{"id":16486,"date":"2024-12-04T21:50:15","date_gmt":"2024-12-04T18:20:15","guid":{"rendered":"https:\/\/www.itpiran.net\/blog\/?p=16486"},"modified":"2024-12-04T21:50:15","modified_gmt":"2024-12-04T18:20:15","slug":"es5-vs-es6-in-javascript-14-big-changes","status":"publish","type":"post","link":"https:\/\/www.itpiran.net\/blog\/zh\/tutorials\/es5-vs-es6-in-javascript-14-big-changes\/","title":{"rendered":"JavaScript \u4e2d ES5 \u548c ES6 \u4e4b\u95f4\u7684 14 \u4e2a\u91cd\u5927\u53d8\u5316"},"content":{"rendered":"<h2 id=\"%d9%85%d9%82%d8%af%d9%85%d9%87\">\u4ecb\u7ecd<\/h2>\n<p>ES5 \u548c ES6 \u6307\u7684\u662f ECMAScript \u6807\u51c6\u7684\u4e0d\u540c\u7248\u672c\uff0cECMAScript \u662f\u4e00\u79cd\u811a\u672c\u8bed\u8a00\u89c4\u8303\uff0c\u662f\u5305\u62ec JavaScript \u5728\u5185\u7684\u591a\u79cd\u8bed\u8a00\u7684\u57fa\u7840\u3002\u4ece ES5 \u5230 ES6\uff08\u4e5f\u79f0\u4e3a ECMAScript 2015\uff09\u7684\u6f14\u8fdb\u5e26\u6765\u4e86\u8bb8\u591a\u53d8\u5316\u548c\u6539\u8fdb\u3002\u4ee5\u4e0b\u662f\u4e24\u8005\u7684\u6bd4\u8f83\uff1a<\/p>\n<h2 id=\"let-1-%d9%88-const-%d8%aa%d8%b9%d8%b1%db%8c%d9%81-%d9%85%d8%aa%d8%ba%db%8c%d8%b1%d9%87%d8%a7\">let .1 \u548c const\uff08\u58f0\u660e\u53d8\u91cf\uff09<\/h2>\n<p><strong>ES5\uff1a<\/strong> \u5b9a\u4e49\u53d8\u91cf\u7684\u4e3b\u8981\u65b9\u6cd5\u662f\u4f7f\u7528 <code inline=\"\">\u53d8\u91cf<\/code> \u786e\u5b9e\u5982\u6b64\u3002.<br \/>\n<strong>ES6\uff1a<\/strong> \u4ecb\u7ecd <code inline=\"\">\u8ba9<\/code> \u5b9a\u4e49\u57fa\u4e8e\u5757\u7684\u53d8\u91cf\u548c <code inline=\"\">\u5e38\u91cf<\/code> \u5b9a\u4e49\u57fa\u4e8e\u5757\u7684\u5e38\u91cf\u53d8\u91cf\u3002.<\/p>\n<h2 id=\"2-%d8%a7%d9%84%da%af%d9%88%d9%87%d8%a7%db%8c-%d8%b1%d8%b4%d8%aa%d9%87%d8%a7%db%8c-template-literals\">2. \u6a21\u677f\u6587\u5b57<\/h2>\n<p><strong>ES5\uff1a<\/strong> \u4f7f\u7528\u5b57\u7b26\u4e32 <code inline=\"\">+<\/code> \u4ed6\u4eec\u4e4b\u95f4\u6709\u8054\u7cfb\u3002.<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>var name = \"John\";\r\nvar greeting = \"Hello, \" + name + \"!\";<\/code><\/pre>\n<\/div>\n<p><strong>ES6\uff1a<\/strong> \u5f15\u5165\u4e86\u5b57\u7b26\u4e32\u6a21\u5f0f\u3002.<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code> let name = \"John\";\r\nlet greeting = `Hello, ${name}!`;<\/code><\/pre>\n<\/div>\n<h2 id=\"arrow-functions-3\">\u7bad\u5934\u51fd\u6570.3<\/h2>\n<p><strong>ES5<\/strong>:<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code> function(x) {\r\nreturn x * x;\r\n}<\/code><\/pre>\n<\/div>\n<p><strong>ES6\uff1a<\/strong> \u5f15\u5165\u4e86\u7bad\u5934\u51fd\u6570\uff0c\u4e3a\u7f16\u5199\u51fd\u6570\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u7b80\u6d01\u7684\u8868\u793a\u65b9\u6cd5\u3002.<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code> x =&gt; x * x;\r\n<\/code><\/pre>\n<\/div>\n<h2 id=\"4-%da%a9%d9%84%d8%a7%d8%b3%d9%87%d8%a7-classes\">4. \u8bfe\u7a0b<\/h2>\n<p><strong>ES5\uff1a<\/strong> \u539f\u578b\u7ee7\u627f\u7528\u4e8e\u6a21\u62df\u7c7b\u7684\u884c\u4e3a\u3002.<br \/>\n<strong>ES6\uff1a<\/strong> \u5173\u952e\u8bcd <code inline=\"\">\u73ed\u7ea7<\/code> \u5b83\u662f\u4e3a\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u800c\u5f15\u5165\u7684\u3002.<\/p>\n<h2 id=\"5-%d8%a8%d9%87%d8%a8%d9%88%d8%af-%d8%af%d8%b1-%d9%86%da%af%d8%a7%d8%b1%d8%b4-%d8%a7%d8%b4%db%8c%d8%a7%d8%a1-enhanced-object-literals\">5. \u589e\u5f3a\u578b\u5bf9\u8c61\u5b57\u9762\u91cf<\/h2>\n<p><strong>ES5\uff1a<\/strong> \u5bf9\u8c61\u7531\u952e\u503c\u5bf9\u5b9a\u4e49\u3002.<br \/>\n<strong>ES6\uff1a<\/strong> \u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u7b80\u6d01\u7684\u5bf9\u8c61\u5b9a\u4e49\u7b26\u53f7\u3002.<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code> let name = \"John\";\r\nlet obj = {name}; \/\/ Equivalent to {name: name}<\/code><\/pre>\n<\/div>\n<h2 id=\"6-%d8%aa%d8%ac%d8%b2%db%8c%d9%87%d8%b3%d8%a7%d8%b2%db%8c-destructuring\">6. \u89e3\u6784<\/h2>\n<p><strong>ES5\uff1a<\/strong> \u6ca1\u6709\u76f4\u63a5\u7684\u65b9\u6cd5\u3002.<br \/>\n<strong>ES6\uff1a<\/strong> \u73b0\u5728\u53ef\u4ee5\u4ee5\u66f4\u7b80\u6d01\u7684\u65b9\u5f0f\u4ece\u5bf9\u8c61\u6216\u6570\u7ec4\u4e2d\u63d0\u53d6\u591a\u4e2a\u5c5e\u6027\u3002.<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>let person = { firstName: \"John\", lastName: \"Doe\" };\r\nlet { firstName, lastName } = person;<\/code><\/pre>\n<\/div>\n<h2 id=\"7-%d9%85%d9%82%d8%a7%d8%af%db%8c%d8%b1-%d9%be%db%8c%d8%b4%d9%81%d8%b1%d8%b6%d8%8c-rest-%d9%88-spread\">7. \u9ed8\u8ba4\u503c\u3001\u5269\u4f59\u503c\u548c\u6269\u5c55\u503c<\/h2>\n<p><strong>ES5<\/strong><strong>:<\/strong> \u9ed8\u8ba4\u503c\u3001\u5269\u4f59\u503c\u6216\u4ef7\u5dee\u503c\u7684\u7ba1\u7406\u662f\u624b\u52a8\u5b8c\u6210\u7684\u3002.<br \/>\n<strong>ES6\uff1a<\/strong> \u51fd\u6570\u53c2\u6570\u7684\u9ed8\u8ba4\u503c\uff0c\u53c2\u6570 <code inline=\"\">...\u4f11\u606f<\/code> \u6536\u96c6\u53c2\u6570\u548c\u8fd0\u7b97\u7b26 <code inline=\"\">...\u4f20\u64ad<\/code> \u5f15\u5165\u6b64\u51fd\u6570\u662f\u4e3a\u4e86\u6269\u5c55\u6570\u7ec4\u6216\u5bf9\u8c61\u3002.<\/p>\n<h2 id=\"8-%d9%85%d8%a7%da%98%d9%88%d9%84%d9%87%d8%a7-modules\">8. \u6a21\u5757<\/h2>\n<p><strong>ES5\uff1a<\/strong> \u5f53\u65f6\u6ca1\u6709\u539f\u751f\u6a21\u5757\u7cfb\u7edf\u3002\u5f00\u53d1\u8005\u4f7f\u7528\u50cf CommonJS \u6216 AMD \u8fd9\u6837\u7684\u7b2c\u4e09\u65b9\u89e3\u51b3\u65b9\u6848\u3002.<br \/>\n<strong>ES6\uff1a<\/strong> \u4f7f\u7528\u539f\u751f\u6a21\u5757\u7cfb\u7edf\u7684 <code inline=\"\">\u8fdb\u53e3<\/code> \u548c <code inline=\"\">\u51fa\u53e3<\/code> \u5df2\u63a8\u51fa\u3002.<\/p>\n<h2 id=\"9-%d9%88%d8%b9%d8%af%d9%87%d9%87%d8%a7-promises\">9. \u627f\u8bfa<\/h2>\n<p><strong>ES5\uff1a<\/strong> \u56de\u8c03\u51fd\u6570\u7528\u4e8e\u5f02\u6b65\u64cd\u4f5c\u3002.<br \/>\n<strong>ES6\uff1a<\/strong> \u5f15\u5165 Promise \u7684\u76ee\u7684\u662f\u4ee5\u66f4\u7ed3\u6784\u5316\u7684\u65b9\u5f0f\u7ba1\u7406\u5f02\u6b65\u64cd\u4f5c\u3002.<\/p>\n<h2 id=\"10-%d8%ad%d9%84%d9%82%d9%87-for-of\">10. for-of \u5faa\u73af<\/h2>\n<p><strong>ES5\uff1a<\/strong> \u8981\u904d\u5386\u6570\u7ec4\uff0c\u8bf7\u4f7f\u7528\u5faa\u73af\u3002 <code inline=\"\">\u4e3a\u4e86<\/code> \u6216\u8005 <code inline=\"\">forEach<\/code> \u5b83\u88ab\u7528\u8fc7\u4e86\u3002.<br \/>\n<strong>ES6\uff1a<\/strong> \u6212\u6307 <code inline=\"\">\u7684<\/code> \u5b83\u6700\u521d\u662f\u4e3a\u904d\u5386\u53ef\u8fed\u4ee3\u5bf9\u8c61\u800c\u5f15\u5165\u7684\u3002.<\/p>\n<h2 id=\"set%d8%8c-map%d8%8c-weakset%d8%8c-weakmap-11\">Set\u3001Map\u3001WeakSet\u3001WeakMap 11<\/h2>\n<p><strong>ES5\uff1a<\/strong> \u6ca1\u6709\u76f4\u63a5\u5bf9\u5e94\u7684\u4e8b\u7269\u3002.<br \/>\n<strong>ES6\uff1a<\/strong> \u5f15\u5165\u8fd9\u7c7b\u96c6\u5408\u662f\u4e3a\u4e86\u8fdb\u884c\u6570\u636e\u7ba1\u7406\u3002.<\/p>\n<h2 id=\"12-%d9%86%d9%88%d8%b9-symbol\">12. \u7b26\u53f7\u7c7b\u578b<\/h2>\n<p><strong>ES5\uff1a<\/strong> \u6839\u672c\u6ca1\u6709\u8fd9\u79cd\u4e8b\u3002.<br \/>\n<strong>ES6\uff1a<\/strong> \u7c7b\u578b <code inline=\"\">\u8c61\u5f81<\/code> \u5f15\u5165\u6b64\u529f\u80fd\u662f\u4e3a\u4e86\u521b\u5efa\u552f\u4e00\u6807\u8bc6\u7b26\u3002.<\/p>\n<h2 id=\"13-%d8%b1%d9%88%d8%b4%d9%87%d8%a7%db%8c-%d8%a2%d8%b1%d8%a7%db%8c%d9%87-%d9%88-%d8%b4%db%8c%d8%a1\">13. \u6570\u7ec4\u548c\u5bf9\u8c61\u65b9\u6cd5<\/h2>\n<p><strong>ES5\uff1a<\/strong> \u65b9\u6cd5\u6709\u9650\u3002.<br \/>\n<strong>ES6\uff1a<\/strong> \u4f8b\u5982\u65b0\u65b9\u6cd5 <code inline=\"\">\u6570\u7ec4.from<\/code>\uff0c <code inline=\"\">\u6570\u7ec4.of<\/code>\uff0c <code inline=\"\">\u5bf9\u8c61.\u8d4b\u503c<\/code> \u6b64\u5916\uff0c\u8fd8\u6709\u8bb8\u591a\u5176\u4ed6\u89d2\u8272\u88ab\u4ecb\u7ecd\u51fa\u6765\u3002.<\/p>\n<h2 id=\"14-%d9%85%d8%af%db%8c%d8%b1%db%8c%d8%aa-%d9%be%d8%a7%d8%b1%d8%a7%d9%85%d8%aa%d8%b1%d9%87%d8%a7\">14. \u53c2\u6570\u7ba1\u7406<\/h2>\n<p><strong>ES5\uff1a<\/strong> \u4f7f\u7528\u5bf9\u8c61\u7684\u53c2\u6570 <code inline=\"\">\u8bba\u70b9<\/code> \u5df2\u6388\u4e88\u8bbf\u95ee\u6743\u9650\u3002.<br \/>\n<strong>ES6\uff1a<\/strong> \u76f4\u63a5\u652f\u6301\u4f7f\u7528\u53c2\u6570\u7ba1\u7406 <code inline=\"\">\u4f11\u606f<\/code>\uff0c <code inline=\"\">\u9ed8\u8ba4<\/code> \u548c <code inline=\"\">\u4f20\u64ad<\/code>.<\/p>\n<h2 id=\"%d9%86%d8%aa%db%8c%d8%ac%d9%87\">\u7ed3\u679c<\/h2>\n<p>\u8fd9\u662f\u4e00\u4e2a\u9ad8\u5c42\u6b21\u7684\u6bd4\u8f83\u3002\u4ece ES5 \u5230 ES6 \u7684\u8fc7\u6e21\u5e26\u6765\u4e86\u8bb8\u591a\u53d8\u5316\u548c\u6539\u8fdb\uff0c\u6781\u5927\u5730\u4e30\u5bcc\u4e86 JavaScript \u8bed\u8a00\u7684\u529f\u80fd\u3002\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\uff0c\u540e\u7eed\u7248\u672c\uff08\u4f8b\u5982 ES7\/ES2016 \u53ca\u66f4\u9ad8\u7248\u672c\uff09\u53c8\u4e3a\u8be5\u8bed\u8a00\u6dfb\u52a0\u4e86\u66f4\u591a\u7279\u6027\u3002.<\/p>","protected":false},"excerpt":{"rendered":"\u7b80\u4ecb\uff1aES5 \u548c ES6 \u6307\u7684\u662f ECMAScript \u6807\u51c6\u7684\u4e0d\u540c\u7248\u672c\uff0cECMAScript \u662f\u4e00\u79cd\u811a\u672c\u8bed\u8a00\u89c4\u8303\u2026\u2026","protected":false},"author":1,"featured_media":16489,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"\u064dEs5 \u062f\u0631 \u0645\u0642\u0627\u0628\u0644 Es6","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_opengraph-image":"","_yoast_wpseo_twitter-description":"","_yoast_wpseo_twitter-image":"","_yoast_wpseo_focuskeywords":"[]","_yoast_wpseo_primary_category":"193","footnotes":""},"categories":[193,363],"tags":[384],"class_list":{"0":"post-16486","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-tutorials","8":"category-programming","9":"tag-java-script"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>14 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