webpack代码分离CommonsChunkPlugin插件的使用（防止重复）

 1.webpack.config.js中添加：

const path = require('path');
+ const webpack = require('webpack');
  const HTMLWebpackPlugin = require('html-webpack-plugin');

  module.exports = {
    entry: {
      index: './src/index.js',
      another: './src/another-module.js'
    },
    plugins: [
      new HTMLWebpackPlugin({
        title: 'Code Splitting'
-     })
+     }),
+ new webpack.optimize.CommonsChunkPlugin({ + name: 'common' // 指定公共 bundle 的名称。 + }) ], output: { filename: '[name].bundle.js', path: path.resolve(__dirname, 'dist') } };