vue3(optionApi)使用Element Plus库没有效果的解决方式

#先把npm镜像改为国内的
npm install -g cnpm --registry=https://registry.npm.taobao.org
 
#然后再下载就会快上许多
cnpm install element-plus --save

#先把npm镜像改为国内的
npm install -g cnpm --registry=https://registry.npm.taobao.org
 
#然后用cnpm安装yarn
cnpm install -g yarn
 
#把yarn镜像改为国内的
yarn config set registry https://registry.npm.taobao.org/
 
#然后再用yarn下载
yarn add element-plus

<template>
  <el-row>
    <el-button plain>Plain</el-button>
    <el-button type="primary" plain>Primary</el-button>
    <el-button type="success" plain>Success</el-button>
    <el-button type="info" plain>Info</el-button>
    <el-button type="warning" plain>Warning</el-button>
    <el-button type="danger" plain>Danger</el-button>
  </el-row>
</template>
<script>
import { ElButton,ElRow } from 'element-plus'
export default {
        components:{
            ElButton,
            ElRow
        }
}
</script>

import { createApp } from 'vue'
import App from './App.vue'
import 'element-plus/theme-chalk/index.css'
let app=createApp(App)
app.mount('#app')

import { createApp } from 'vue'
import App from './App.vue'
import 'element-plus/theme-chalk/index.css'
import { ElButton,ElRow } from 'element-plus'
let app=createApp(App)
app.use(ElButton,ElRow)
app.mount('#app')

<template>
  <el-row>
    <el-button plain>Plain</el-button>
    <el-button type="primary" plain>Primary</el-button>
    <el-button type="success" plain>Success</el-button>
    <el-button type="info" plain>Info</el-button>
    <el-button type="warning" plain>Warning</el-button>
    <el-button type="danger" plain>Danger</el-button>
  </el-row>
</template>
<script>
</script>