p>\n\t\n<\/p>\n<p>\n\t\n<\/p>\n<h1>\n\t<span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">9.<\/span><span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\">Subclassable Built-ins<\/span><br \/>\n<\/h1>\n<p><span style=\"font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:24px;font-weight:400;color:#333333;\"><\/span><span style=\"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:16px;\">\u53ef\u5b50\u7c7b\u5316\u7684\u5185\u5efa\u5bf9\u8c61<\/span> <\/p>\n<p>\n\t\n<\/p>\n<p>\n\t<span><span style=\"color:#333333;font-family:-apple-system, BlinkMacSystemFont, &quot;font-size:medium;background-color:#FFFFFF;\">\u201cES6\u53ef\u4ee5\u81ea\u5b9a\u4e49\u539f\u751f\u6570\u636e\u7ed3\u6784\uff08\u6bd4\u5982Array\u3001String\u7b49\uff09\u7684\u5b50\u7c7b\uff0c\u800cES5\u5374\u65e0\u6cd5\u505a\u5230\u3002\u201d<\/span><\/span>\n<\/p>\n<p>\n\t<span> <\/span>\n<\/p>\n<pre class=\"prettyprint lang-js\">\/\/ Pseudo-code of Array\r\n\/\/ Array\u4f2a\u4ee3\u7801\r\nclass Array {\r\n    constructor(...args) { \/* ... *\/ }\r\n    static [Symbol.create]() {\r\n        \/\/ Install special [[DefineOwnProperty]]\r\n        \/\/ to magically update 'length'\r\n    }\r\n}\r\n\r\n\/\/ User code of Array subclass\r\n\/\/ Array\u5b50\u7c7b\u7684\u7528\u6237\u4ee3\u7801\r\nclass MyArray extends Array {\r\n    constructor(...args) { super(...args); }\r\n}\r\n\r\n\/\/ Two-phase 'new':\r\n\/\/ 1) Call @@create to allocate object\r\n\/\/ 2) Invoke constructor on new instance\r\n\r\n\/\/ \u4e24\u9636\u6bb5\u7684'new':\r\n\/\/ 1) \u8c03\u7528@@create\u6765\u4e3a\u5bf9\u8c61\u5206\u914d\u7a7a\u95f4\r\n\/\/ 2) \u5728\u65b0\u5b9e\u4f8b\u4e0a\u8c03\u7528\u6784\u9020\u51fd\u6570\r\nvar arr = new MyArray();\r\narr[1] = 12;\r\narr.length == 2<\/pre>\n<h1>\n\t<span>10.<\/span><span style=\"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:16px;\">Modules \u6a21\u5757<\/span><br \/>\n<\/h1>\n<p>\n\t\n<\/p>\n<p>\n\t<span style=\"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:16px;\"><span style=\"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:14px;background-color:#FFFFFF;\">ES6 \u5728\u8bed\u8a00\u5c42\u9762\u4e0a\u652f\u6301\u4f7f\u7528\u6a21\u5757\u6765\u8fdb\u884c\u7ec4\u4ef6\u5b9a\u4e49\uff0c\u5c06\u6d41\u884c\u7684JavaScript\u6a21\u5757\u52a0\u8f7d\u5668\uff08AMD\u3001CommonJS\uff09\u4e2d\u7684\u6a21\u5f0f\u56fa\u5316\u5230\u4e86\u8bed\u8a00\u4e2d\u3002\u8fd0\u884c\u65f6\u884c\u4e3a\u7531\u5bbf\u4e3b\u5b9a\u4e49\u7684\u9ed8\u8ba4\u52a0\u8f7d\u5668\u5b9a\u4e49\uff0c\u9690\u5f0f\u5f02\u6b65\u6a21\u578b &#8211; \u76f4\u5230\uff08\u5168\u90e8\uff09\u8bf7\u6c42\u7684\u6a21\u5757\u5747\u53ef\u7528\u4e14\u7ecf\u5904\u7406\u540e\uff0c\u624d\u4f1a\u6267\u884c\uff08\u5f53\u524d\u6a21\u5757\u5185\u7684\uff09\u4ee3\u7801\u3002<\/span><\/span>\n<\/p>\n<p>\n\t<span style=\"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:16px;\"> <\/span>\n<\/p>\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<pre class=\"prettyprint lang-js\">\/\/ lib\/math.js\r\nexport function sum(x, y) {\r\n  return x + y;\r\n}\r\nexport var pi = 3.141593;\r\n\/\/ app.js\r\nimport * as math from \"lib\/math\";\r\nalert(\"2\u03c0 = \" + math.sum(math.pi, math.pi));\r\n\/\/ otherApp.js\r\nimport {sum, pi} from \"lib\/math\";\r\nalert(\"2\u03c0 = \" + sum(pi, pi));\r\n\r\n\/\/ lib\/mathplusplus.js\r\nexport * from \"lib\/math\";\r\nexport var e = 2.71828182846;\r\nexport default function(x) {\r\n    return Math.log(x);\r\n}\r\n\/\/ app.js\r\nimport ln, {pi, e} from \"lib\/mathplusplus\";\r\nalert(\"2\u03c0 = \" + ln(e)*pi*2);<\/pre>\n<p>\n<\/div>\n<p>\n\t<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u72d7\u5e74\u6625\u8282\u521a\u8fc7\uff0c\u4eca\u5929\u7b2c\u4e00\u5929\u4e0a\u73ed\u3002\u65b0\u7684\u6280\u672f\u603b\u662f\u5f88\u5feb\u7684\u5360\u5230\u4e3b\u5bfc\u5730\u4f4d\u3002\u5feb\u5230\u4f60\u89c9\u5f97\u4ed6\u4eff\u4f5b\u5c31\u662f\u6628\u5929\u63a8\u51fa\u6765\u7684\u300215\u5e74\u6765\uff0c\u4e00\u76f4&#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":[199],"_links":{"self":[{"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/2990"}],"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=2990"}],"version-history":[{"count":6,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/2990\/revisions"}],"predecessor-version":[{"id":2996,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/posts\/2990\/revisions\/2996"}],"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=2990"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/categories?post=2990"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/wp-json\/wp\/v2\/tags?post=2990"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}