element按需引入

1. 安装elementUi组件库 

   1. npm i element-ui -S

2. 安装 babel-plugin-component
1. 　　

   npm install babel-plugin-component -D

3. 修改babel.config.js文件

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

　　4.在mian.js中引入　　

import "element-ui/lib/theme-chalk/index.css";

import { Pagination } from "element-ui";

Vue.use(Pagination);