elementUI按需引入

1、elementUI按需引入

npm i element-ui -S
npm install babel-plugin-component -D

2、.babelrc 文件修改

{
  //"presets": [["es2015", { "modules": false }]],
  "plugins": [
    [
      "component",
      {
        "libraryName": "element-ui",
        "styleLibraryName": "theme-chalk"
      }
    ]
  ]
}

3、main.js

import { Button, Select } from 'element-ui';
Vue.component(Button.name, Button);
Vue.component(Select.name, Select);
/* 或写为
 * Vue.use(Button)
 * Vue.use(Select)
 */