1.babel将es6代码转换为es5
npm install --save-dev babel-loader @babel/core
npm install @babel/preset-env --save-dev
npm install --save @babel/polyfill
js代码
require("@babel/polyfill");
1 module:{ 2 rules:[ 3 { test: /.js$/, exclude: /node_modules/, loader: "babel-loader", 4 options:{ 5 "presets": [["@babel/preset-env",{ 6 useBuiltIns:"usage" 7 }]] 8 } 9 }, 10 ] 11 }