ES6转ES5

npm install --save-dev babel-loader@7 babel-core babel-preset-es2015

或者

npm install babel-loader babel-core babel-preset-env webpack

 

 

{
      test: /\.js$/,
      exclude: /(node_modules|bower_components)/,
      use: {
        loader: 'babel-loader',
        options: {
          presets: ['es2015']
        }
      }
    }

官网

https://www.webpackjs.com/loaders/babel-loader/