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                ## CommonsChunkPlugin [`CommonsChunkPlugin`](https://doc.webpack-china.org/plugins/commons-chunk-plugin) 是 webpack 內置的一個插件,可以用于將模塊分離到單獨的文件中。然而 `CommonsChunkPlugin` 有一個較少有人知道的功能是,能夠在每次修改后的構建結果中,將 webpack 的樣板(boilerplate)和 manifest 提取出來。通過指定 `entry` 配置中未用到的名稱,此插件會自動將我們需要的內容提取到單獨的包中: 在 `conf/webpack.config.js` 中配置: ``` const path = require('path'); const webpack = require('webpack'); const HtmlWebpackPlugin = require('html-webpack-plugin'); const CleanWebpackPlugin = require('clean-webpack-plugin'); module.exports = { entry: './src/main.js', output: { path: path.resolve(__dirname, '..', 'dist'), filename: '[name].[chunkhash].js' }, plugins: [ new CleanWebpackPlugin(['dist'], { root: path.resolve(__dirname, '..'), exclude: [], verbose: true, dry: false }), new HtmlWebpackPlugin({ title: 'Output Management' }), new webpack.optimize.CommonsChunkPlugin({ name: 'manifest' }) ] }; ``` ### vendor 將第三方庫(library)(例如 `lodash` 或 `react`)提取到單獨的 `vendor` chunk 文件中,是比較推薦的做法,這是因為,它們很少像本地的源代碼那樣頻繁修改。因此通過實現以上步驟,利用客戶端的長效緩存機制,可以通過命中緩存來消除請求,并減少向服務器獲取資源,同時還能保證客戶端代碼和服務器端代碼版本一致。這可以通過使用新的 `entry(入口)` 起點,以及再額外配置一個 `CommonsChunkPlugin` 實例的組合方式來實現: **webpack.config.js** ``` const path = require('path'); const webpack = require('webpack'); const HtmlWebpackPlugin = require('html-webpack-plugin'); const CleanWebpackPlugin = require('clean-webpack-plugin'); module.exports = { entry: { main: './src/main.js', vendor: [ 'lodash' ] }, output: { path: path.resolve(__dirname, '..', 'dist'), filename: '[name].[chunkhash].js' }, plugins: [ new CleanWebpackPlugin(['dist'], { root: path.resolve(__dirname, '..'), exclude: [], verbose: true, dry: false }), new HtmlWebpackPlugin({ title: 'Output Management' }), new webpack.optimize.CommonsChunkPlugin({ name: 'vendor' }), new webpack.optimize.CommonsChunkPlugin({ name: 'manifest' }) ] }; ``` >[warning] 注意,引入順序在這里很重要。`CommonsChunkPlugin` 的 `'vendor'` 實例,必須在 `'manifest'` 實例之前引入。
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