{"id":2607,"date":"2026-01-21T17:51:13","date_gmt":"2026-01-21T09:51:13","guid":{"rendered":"https:\/\/womeifei.cn\/?p=2607"},"modified":"2026-01-23T17:04:49","modified_gmt":"2026-01-23T09:04:49","slug":"treeshaking%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/womeifei.cn\/index.php\/2026\/01\/21\/treeshaking%e5%8e%9f%e7%90%86\/","title":{"rendered":"treeShaking\u539f\u7406"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">1.\u6838\u5fc3\u524d\u63d0 : ES6 Module <\/h2>\n\n\n\n<p>Tree Shaking \u751f\u6548\u7684\u6839\u672c\u524d\u63d0\u662f\u4ee3\u7801\u5fc5\u987b\u4f7f\u7528 <strong>ES6 \u6a21\u5757\u8bed\u6cd5\uff08<code>import<\/code> \/ <code>export<\/code>\uff09<\/strong>\uff0c\u800c\u4e0d\u662f CommonJS\uff08<code>require<\/code> \/ <code>module.exports<\/code>\uff09<\/p>\n\n\n\n<p><strong>CommonJS \u662f\u52a8\u6001\u7684\uff1a<\/strong> \u6a21\u5757\u7684\u5bfc\u5165\u548c\u5bfc\u51fa\u53ef\u4ee5\u5728\u4ee3\u7801\u8fd0\u884c\u65f6\u53d1\u751f\u53d8\u5316\uff08\u4f8b\u5982\u653e\u5728 <code>if<\/code> \u8bed\u53e5\u4e2d\uff09\u3002\u6784\u5efa\u5de5\u5177\u5728\u7f16\u8bd1\u65f6\u65e0\u6cd5\u786e\u5b9a\u5230\u5e95\u5f15\u7528\u4e86\u4ec0\u4e48\u3002<\/p>\n\n\n\n<p><strong>ES6 Module \u662f\u9759\u6001\u7684\uff1a<\/strong> <code>import<\/code> \u548c <code>export<\/code> \u5fc5\u987b\u5728\u9876\u5c42\uff0c\u4e0d\u80fd\u5728\u6761\u4ef6\u8bed\u53e5\u4e2d\u3002\u8fd9\u610f\u5473\u7740\u6784\u5efa\u5de5\u5177\u53ef\u4ee5\u901a\u8fc7<strong>\u9759\u6001\u5206\u6790<\/strong>\uff08\u5373\u4e0d\u8fd0\u884c\u4ee3\u7801\uff0c\u53ea\u5206\u6790\u4ee3\u7801\u7ed3\u6784\uff09\u5c31\u80fd\u786e\u5b9a\u6a21\u5757\u4e4b\u95f4\u7684\u4f9d\u8d56\u5173\u7cfb\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.\u5de5\u4f5c\u6d41\u7a0b(\u4e09\u6b65\u8d70)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e00\u6b65\uff1a\u9759\u6001\u5206\u6790 (AST \u89e3\u6790)<\/h3>\n\n\n\n<p>\u6784\u5efa\u5de5\u5177\uff08\u5982 Webpack\uff09\u5728\u6784\u5efa\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u628a\u6e90\u7801\u89e3\u6790\u6210 <strong><a href=\"https:\/\/womeifei.cn\/index.php\/2026\/01\/21\/astabstract-syntax-tree\/\" target=\"_blank\">AST\uff08Abstract Syntax Tree\uff09<\/a><\/strong>\u3002\u901a\u8fc7\u5206\u6790 AST\uff0c\u5b83\u80fd\u6e05\u695a\u5730\u77e5\u9053\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u54ea\u4e2a\u6587\u4ef6\u5bfc\u51fa\u4e86\uff08export\uff09\u54ea\u4e9b\u53d8\u91cf\/\u51fd\u6570\u3002<\/li>\n\n\n\n<li>\u54ea\u4e2a\u6587\u4ef6\u5bfc\u5165\u4e86\uff08import\uff09\u54ea\u4e9b\u53d8\u91cf\/\u51fd\u6570\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e8c\u6b65\uff1a\u6807\u8bb0 (Marking)<\/h3>\n\n\n\n<p>\u6784\u5efa\u5de5\u5177\u4f1a\u4ece\u5165\u53e3\u6587\u4ef6\uff08Entry\uff09\u5f00\u59cb\u904d\u5386\uff0c\u6807\u8bb0\u6240\u6709<strong>\u88ab\u4f7f\u7528<\/strong>\u7684\u6a21\u5757\u5bfc\u51fa\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u4e00\u4e2a\u6a21\u5757\u5bfc\u51fa\u4e86\u51fd\u6570 A \u548c\u51fd\u6570 B\uff0c\u4f46\u5728\u5176\u4ed6\u6587\u4ef6\u4e2d\u53ea <code>import { A }<\/code>\uff0c\u90a3\u4e48\u51fd\u6570 A \u88ab\u6807\u8bb0\u4e3a\u201c\u4f7f\u7528\u4e2d\u201d\u3002<\/li>\n\n\n\n<li>\u51fd\u6570 B \u867d\u7136\u88ab\u5bfc\u51fa\u4e86\uff0c\u4f46\u6ca1\u6709\u88ab\u5f15\u7528\uff0c\u56e0\u6b64\u4e0d\u4f1a\u88ab\u6807\u8bb0\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e09\u6b65\uff1a\u6d88\u9664 (Elimination)<\/h3>\n\n\n\n<p>\u8fd9\u4e00\u6b65\u901a\u5e38\u7531\u4ee3\u7801\u538b\u7f29\u5de5\u5177\uff08Minifier\uff0c\u5982 <strong>Terser<\/strong> \u6216 <strong>UglifyJS<\/strong>\uff09\u5b8c\u6210\u3002 \u5f53\u538b\u7f29\u5de5\u5177\u5904\u7406\u4ee3\u7801\u65f6\uff0c\u5b83\u4f1a\u8bc6\u522b\u51fa\u90a3\u4e9b\u88ab\u6807\u8bb0\u4e3a\u201c\u672a\u5f15\u7528\u201d\u7684\u4ee3\u7801\uff08Dead Code\uff09\uff0c\u76f4\u63a5\u5c06\u5176\u4ece\u6700\u7ec8\u7684 Bundle \u4e2d\u5254\u9664\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3.\u4ee3\u7801\u793a\u4f8b<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/utils.js\nexport function add(a, b) {\n  return a + b;\n}\n\nexport function minus(a, b) { \/\/ \u8fd9\u4e2a\u51fd\u6570\u6ca1\u6709\u88ab\u7528\u5230\n  return a - b;\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/main.js\nimport { add } from '.\/utils';\n\nconsole.log(add(1, 2));<\/code><\/pre>\n\n\n\n<p><strong>Tree Shaking \u540e\u7684\u7ed3\u679c\uff1a<\/strong> <code>minus<\/code> \u51fd\u6570\u4f1a\u88ab\u5b8c\u5168\u4e22\u5f03\uff0c\u6700\u7ec8\u6253\u5305\u7ed3\u679c\u91cc\u53ea\u6709 <code>add<\/code> \u51fd\u6570\u548c <code>console.log<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4.\u6700\u5927\u969c\u788d : \u526f\u4f5c\u7528(Side Effects)<\/h2>\n\n\n\n<p>\u8fd9\u662f Tree Shaking \u4e2d\u6700\u5bb9\u6613\u8e29\u5751\u7684\u5730\u65b9\u3002<\/p>\n\n\n\n<p><strong>\u4ec0\u4e48\u662f\u526f\u4f5c\u7528\uff1f<\/strong> \u526f\u4f5c\u7528\u662f\u6307\u4e00\u4e2a\u6a21\u5757\u9664\u4e86\u5bfc\u51fa\u6210\u5458\u4e4b\u5916\uff0c\u8fd8\u505a\u4e86\u5176\u4ed6\u4e8b\u60c5\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4fee\u6539\u5168\u5c40\u53d8\u91cf\uff08\u5982 <code>window.polyfill = ...<\/code>\uff09\u3002<\/li>\n\n\n\n<li>\u5728\u539f\u578b\u94fe\u4e0a\u6dfb\u52a0\u65b9\u6cd5\uff08\u5982 <code>Array.prototype.includes = ...<\/code>\uff09\u3002<\/li>\n\n\n\n<li>\u5f15\u5165 CSS \u6587\u4ef6\uff08<code>import '.\/style.css'<\/code>\uff09\u3002<\/li>\n\n\n\n<li>\u6267\u884c <code>console.log<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u4e3a\u4ec0\u4e48\u526f\u4f5c\u7528\u4f1a\u963b\u788d Tree Shaking\uff1f<\/strong> \u5982\u679c\u6784\u5efa\u5de5\u5177\u53d1\u73b0\u4e00\u4e2a\u6587\u4ef6\u6709\u201c\u526f\u4f5c\u7528\u201d\uff0c\u5373\u4f7f\u4f60\u6ca1\u6709\u5728\u4ee3\u7801\u91cc\u663e\u5f0f\u5f15\u7528\u5b83\u7684\u5bfc\u51fa\u5185\u5bb9\uff0c\u6784\u5efa\u5de5\u5177\u4e5f\u4e0d\u6562\u8f7b\u6613\u5220\u9664\u5b83\uff0c\u56e0\u4e3a\u5b83\u62c5\u5fc3\u5220\u9664\u540e\u4f1a\u7834\u574f\u7a0b\u5e8f\u7684\u903b\u8f91\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5.\u603b\u7ed3<\/h2>\n\n\n\n<p><strong>\u4f9d\u8d56 ESM\uff1a<\/strong> \u5229\u7528 ES6 \u6a21\u5757\u7684\u9759\u6001\u7279\u6027\u3002<\/p>\n\n\n\n<p><strong>\u6784\u5efa\u4f9d\u8d56\u56fe\uff1a<\/strong> \u904d\u5386\u4ee3\u7801\uff0c\u5206\u6790 import\/export\u3002<\/p>\n\n\n\n<p><strong>\u53ef\u8fbe\u6027\u5206\u6790\uff1a<\/strong> \u5224\u65ad\u54ea\u4e9b\u5bfc\u51fa\u7684\u4ee3\u7801\u88ab\u4f7f\u7528\u4e86\uff0c\u54ea\u4e9b\u662f\u201c\u6b7b\u4ee3\u7801\u201d\u3002<\/p>\n\n\n\n<p><strong>\u538b\u7f29\u5220\u9664\uff1a<\/strong> \u7ed3\u5408 Terser \u7b49\u538b\u7f29\u5de5\u5177\uff0c\u5c06\u672a\u4f7f\u7528\u7684\u4ee3\u7801\u7269\u7406\u79fb\u9664\u3002<\/p>\n\n\n\n<p><strong>\u526f\u4f5c\u7528\u5904\u7406\uff1a<\/strong> \u901a\u8fc7 <code>sideEffects<\/code> \u6807\u8bb0\uff0c\u624b\u52a8\u544a\u77e5\u5de5\u5177\u54ea\u4e9b\u6587\u4ef6\u53ef\u4ee5\u5b89\u5168\u8df3\u8fc7\u526f\u4f5c\u7528\u68c0\u67e5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1.\u6838\u5fc3\u524d\u63d0 : ES6 Module Tree Shaking \u751f\u6548\u7684\u6839\u672c\u524d\u63d0\u662f\u4ee3\u7801\u5fc5\u987b\u4f7f\u7528 ES6 \u6a21\u5757\u8bed [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[51,1],"tags":[],"class_list":["post-2607","post","type-post","status-publish","format-standard","hentry","category-vite","category-1"],"_links":{"self":[{"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/posts\/2607","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/comments?post=2607"}],"version-history":[{"count":3,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/posts\/2607\/revisions"}],"predecessor-version":[{"id":2648,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/posts\/2607\/revisions\/2648"}],"wp:attachment":[{"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/media?parent=2607"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/categories?post=2607"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/tags?post=2607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}