兼容ie9

npm i core-js --save

main.js 引入

// with polyfills
import 'core-js/stable'
import 'regenerator-runtime/runtime'

package.json

"browserslist": [
  "> 1%",
  "last 2 versions",
  "not ie <= 10"
],

vue.config.js

  transpileDependencies: [/node_modules[/\\\\](base64-js|crypto-js)[/\\\\]/],

babel.config.js

  presets: [
    // '@vue/cli-plugin-babel/preset',
    ["@babel/preset-env", {
      useBuiltIns: "entry", // or "usage"
      corejs: 3,
    }]
  ],