问题说明

vue集成了elementplus

main.js

import { createApp } from 'vue'
import './style.css'
import App from './App.vue'
import router from './router'

import ElementPlus from 'element-plus'
import 'element-plus/dist/index.css'

var app = createApp(App)
app.use(router)
app.use(ElementPlus)

app.mount('#app')

使用了elementplus布局组件

<template>
  <el-container>
    <el-header>Header</el-header>
    <el-container>
      <el-aside width="200px">Aside</el-aside>
      <el-main>Main</el-main>
    </el-container>
  </el-container>
</template>

页面展示效果如下：

问题解决方法一：
在布局所在的文件中加入css

<template>
  <el-container>
    <el-header>Header</el-header>
    <el-container>
      <el-aside width="200px">Aside</el-aside>
      <el-main>Main</el-main>
    </el-container>
  </el-container>
</template>

<style>
  .el-header, .el-footer {
    background-color: #B3C0D1;
    color: #333;
    text-align: center;
    line-height: 60px;
  }

  .el-aside {
    background-color: #D3DCE6;
    color: #333;
    text-align: center;
    line-height: 200px;
  }

  .el-main {
    background-color: #E9EEF3;
    color: #333;
    text-align: center;
    line-height: 160px;
  }

  body > .el-container {
    margin-bottom: 40px;
  }

  .el-container:nth-child(5) .el-aside,
  .el-container:nth-child(6) .el-aside {
    line-height: 260px;
  }

  .el-container:nth-child(7) .el-aside {
    line-height: 320px;
  }
</style>

问题解决方法二：
在style.css中加入布局容器的css，在main.js中引入style.css

style.css

  .el-header, .el-footer {
    background-color: #B3C0D1;
    color: #333;
    text-align: center;
    line-height: 60px;
  }

  .el-aside {
    background-color: #D3DCE6;
    color: #333;
    text-align: center;
    line-height: 200px;
  }

  .el-main {
    background-color: #E9EEF3;
    color: #333;
    text-align: center;
    line-height: 160px;
  }

  body > .el-container {
    margin-bottom: 40px;
  }

  .el-container:nth-child(5) .el-aside,
  .el-container:nth-child(6) .el-aside {
    line-height: 260px;
  }

  .el-container:nth-child(7) .el-aside {
    line-height: 320px;
  }

main.js

import { createApp } from 'vue'
import './style.css'
import App from './App.vue'
import router from './router'

import ElementPlus from 'element-plus'
import 'element-plus/dist/index.css'

var app = createApp(App)
app.use(router)
app.use(ElementPlus)

app.mount('#app')

问题解决