webpack 代码分离

报错信息：

Error: webpack.optimize.CommonsChunkPlugin has been removed, please use config.optimization.splitChunks instead.

问题缘由：webpack 4版本废弃了 webpack.optimize.CommonsChunkPlugin, 可是中文网应用了该代码, 致使出错

解决办法：在webpack.config.js配置文件中 添加

optimization: { //   与  同一级别
    splitChunks: {
      cacheGroups: {
        commons: {
          name: "commons",
          chunks: "initial",
          minChunks: 2
        }
      }
    }
  }optimizationentry、plugins