4-10使用TreeShaking.html 40 KB

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  1. <!DOCTYPE HTML>
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  6. <title>4-10 使用 Tree Shaking · 深入浅出 Webpack</title>
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  46. 深入浅出 Webpack
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  49. <li class="chapter " data-level="1.2" data-path="../前言.html">
  50. <a href="../前言.html">
  51. 前言
  52. </a>
  53. </li>
  54. <li class="chapter " data-level="1.3" data-path="../1入门/">
  55. <a href="../1入门/">
  56. 第1章 入门
  57. </a>
  58. <ul class="articles">
  59. <li class="chapter " data-level="1.3.1" data-path="../1入门/1-1前端的发展.html">
  60. <a href="../1入门/1-1前端的发展.html">
  61. 1-1 前端的发展
  62. </a>
  63. </li>
  64. <li class="chapter " data-level="1.3.2" data-path="../1入门/1-2常见的构建工具及对比.html">
  65. <a href="../1入门/1-2常见的构建工具及对比.html">
  66. 1-2 常见的构建工具及对比
  67. </a>
  68. </li>
  69. <li class="chapter " data-level="1.3.3" data-path="../1入门/1-3安装与使用.html">
  70. <a href="../1入门/1-3安装与使用.html">
  71. 1-3 安装与使用
  72. </a>
  73. </li>
  74. <li class="chapter " data-level="1.3.4" data-path="../1入门/1-4使用Loader.html">
  75. <a href="../1入门/1-4使用Loader.html">
  76. 1-4 使用 Loader
  77. </a>
  78. </li>
  79. <li class="chapter " data-level="1.3.5" data-path="../1入门/1-5使用Plugin.html">
  80. <a href="../1入门/1-5使用Plugin.html">
  81. 1-5 使用 Plugin
  82. </a>
  83. </li>
  84. <li class="chapter " data-level="1.3.6" data-path="../1入门/1-6使用DevServer.html">
  85. <a href="../1入门/1-6使用DevServer.html">
  86. 1-6 使用 DevServer
  87. </a>
  88. </li>
  89. <li class="chapter " data-level="1.3.7" data-path="../1入门/1-7核心概念.html">
  90. <a href="../1入门/1-7核心概念.html">
  91. 1-7 核心概念
  92. </a>
  93. </li>
  94. </ul>
  95. </li>
  96. <li class="chapter " data-level="1.4" data-path="../2配置/">
  97. <a href="../2配置/">
  98. 第2章 配置
  99. </a>
  100. <ul class="articles">
  101. <li class="chapter " data-level="1.4.1" data-path="../2配置/2-1Entry.html">
  102. <a href="../2配置/2-1Entry.html">
  103. 2-1 Entry
  104. </a>
  105. </li>
  106. <li class="chapter " data-level="1.4.2" data-path="../2配置/2-2Output.html">
  107. <a href="../2配置/2-2Output.html">
  108. 2-2 Output
  109. </a>
  110. </li>
  111. <li class="chapter " data-level="1.4.3" data-path="../2配置/2-3Module.html">
  112. <a href="../2配置/2-3Module.html">
  113. 2-3 Module
  114. </a>
  115. </li>
  116. <li class="chapter " data-level="1.4.4" data-path="../2配置/2-4Resolve.html">
  117. <a href="../2配置/2-4Resolve.html">
  118. 2-4 Resolve
  119. </a>
  120. </li>
  121. <li class="chapter " data-level="1.4.5" data-path="../2配置/2-5Plugins.html">
  122. <a href="../2配置/2-5Plugins.html">
  123. 2-5 Plugins
  124. </a>
  125. </li>
  126. <li class="chapter " data-level="1.4.6" data-path="../2配置/2-6DevServer.html">
  127. <a href="../2配置/2-6DevServer.html">
  128. 2-6 DevServer
  129. </a>
  130. </li>
  131. <li class="chapter " data-level="1.4.7" data-path="../2配置/2-7其它配置项.html">
  132. <a href="../2配置/2-7其它配置项.html">
  133. 2-7 其它配置项
  134. </a>
  135. </li>
  136. <li class="chapter " data-level="1.4.8" data-path="../2配置/2-8整体配置结构.html">
  137. <a href="../2配置/2-8整体配置结构.html">
  138. 2-8 整体配置结构
  139. </a>
  140. </li>
  141. <li class="chapter " data-level="1.4.9" data-path="../2配置/2-9多种配置类型.html">
  142. <a href="../2配置/2-9多种配置类型.html">
  143. 2-9 多种配置类型
  144. </a>
  145. </li>
  146. <li class="chapter " data-level="1.4.10" data-path="../2配置/2-10配置总结.html">
  147. <a href="../2配置/2-10配置总结.html">
  148. 2-10 配置总结
  149. </a>
  150. </li>
  151. </ul>
  152. </li>
  153. <li class="chapter " data-level="1.5" data-path="../3实战/">
  154. <a href="../3实战/">
  155. 第3章 实战
  156. </a>
  157. <ul class="articles">
  158. <li class="chapter " data-level="1.5.1" data-path="../3实战/3-1使用ES6语言.html">
  159. <a href="../3实战/3-1使用ES6语言.html">
  160. 3-1 使用 ES6 语言
  161. </a>
  162. </li>
  163. <li class="chapter " data-level="1.5.2" data-path="../3实战/3-2使用TypeScript语言.html">
  164. <a href="../3实战/3-2使用TypeScript语言.html">
  165. 3-2 使用 TypeScript 语言
  166. </a>
  167. </li>
  168. <li class="chapter " data-level="1.5.3" data-path="../3实战/3-3使用Flow检查器.html">
  169. <a href="../3实战/3-3使用Flow检查器.html">
  170. 3-3 使用 Flow 检查器
  171. </a>
  172. </li>
  173. <li class="chapter " data-level="1.5.4" data-path="../3实战/3-4使用SCSS语言.html">
  174. <a href="../3实战/3-4使用SCSS语言.html">
  175. 3-4 使用 SCSS
  176. </a>
  177. </li>
  178. <li class="chapter " data-level="1.5.5" data-path="../3实战/3-5使用PostCSS.html">
  179. <a href="../3实战/3-5使用PostCSS.html">
  180. 3-5 使用 PostCSS
  181. </a>
  182. </li>
  183. <li class="chapter " data-level="1.5.6" data-path="../3实战/3-6使用React框架.html">
  184. <a href="../3实战/3-6使用React框架.html">
  185. 3-6 使用 React 框架
  186. </a>
  187. </li>
  188. <li class="chapter " data-level="1.5.7" data-path="../3实战/3-7使用Vue框架.html">
  189. <a href="../3实战/3-7使用Vue框架.html">
  190. 3-7 使用 Vue 框架
  191. </a>
  192. </li>
  193. <li class="chapter " data-level="1.5.8" data-path="../3实战/3-8使用Angular2框架.html">
  194. <a href="../3实战/3-8使用Angular2框架.html">
  195. 3-8 使用 Angular2 框架
  196. </a>
  197. </li>
  198. <li class="chapter " data-level="1.5.9" data-path="../3实战/3-9为单页应用生成HTML.html">
  199. <a href="../3实战/3-9为单页应用生成HTML.html">
  200. 3-9 为单页应用生成 HTML
  201. </a>
  202. </li>
  203. <li class="chapter " data-level="1.5.10" data-path="../3实战/3-10管理多个单页应用.html">
  204. <a href="../3实战/3-10管理多个单页应用.html">
  205. 3-10 管理多个单页应用
  206. </a>
  207. </li>
  208. <li class="chapter " data-level="1.5.11" data-path="../3实战/3-11构建同构应用.html">
  209. <a href="../3实战/3-11构建同构应用.html">
  210. 3-11 构建同构应用
  211. </a>
  212. </li>
  213. <li class="chapter " data-level="1.5.12" data-path="../3实战/3-12构建Electron应用.html">
  214. <a href="../3实战/3-12构建Electron应用.html">
  215. 3-12 构建 Electron 应用
  216. </a>
  217. </li>
  218. <li class="chapter " data-level="1.5.13" data-path="../3实战/3-13构建Npm模块.html">
  219. <a href="../3实战/3-13构建Npm模块.html">
  220. 3-13 构建 Npm 模块
  221. </a>
  222. </li>
  223. <li class="chapter " data-level="1.5.14" data-path="../3实战/3-14构建离线应用.html">
  224. <a href="../3实战/3-14构建离线应用.html">
  225. 3-14 构建离线应用
  226. </a>
  227. </li>
  228. <li class="chapter " data-level="1.5.15" data-path="../3实战/3-15搭配NpmScript.html">
  229. <a href="../3实战/3-15搭配NpmScript.html">
  230. 3-15 搭配 Npm Script
  231. </a>
  232. </li>
  233. <li class="chapter " data-level="1.5.16" data-path="../3实战/3-16检查代码.html">
  234. <a href="../3实战/3-16检查代码.html">
  235. 3-16 检查代码
  236. </a>
  237. </li>
  238. <li class="chapter " data-level="1.5.17" data-path="../3实战/3-17通过Node.jsAPI启动Webpack.html">
  239. <a href="../3实战/3-17通过Node.jsAPI启动Webpack.html">
  240. 3-17 通过 Node.js API 启动 Webpack
  241. </a>
  242. </li>
  243. <li class="chapter " data-level="1.5.18" data-path="../3实战/3-18使用WebpackDevMiddleware.html">
  244. <a href="../3实战/3-18使用WebpackDevMiddleware.html">
  245. 3-18 使用 Webpack Dev Middleware
  246. </a>
  247. </li>
  248. <li class="chapter " data-level="1.5.19" data-path="../3实战/3-19加载图片.html">
  249. <a href="../3实战/3-19加载图片.html">
  250. 3-19 加载图片
  251. </a>
  252. </li>
  253. <li class="chapter " data-level="1.5.20" data-path="../3实战/3-20加载SVG.html">
  254. <a href="../3实战/3-20加载SVG.html">
  255. 3-20 加载SVG
  256. </a>
  257. </li>
  258. <li class="chapter " data-level="1.5.21" data-path="../3实战/3-21加载SourceMap.html">
  259. <a href="../3实战/3-21加载SourceMap.html">
  260. 3-21 加载 Source Map
  261. </a>
  262. </li>
  263. <li class="chapter " data-level="1.5.22" data-path="../3实战/3-22实战总结.html">
  264. <a href="../3实战/3-22实战总结.html">
  265. 3-22 实战总结
  266. </a>
  267. </li>
  268. </ul>
  269. </li>
  270. <li class="chapter " data-level="1.6" data-path="./">
  271. <a href="./">
  272. 第4章 优化
  273. </a>
  274. <ul class="articles">
  275. <li class="chapter " data-level="1.6.1" data-path="4-1缩小文件搜索范围.html">
  276. <a href="4-1缩小文件搜索范围.html">
  277. 4-1 缩小文件搜索范围
  278. </a>
  279. </li>
  280. <li class="chapter " data-level="1.6.2" data-path="4-2使用DllPlugin.html">
  281. <a href="4-2使用DllPlugin.html">
  282. 4-2 使用 DllPlugin
  283. </a>
  284. </li>
  285. <li class="chapter " data-level="1.6.3" data-path="4-3使用HappyPack.html">
  286. <a href="4-3使用HappyPack.html">
  287. 4-3 使用 HappyPack
  288. </a>
  289. </li>
  290. <li class="chapter " data-level="1.6.4" data-path="4-4使用ParallelUglifyPlugin.html">
  291. <a href="4-4使用ParallelUglifyPlugin.html">
  292. 4-4 使用 ParallelUglifyPlugin
  293. </a>
  294. </li>
  295. <li class="chapter " data-level="1.6.5" data-path="4-5使用自动刷新.html">
  296. <a href="4-5使用自动刷新.html">
  297. 4-5 使用自动刷新
  298. </a>
  299. </li>
  300. <li class="chapter " data-level="1.6.6" data-path="4-6开启模块热替换.html">
  301. <a href="4-6开启模块热替换.html">
  302. 4-6 开启模块热替换
  303. </a>
  304. </li>
  305. <li class="chapter " data-level="1.6.7" data-path="4-7区分环境.html">
  306. <a href="4-7区分环境.html">
  307. 4-7 区分环境
  308. </a>
  309. </li>
  310. <li class="chapter " data-level="1.6.8" data-path="4-8压缩代码.html">
  311. <a href="4-8压缩代码.html">
  312. 4-8 压缩代码
  313. </a>
  314. </li>
  315. <li class="chapter " data-level="1.6.9" data-path="4-9CDN加速.html">
  316. <a href="4-9CDN加速.html">
  317. 4-9 CDN 加速
  318. </a>
  319. </li>
  320. <li class="chapter active" data-level="1.6.10" data-path="4-10使用TreeShaking.html">
  321. <a href="4-10使用TreeShaking.html">
  322. 4-10 使用 Tree Shaking
  323. </a>
  324. </li>
  325. <li class="chapter " data-level="1.6.11" data-path="4-11提取公共代码.html">
  326. <a href="4-11提取公共代码.html">
  327. 4-11 提取公共代码
  328. </a>
  329. </li>
  330. <li class="chapter " data-level="1.6.12" data-path="4-12按需加载.html">
  331. <a href="4-12按需加载.html">
  332. 4-12 按需加载
  333. </a>
  334. </li>
  335. <li class="chapter " data-level="1.6.13" data-path="4-13使用Prepack.html">
  336. <a href="4-13使用Prepack.html">
  337. 4-13 使用 Prepack
  338. </a>
  339. </li>
  340. <li class="chapter " data-level="1.6.14" data-path="4-14开启ScopeHoisting.html">
  341. <a href="4-14开启ScopeHoisting.html">
  342. 4-14 开启 Scope Hoisting
  343. </a>
  344. </li>
  345. <li class="chapter " data-level="1.6.15" data-path="4-15输出分析.html">
  346. <a href="4-15输出分析.html">
  347. 4-15 输出分析
  348. </a>
  349. </li>
  350. <li class="chapter " data-level="1.6.16" data-path="4-16优化总结.html">
  351. <a href="4-16优化总结.html">
  352. 4-16 优化总结
  353. </a>
  354. </li>
  355. </ul>
  356. </li>
  357. <li class="chapter " data-level="1.7" data-path="../5原理/">
  358. <a href="../5原理/">
  359. 第5章 原理
  360. </a>
  361. <ul class="articles">
  362. <li class="chapter " data-level="1.7.1" data-path="../5原理/5-1工作原理概括.html">
  363. <a href="../5原理/5-1工作原理概括.html">
  364. 5-1 工作原理概括
  365. </a>
  366. </li>
  367. <li class="chapter " data-level="1.7.2" data-path="../5原理/5-2输出文件分析.html">
  368. <a href="../5原理/5-2输出文件分析.html">
  369. 5-2 输出文件分析
  370. </a>
  371. </li>
  372. <li class="chapter " data-level="1.7.3" data-path="../5原理/5-3编写Loader.html">
  373. <a href="../5原理/5-3编写Loader.html">
  374. 5-3 编写 Loader
  375. </a>
  376. </li>
  377. <li class="chapter " data-level="1.7.4" data-path="../5原理/5-4编写Plugin.html">
  378. <a href="../5原理/5-4编写Plugin.html">
  379. 5-4 编写 Plugin
  380. </a>
  381. </li>
  382. <li class="chapter " data-level="1.7.5" data-path="../5原理/5-5调试Webpack.html">
  383. <a href="../5原理/5-5调试Webpack.html">
  384. 5-5 调试 Webpack
  385. </a>
  386. </li>
  387. <li class="chapter " data-level="1.7.6" data-path="../5原理/5-6原理总结.html">
  388. <a href="../5原理/5-6原理总结.html">
  389. 5-6 原理总结
  390. </a>
  391. </li>
  392. </ul>
  393. </li>
  394. <li class="chapter " data-level="1.8" >
  395. <span>
  396. 附录
  397. </span>
  398. <ul class="articles">
  399. <li class="chapter " data-level="1.8.1" data-path="../附录/常用Loaders.html">
  400. <a href="../附录/常用Loaders.html">
  401. 常用 Loaders
  402. </a>
  403. </li>
  404. <li class="chapter " data-level="1.8.2" data-path="../附录/常用Plugins.html">
  405. <a href="../附录/常用Plugins.html">
  406. 常用 Plugins
  407. </a>
  408. </li>
  409. <li class="chapter " data-level="1.8.3" data-path="../附录/其它Webpack学习资源.html">
  410. <a href="../附录/其它Webpack学习资源.html">
  411. 其它 Webpack 学习资源
  412. </a>
  413. </li>
  414. </ul>
  415. </li>
  416. <li class="divider"></li>
  417. <li id="codefund_ad">
  418. <script src="https://codesponsor.io/scripts/5da524c5-301a-4ef4-8b42-696edd22e693/embed.js"></script>
  419. </li>
  420. </ul>
  421. </nav>
  422. </div>
  423. <div class="book-body">
  424. <div class="body-inner">
  425. <div class="book-header" role="navigation">
  426. <!-- Title -->
  427. <h1>
  428. <i class="fa fa-circle-o-notch fa-spin"></i>
  429. <a href=".." >4-10 使用 Tree Shaking</a>
  430. </h1>
  431. </div>
  432. <div class="page-wrapper" tabindex="-1" role="main">
  433. <div class="page-inner">
  434. <div id="book-search-results">
  435. <div class="search-noresults">
  436. <section class="normal markdown-section">
  437. <h1 id="4-10-&#x4F7F;&#x7528;-tree-shaking">4-10 &#x4F7F;&#x7528; Tree Shaking</h1>
  438. <h2 id="&#x8BA4;&#x8BC6;-tree-shaking">&#x8BA4;&#x8BC6; Tree Shaking</h2>
  439. <p>Tree Shaking &#x53EF;&#x4EE5;&#x7528;&#x6765;&#x5254;&#x9664; JavaScript &#x4E2D;&#x7528;&#x4E0D;&#x4E0A;&#x7684;&#x6B7B;&#x4EE3;&#x7801;&#x3002;&#x5B83;&#x4F9D;&#x8D56;&#x9759;&#x6001;&#x7684; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#xFF0C;&#x4F8B;&#x5982;&#x901A;&#x8FC7; <code>import</code> &#x548C; <code>export</code> &#x5BFC;&#x5165;&#x5BFC;&#x51FA;&#x3002;
  440. Tree Shaking &#x6700;&#x5148;&#x5728; Rollup &#x4E2D;&#x51FA;&#x73B0;&#xFF0C;Webpack &#x5728; 2.0 &#x7248;&#x672C;&#x4E2D;&#x5C06;&#x5176;&#x5F15;&#x5165;&#x3002;</p>
  441. <p>&#x4E3A;&#x4E86;&#x66F4;&#x76F4;&#x89C2;&#x7684;&#x7406;&#x89E3;&#x5B83;&#xFF0C;&#x6765;&#x770B;&#x4E00;&#x4E2A;&#x5177;&#x4F53;&#x7684;&#x4F8B;&#x5B50;&#x3002;&#x5047;&#x5982;&#x6709;&#x4E00;&#x4E2A;&#x6587;&#x4EF6; <code>util.js</code> &#x91CC;&#x5B58;&#x653E;&#x4E86;&#x5F88;&#x591A;&#x5DE5;&#x5177;&#x51FD;&#x6570;&#x548C;&#x5E38;&#x91CF;&#xFF0C;&#x5728; <code>main.js</code> &#x4E2D;&#x4F1A;&#x5BFC;&#x5165;&#x548C;&#x4F7F;&#x7528; <code>util.js</code>&#xFF0C;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
  442. <p><code>util.js</code> &#x6E90;&#x7801;&#xFF1A;</p>
  443. <pre><code class="lang-js"><span class="hljs-keyword">export</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">funcA</span>(<span class="hljs-params"></span>) </span>{
  444. }
  445. <span class="hljs-keyword">export</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">funB</span>(<span class="hljs-params"></span>) </span>{
  446. }
  447. <span class="hljs-keyword">export</span> <span class="hljs-keyword">const</span> a = <span class="hljs-string">&apos;a&apos;</span>;
  448. </code></pre>
  449. <p><code>main.js</code> &#x6E90;&#x7801;&#xFF1A;</p>
  450. <pre><code class="lang-js"><span class="hljs-keyword">import</span> {funcA} <span class="hljs-keyword">from</span> <span class="hljs-string">&apos;./util.js&apos;</span>;
  451. funcA();
  452. </code></pre>
  453. <p>Tree Shaking &#x540E;&#x7684; <code>util.js</code>&#xFF1A;</p>
  454. <pre><code class="lang-js"><span class="hljs-keyword">export</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">funcA</span>(<span class="hljs-params"></span>) </span>{
  455. }
  456. </code></pre>
  457. <p>&#x7531;&#x4E8E;&#x53EA;&#x7528;&#x5230;&#x4E86; <code>util.js</code> &#x4E2D;&#x7684; <code>funcA</code>&#xFF0C;&#x6240;&#x4EE5;&#x5269;&#x4E0B;&#x7684;&#x90FD;&#x88AB; Tree Shaking &#x5F53;&#x4F5C;&#x6B7B;&#x4EE3;&#x7801;&#x7ED9;&#x5254;&#x9664;&#x4E86;&#x3002;</p>
  458. <p>&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#x8981;&#x8BA9; Tree Shaking &#x6B63;&#x5E38;&#x5DE5;&#x4F5C;&#x7684;&#x524D;&#x63D0;&#x662F;&#x4EA4;&#x7ED9; Webpack &#x7684; JavaScript &#x4EE3;&#x7801;&#x5FC5;&#x987B;&#x662F;&#x91C7;&#x7528; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#x7684;&#xFF0C;
  459. &#x56E0;&#x4E3A; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#x662F;&#x9759;&#x6001;&#x7684;&#xFF08;&#x5BFC;&#x5165;&#x5BFC;&#x51FA;&#x8BED;&#x53E5;&#x4E2D;&#x7684;&#x8DEF;&#x5F84;&#x5FC5;&#x987B;&#x662F;&#x9759;&#x6001;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x800C;&#x4E14;&#x4E0D;&#x80FD;&#x653E;&#x5165;&#x5176;&#x5B83;&#x4EE3;&#x7801;&#x5757;&#x4E2D;&#xFF09;&#xFF0C;&#x8FD9;&#x8BA9; Webpack &#x53EF;&#x4EE5;&#x7B80;&#x5355;&#x7684;&#x5206;&#x6790;&#x51FA;&#x54EA;&#x4E9B; <code>export</code> &#x7684;&#x88AB; <code>import</code> &#x8FC7;&#x4E86;&#x3002;
  460. &#x5982;&#x679C;&#x4F60;&#x91C7;&#x7528; ES5 &#x4E2D;&#x7684;&#x6A21;&#x5757;&#x5316;&#xFF0C;&#x4F8B;&#x5982; <code>module.export={...}</code>&#x3001;<code>require(x+y)</code>&#x3001;<code>if(x){require(&apos;./util&apos;)}</code>&#xFF0C;Webpack &#x65E0;&#x6CD5;&#x5206;&#x6790;&#x51FA;&#x54EA;&#x4E9B;&#x4EE3;&#x7801;&#x53EF;&#x4EE5;&#x5254;&#x9664;&#x3002;</p>
  461. <blockquote>
  462. <p>&#x76EE;&#x524D;&#x7684; Tree Shaking &#x8FD8;&#x6709;&#x4E9B;&#x7684;&#x5C40;&#x9650;&#x6027;&#xFF0C;&#x7ECF;&#x5B9E;&#x9A8C;&#x53D1;&#x73B0;&#xFF1A;</p>
  463. <ol>
  464. <li>&#x4E0D;&#x4F1A;&#x5BF9;entry&#x5165;&#x53E3;&#x6587;&#x4EF6;&#x505A; Tree Shaking&#x3002;</li>
  465. <li>&#x4E0D;&#x4F1A;&#x5BF9;<a href="4-12&#x6309;&#x9700;&#x52A0;&#x8F7D;.html">&#x5F02;&#x6B65;&#x5206;&#x5272;</a>&#x51FA;&#x53BB;&#x7684;&#x4EE3;&#x7801;&#x505A; Tree Shaking&#x3002;</li>
  466. </ol>
  467. </blockquote>
  468. <h2 id="&#x63A5;&#x5165;-tree-shaking">&#x63A5;&#x5165; Tree Shaking</h2>
  469. <p>&#x4E0A;&#x9762;&#x8BB2;&#x4E86; Tree Shaking &#x662F;&#x505A;&#x4EC0;&#x4E48;&#x7684;&#xFF0C;&#x63A5;&#x4E0B;&#x6765;&#x4E00;&#x6B65;&#x6B65;&#x6559;&#x4F60;&#x5982;&#x4F55;&#x914D;&#x7F6E; Webpack &#x8BA9; Tree Shaking &#x751F;&#x6548;&#x3002;</p>
  470. <p>&#x9996;&#x5148;&#xFF0C;&#x4E3A;&#x4E86;&#x628A;&#x91C7;&#x7528; ES6 &#x6A21;&#x5757;&#x5316;&#x7684;&#x4EE3;&#x7801;&#x4EA4;&#x7ED9; Webpack&#xFF0C;&#x9700;&#x8981;&#x914D;&#x7F6E; Babel &#x8BA9;&#x5176;&#x4FDD;&#x7559; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x53E5;&#xFF0C;&#x4FEE;&#x6539; <code>.babelrc</code> &#x6587;&#x4EF6;&#x4E3A;&#x5982;&#x4E0B;&#xFF1A;</p>
  471. <pre><code class="lang-json">{
  472. <span class="hljs-string">&quot;presets&quot;</span>: [
  473. [
  474. <span class="hljs-string">&quot;env&quot;</span>,
  475. {
  476. <span class="hljs-string">&quot;modules&quot;</span>: <span class="hljs-literal">false</span>
  477. }
  478. ]
  479. ]
  480. }
  481. </code></pre>
  482. <p>&#x5176;&#x4E2D; <code>&quot;modules&quot;: false</code> &#x7684;&#x542B;&#x4E49;&#x662F;&#x5173;&#x95ED; Babel &#x7684;&#x6A21;&#x5757;&#x8F6C;&#x6362;&#x529F;&#x80FD;&#xFF0C;&#x4FDD;&#x7559;&#x539F;&#x672C;&#x7684; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#x3002;</p>
  483. <p>&#x914D;&#x7F6E;&#x597D; Babel &#x540E;&#xFF0C;&#x91CD;&#x65B0;&#x8FD0;&#x884C; Webpack&#xFF0C;&#x5728;&#x542F;&#x52A8; Webpack &#x65F6;&#x5E26;&#x4E0A; <code>--display-used-exports</code> &#x53C2;&#x6570;&#xFF0C;&#x4EE5;&#x65B9;&#x4FBF;&#x8FFD;&#x8E2A; Tree Shaking &#x7684;&#x5DE5;&#x4F5C;&#xFF0C;
  484. &#x8FD9;&#x65F6;&#x4F60;&#x4F1A;&#x53D1;&#x73B0;&#x5728;&#x63A7;&#x5236;&#x53F0;&#x4E2D;&#x8F93;&#x51FA;&#x4E86;&#x5982;&#x4E0B;&#x7684;&#x65E5;&#x5FD7;&#xFF1A;</p>
  485. <pre><code>&gt; webpack --display-used-exports
  486. bundle.js 3.5 kB 0 [emitted] main
  487. [0] ./main.js 41 bytes {0} [built]
  488. [1] ./util.js 511 bytes {0} [built]
  489. [only some exports used: funcA]
  490. </code></pre><p>&#x5176;&#x4E2D; <code>[only some exports used: funcA]</code> &#x63D0;&#x793A;&#x4E86; <code>util.js</code> &#x53EA;&#x5BFC;&#x51FA;&#x4E86;&#x7528;&#x5230;&#x7684; <code>funcA</code>&#xFF0C;&#x8BF4;&#x660E; Webpack &#x786E;&#x5B9E;&#x6B63;&#x786E;&#x7684;&#x5206;&#x6790;&#x51FA;&#x4E86;&#x5982;&#x4F55;&#x5254;&#x9664;&#x6B7B;&#x4EE3;&#x7801;&#x3002;</p>
  491. <p>&#x4F46;&#x5F53;&#x4F60;&#x6253;&#x5F00; Webpack &#x8F93;&#x51FA;&#x7684; <code>bundle.js</code> &#x6587;&#x4EF6;&#x770B;&#x4E0B;&#x65F6;&#xFF0C;&#x4F60;&#x4F1A;&#x53D1;&#x73B0;&#x7528;&#x4E0D;&#x4E0A;&#x7684;&#x4EE3;&#x7801;&#x8FD8;&#x5728;&#x91CC;&#x9762;&#xFF0C;&#x5982;&#x4E0B;&#xFF1A;</p>
  492. <pre><code class="lang-js"><span class="hljs-comment">/* harmony export (immutable) */</span>
  493. __webpack_exports__[<span class="hljs-string">&quot;a&quot;</span>] = funcA;
  494. <span class="hljs-comment">/* unused harmony export funB */</span>
  495. <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">funcA</span>(<span class="hljs-params"></span>) </span>{
  496. <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;funcA&apos;</span>);
  497. }
  498. <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">funB</span>(<span class="hljs-params"></span>) </span>{
  499. <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;funcB&apos;</span>);
  500. }
  501. </code></pre>
  502. <p>Webpack &#x53EA;&#x662F;&#x6307;&#x51FA;&#x4E86;&#x54EA;&#x4E9B;&#x51FD;&#x6570;&#x7528;&#x4E0A;&#x4E86;&#x54EA;&#x4E9B;&#x6CA1;&#x7528;&#x4E0A;&#xFF0C;&#x8981;&#x5254;&#x9664;&#x7528;&#x4E0D;&#x4E0A;&#x7684;&#x4EE3;&#x7801;&#x8FD8;&#x5F97;&#x7ECF;&#x8FC7; UglifyJS &#x53BB;&#x5904;&#x7406;&#x4E00;&#x904D;&#x3002;
  503. &#x8981;&#x63A5;&#x5165; UglifyJS &#x4E5F;&#x5F88;&#x7B80;&#x5355;&#xFF0C;&#x4E0D;&#x4EC5;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;<a href="4-8&#x538B;&#x7F29;&#x4EE3;&#x7801;.html">4-8&#x538B;&#x7F29;&#x4EE3;&#x7801;</a>&#x4E2D;&#x4ECB;&#x7ECD;&#x7684;&#x52A0;&#x5165; UglifyJSPlugin &#x53BB;&#x5B9E;&#x73B0;&#xFF0C;
  504. &#x4E5F;&#x53EF;&#x4EE5;&#x7B80;&#x5355;&#x7684;&#x901A;&#x8FC7;&#x5728;&#x542F;&#x52A8; Webpack &#x65F6;&#x5E26;&#x4E0A; <code>--optimize-minimize</code> &#x53C2;&#x6570;&#xFF0C;&#x4E3A;&#x4E86;&#x5FEB;&#x901F;&#x9A8C;&#x8BC1; Tree Shaking &#x6211;&#x4EEC;&#x91C7;&#x7528;&#x8F83;&#x7B80;&#x5355;&#x7684;&#x540E;&#x8005;&#x6765;&#x5B9E;&#x9A8C;&#x4E0B;&#x3002;</p>
  505. <p>&#x901A;&#x8FC7; <code>webpack --display-used-exports --optimize-minimize</code> &#x91CD;&#x542F; Webpack &#x540E;&#xFF0C;&#x6253;&#x5F00;&#x65B0;&#x8F93;&#x51FA;&#x7684; <code>bundle.js</code>&#xFF0C;&#x5185;&#x5BB9;&#x5982;&#x4E0B;&#xFF1A;</p>
  506. <pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">r</span>(<span class="hljs-params"></span>) </span>{
  507. <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&quot;funcA&quot;</span>)
  508. }
  509. t.a = r
  510. </code></pre>
  511. <p>&#x53EF;&#x4EE5;&#x770B;&#x51FA; Tree Shaking &#x786E;&#x5B9E;&#x505A;&#x5230;&#x4E86;&#xFF0C;&#x7528;&#x4E0D;&#x4E0A;&#x7684;&#x4EE3;&#x7801;&#x90FD;&#x88AB;&#x5254;&#x9664;&#x4E86;&#x3002;</p>
  512. <p>&#x5F53;&#x4F60;&#x7684;&#x9879;&#x76EE;&#x4F7F;&#x7528;&#x4E86;&#x5927;&#x91CF;&#x7B2C;&#x4E09;&#x65B9;&#x5E93;&#x65F6;&#xFF0C;&#x4F60;&#x4F1A;&#x53D1;&#x73B0; Tree Shaking &#x4F3C;&#x4E4E;&#x4E0D;&#x751F;&#x6548;&#x4E86;&#xFF0C;&#x539F;&#x56E0;&#x662F;&#x5927;&#x90E8;&#x5206; Npm &#x4E2D;&#x7684;&#x4EE3;&#x7801;&#x90FD;&#x662F;&#x91C7;&#x7528;&#x7684; CommonJS &#x8BED;&#x6CD5;&#xFF0C;
  513. &#x8FD9;&#x5BFC;&#x81F4; Tree Shaking &#x65E0;&#x6CD5;&#x6B63;&#x5E38;&#x5DE5;&#x4F5C;&#x800C;&#x964D;&#x7EA7;&#x5904;&#x7406;&#x3002;
  514. &#x4F46;&#x5E78;&#x8FD0;&#x7684;&#x65F6;&#x6709;&#x4E9B;&#x5E93;&#x8003;&#x8651;&#x5230;&#x4E86;&#x8FD9;&#x70B9;&#xFF0C;&#x8FD9;&#x4E9B;&#x5E93;&#x5728;&#x53D1;&#x5E03;&#x5230; Npm &#x4E0A;&#x65F6;&#x4F1A;&#x540C;&#x65F6;&#x63D0;&#x4F9B;&#x4E24;&#x4EFD;&#x4EE3;&#x7801;&#xFF0C;&#x4E00;&#x4EFD;&#x91C7;&#x7528; CommonJS &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#xFF0C;&#x4E00;&#x4EFD;&#x91C7;&#x7528; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#x3002;
  515. &#x5E76;&#x4E14;&#x5728; <code>package.json</code> &#x6587;&#x4EF6;&#x4E2D;&#x5206;&#x522B;&#x6307;&#x51FA;&#x8FD9;&#x4E24;&#x4EFD;&#x4EE3;&#x7801;&#x7684;&#x5165;&#x53E3;&#x3002;</p>
  516. <p>&#x4EE5; <code>redux</code> &#x5E93;&#x4E3A;&#x4F8B;&#xFF0C;&#x5176;&#x53D1;&#x5E03;&#x5230; Npm &#x4E0A;&#x7684;&#x76EE;&#x5F55;&#x7ED3;&#x6784;&#x4E3A;&#xFF1A;</p>
  517. <pre><code>node_modules/redux
  518. |-- es
  519. | |-- index.js # &#x91C7;&#x7528; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;
  520. |-- lib
  521. | |-- index.js # &#x91C7;&#x7528; ES5 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;
  522. |-- package.json
  523. </code></pre><p><code>package.json</code> &#x6587;&#x4EF6;&#x4E2D;&#x6709;&#x4E24;&#x4E2A;&#x5B57;&#x6BB5;&#xFF1A;</p>
  524. <pre><code class="lang-json">{
  525. <span class="hljs-string">&quot;main&quot;</span>: <span class="hljs-string">&quot;lib/index.js&quot;</span>, <span class="hljs-comment">// &#x6307;&#x660E;&#x91C7;&#x7528; CommonJS &#x6A21;&#x5757;&#x5316;&#x7684;&#x4EE3;&#x7801;&#x5165;&#x53E3;</span>
  526. <span class="hljs-string">&quot;jsnext:main&quot;</span>: <span class="hljs-string">&quot;es/index.js&quot;</span> <span class="hljs-comment">// &#x6307;&#x660E;&#x91C7;&#x7528; ES6 &#x6A21;&#x5757;&#x5316;&#x7684;&#x4EE3;&#x7801;&#x5165;&#x53E3;</span>
  527. }
  528. </code></pre>
  529. <p>&#x5728;<a href="../2&#x914D;&#x7F6E;/2-4Resolve.html#mainFields">2-4Resolve mainFields</a> &#x4E2D;&#x66FE;&#x4ECB;&#x7ECD;&#x8FC7; <code>mainFields</code> &#x7528;&#x4E8E;&#x914D;&#x7F6E;&#x91C7;&#x7528;&#x54EA;&#x4E2A;&#x5B57;&#x6BB5;&#x4F5C;&#x4E3A;&#x6A21;&#x5757;&#x7684;&#x5165;&#x53E3;&#x63CF;&#x8FF0;&#x3002;
  530. &#x4E3A;&#x4E86;&#x8BA9; Tree Shaking &#x5BF9; <code>redux</code> &#x751F;&#x6548;&#xFF0C;&#x9700;&#x8981;&#x914D;&#x7F6E; Webpack &#x7684;&#x6587;&#x4EF6;&#x5BFB;&#x627E;&#x89C4;&#x5219;&#x4E3A;&#x5982;&#x4E0B;&#xFF1A;</p>
  531. <pre><code class="lang-js"><span class="hljs-built_in">module</span>.exports = {
  532. resolve: {
  533. <span class="hljs-comment">// &#x9488;&#x5BF9; Npm &#x4E2D;&#x7684;&#x7B2C;&#x4E09;&#x65B9;&#x6A21;&#x5757;&#x4F18;&#x5148;&#x91C7;&#x7528; jsnext:main &#x4E2D;&#x6307;&#x5411;&#x7684; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#x7684;&#x6587;&#x4EF6;</span>
  534. mainFields: [<span class="hljs-string">&apos;jsnext:main&apos;</span>, <span class="hljs-string">&apos;browser&apos;</span>, <span class="hljs-string">&apos;main&apos;</span>]
  535. },
  536. };
  537. </code></pre>
  538. <p>&#x4EE5;&#x4E0A;&#x914D;&#x7F6E;&#x7684;&#x542B;&#x4E49;&#x662F;&#x4F18;&#x5148;&#x4F7F;&#x7528; <code>jsnext:main</code> &#x4F5C;&#x4E3A;&#x5165;&#x53E3;&#xFF0C;&#x5982;&#x679C;&#x4E0D;&#x5B58;&#x5728; <code>jsnext:main</code> &#x5C31;&#x91C7;&#x7528; <code>browser</code> &#x6216;&#x8005; <code>main</code> &#x4F5C;&#x4E3A;&#x5165;&#x53E3;&#x3002;
  539. &#x867D;&#x7136;&#x5E76;&#x4E0D;&#x662F;&#x6BCF;&#x4E2A; Npm &#x4E2D;&#x7684;&#x7B2C;&#x4E09;&#x65B9;&#x6A21;&#x5757;&#x90FD;&#x4F1A;&#x63D0;&#x4F9B; ES6 &#x6A21;&#x5757;&#x5316;&#x8BED;&#x6CD5;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x4F46;&#x5BF9;&#x4E8E;&#x63D0;&#x4F9B;&#x4E86;&#x7684;&#x4E0D;&#x80FD;&#x653E;&#x8FC7;&#xFF0C;&#x80FD;&#x4F18;&#x5316;&#x7684;&#x5C31;&#x4F18;&#x5316;&#x3002;</p>
  540. <p>&#x76EE;&#x524D;&#x8D8A;&#x6765;&#x8D8A;&#x591A;&#x7684; Npm &#x4E2D;&#x7684;&#x7B2C;&#x4E09;&#x65B9;&#x6A21;&#x5757;&#x8003;&#x8651;&#x5230;&#x4E86; Tree Shaking&#xFF0C;&#x5E76;&#x5BF9;&#x5176;&#x63D0;&#x4F9B;&#x4E86;&#x652F;&#x6301;&#x3002;
  541. &#x91C7;&#x7528; <code>jsnext:main</code> &#x4F5C;&#x4E3A; ES6 &#x6A21;&#x5757;&#x5316;&#x4EE3;&#x7801;&#x7684;&#x5165;&#x53E3;&#x662F;&#x793E;&#x533A;&#x7684;&#x4E00;&#x4E2A;&#x7EA6;&#x5B9A;&#xFF0C;&#x5047;&#x5982;&#x5C06;&#x6765;&#x4F60;&#x8981;&#x53D1;&#x5E03;&#x4E00;&#x4E2A;&#x5E93;&#x5230; Npm &#x65F6;&#xFF0C;&#x5E0C;&#x671B;&#x4F60;&#x80FD;&#x652F;&#x6301; Tree Shaking&#xFF0C;
  542. &#x4EE5;&#x8BA9; Tree Shaking &#x53D1;&#x6325;&#x66F4;&#x5927;&#x7684;&#x4F18;&#x5316;&#x6548;&#x679C;&#xFF0C;&#x8BA9;&#x66F4;&#x591A;&#x7684;&#x4EBA;&#x4E3A;&#x6B64;&#x53D7;&#x76CA;&#x3002;</p>
  543. <blockquote>
  544. <p>&#x672C;&#x5B9E;&#x4F8B;<a href="http://webpack.wuhaolin.cn/4-10&#x4F7F;&#x7528;TreeShaking.zip" target="_blank">&#x63D0;&#x4F9B;&#x9879;&#x76EE;&#x5B8C;&#x6574;&#x4EE3;&#x7801;</a></p>
  545. </blockquote>
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