1、install uglifyjs-webpack-plugin,然后在build文件夹下的webpack.prod.conf.js文件里引入

const UglifyJsPlugin = require('uglifyjs-webpack-plugin')

2、在build文件夹下的webpack.prod.conf.js文件里的plugins下面添加:

new UglifyJsPlugin({
  uglifyOptions: {
    compress: {
      warnings: false,
      drop_debugger: true, // 打包去除 debugger
      drop_console: true // 打包去除 console
    }
  },
  sourceMap: config.build.productionSourceMap,
  parallel: true
}),
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