webpack 代码分割的两种方式

1. 多入口打包

适用于传统的多页应用程序，一个页面对应一个打包入口，公告部分单独提取

const { CleanWebpackPlugin } = require('clean-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  mode: 'none',
  entry: {
    index: './src/index.js',
    album: './src/album.js'
  },
  output: {
    filename: '[name].bundle.js'
  },
    ...
  plugins: [
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      title: 'Multi Entry',
      template: './src/index.html',
      filename: 'index.html',
      chunks: ['index']
    }),
    new HtmlWebpackPlugin({
      title: 'Multi Entry',
      template: './src/album.html',
      filename: 'album.html',
      chunks: ['album']
    })
  ]
}

1.1 提取公共模块

const { CleanWebpackPlugin } = require('clean-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  mode: 'none',
  entry: {
    index: './src/index.js',
    album: './src/album.js'
  },
  output: {
    filename: '[name].bundle.js'
  },
  optimization: {
    splitChunks: {
      // 自动提取所有公共模块到单独 bundle
      chunks: 'all'
    }
  },
  ...
}

2. 动态导入

按需加载，需要用到某个模块时，再加载这个模块，动态导入的模块会自动分包