vue项目中按需引入element-ui的正确实现方法

vue create test

npm install babel-plugin-component -D

npm install element-ui -S

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

import Vue from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
import { Button, Input } from 'element-ui'; // 按需引入组件
// 注册全局组件
Vue.component(Button.name, Button);
Vue.component(Input.name, Input);

 
Vue.config.productionTip = false
 
new Vue({
  router,
  store,
  render: h => h(App)
}).$mount('#app')

<template>
  <div>
    <!-- <input type="text" placeholder="请输入任务"> -->
    <el-input v-model="input" placeholder="请输入内容"></el-input>
  </div>
</template>
 
<script>
  export default {
    name: 'MyHeader',
    data() {
      return {
        input: ''
      }
    }
  }
</script>
 
<style>
 
</style>

npm i element-ui -S

import Vue from 'vue'
import App from './App'

import ElementUI from 'element-ui'
import 'element-ui/lib/theme-chalk/index.CSS'
Vue.use(ElementUI)

Vue.config.productionTip = false

new Vue({
  el: '#app',
  components: { App },
  template: '<App/>'
})

npm install babel-plugin-component -D

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

// import ElementUI from 'element-ui'
// import 'element-ui/lib/theme-chalk/index.css'
// Vue.use(ElementUI)

import {
  Button,
  ButtonGroup,
} from 'element-ui';

Vue.use(Button).use(ButtonGroup)