Element ui 按需引入

借助 babel-plugin-component

npm install babel-plugin-component -D

修改 babel.config.js

module.exports = {
  "presets": [
    "@vue/cli-plugin-babel/preset",
    ["@babel/preset-env", {"modules": false}]
  ],
  "plugins": [
    [
      "component",
      {
        "libraryName": "element-ui",
        "styleLibraryName": "theme-chalk"
      }
    ]
  ]
}

引入需要的组件

import {
    Container,
    Header,
    Aside,
    Main,
    Footer,
} from 'element-ui'

Vue.use(Container)
Vue.use(Header)
Vue.use(Aside)
Vue.use(Main)
Vue.use(Footer)