首先install babel

cnpm install --save-dev babel-loader babel-core babel-preset-env babel-plugin-transform-runtime babel-plugin-istanbul babel-polyfill babel-preset-stage-2 babel-register

webpack module配置

module: {
  rules: [
    {
      test: /\.vue$/,
      loader: 'vue-loader',
      options: {
        loaders: {
          scss: 'vue-style-loader!css-loader!sass-loader' // <style lang="scss">
        }
      }
    },
    {
      test: /\.js$/,
      exclude: /(node_modules|bower_components)/,
      loader: 'babel-loader'
    }
  ]
}

为了兼容ie 入口处加入 babel-polyfil

entry: {
  app: ['babel-polyfill', './src/main.js']
},

然后在根目录新建.babelrc文件 加入配置项

{
  "presets": [
    ["env", { "modules": false }],
    "stage-2"
  ],
  "plugins": ["transform-runtime"],
  "comments": false,
  "env": {
    "test": {
      "presets": ["env", "stage-2"],
      "plugins": [ "istanbul" ]
    }
  }
}