为啥我引入的elment ui 元件都没有效果需要引入的文件都引入了

来源：2-7 顶部核心指标组件布局开发

OldStreet

2022-12-23

为啥我引入的elment ui 元件都没有效果

<el-row :gutter="12">

  <el-col :span="8">

    <el-card shadow="always"> 总是显示 </el-card>

  </el-col>

  <el-col :span="8">

    <el-card shadow="hover"> 鼠标悬浮时显示 </el-card>

  </el-col>

  <el-col :span="8">

    <el-card shadow="never"> 从不显示 </el-card>

  </el-col>

</el-row>

element.js ：
import Vue from 'vue’
import { Card, Row, Col } from ‘element-ui’

Vue.use(Card)
Vue.use(Row)
Vue.use(Col)

mani.js ：

import Vue from 'vue’
import App from './App.vue’
import router from './router’
import './plugins/element.js’
import './style/index.scss’
import Echarts from ‘echarts’

Vue.config.productionTip = false
Vue.prototype. $echarts = Echarts new Vue({ router, render: h => h(App) }).$ mount(’#app’)