第一步，安装babel-polyfill
npm i babel-polyfill --save-dev
第二步，在mainJs里引入
import 'babel-polyfill'
第三步，在webpack.base.conf.js里配置下列两项
entry: {
app: ['babel-polyfill', './src/main.js']
},
module: {
rules: [
{
test: /\.js$/,
loader: 'babel-loader',
include: [resolve('src'), resolve('test'), resolve('static'), resolve('node_modules/webpack-dev-server/client')]
}
]
}
第四步，重启
