webpack 打包 UglifyJs 报错

Vue-cli 打包报错：
ERROR in static/js/4.784ab4a1238de8e94312.js from UglifyJs
Unexpected token:

原因：Uglify模块不能压缩es6的代码
解决：修改webpack.base.conf.js 转换出错文件

　　　　{
        test: /\.js$/,
        loader: 'babel-loader',
        include: [resolve('src'), resolve('test'),resolve('node_modules/browser-md5-file/dist')]
      }