create-react-app webpack配置打包清除co

可以在node_module/react-scripts/config/webpack.config.dev.js（跟webpack.config.prod.js）中看到：

修改成：

new webpack.optimize.UglifyJsPlugin({
        compress: {
          warnings: false,
          drop_debugger: true,
          drop_console: true,//不打印log
        },
      })

打包就ok了