Vue3+Element-Plus 实现点击左侧菜单时显示不同内容组件展示在Main区域功能

import { createRouter, createWebHashHistory } from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'
const routes = [
  {
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
    path: '/home',
    component: Home,
    redirect: '/welcome',
    children: [
      { path: '/welcome', component: Welcome },
      { path: '/users', component: Users }
    ]
  }
]
 
const router = createRouter({
  history: createWebHashHistory(),
  routes
})
 
// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  if (to.path === '/login') return next()
  // 获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  next()
})
 
export default router

<template>
  <el-container class="home_container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img class="lazy" data-src="../assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu active-text-color="#409Eff"
        background-color="#545c64"
        text-color="#fff" unique-opened
        :collapse="isCollapse" :collapse-transition="false"
        :router="true">
        <!-- 一级菜单 -->
        <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
          <!-- 一级菜单模板区域 -->
          <template #title>
            <el-icon :class="iconsObj[item.id]"></el-icon>
            <span>{{item.authName}}</span>
          </template>
          <!-- 二级菜单 -->
          <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id">
          <template #title>
            <el-icon><iconMenu /></el-icon>
            <span>{{subItem.authName}}</span>
          </template>
          </el-menu-item>
        </el-submenu>
      </el-menu>
      </el-aside>
      <!-- 右侧内容主体区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>
<script>
export default {
  data () {
    return {
      // 左侧菜单数据对象
      menulist: [],
      // 字体图标对象
      iconsObj: {
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false
    }
  },
  created () {
    this.getMenuList()
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单数据
    async  getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      // 成功了，进行赋值
      this.menulist = res.data
      console.log(res)
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    }
  }
}
</script>
<style lang="less" scoped>
.home_container {
  height: 100%;
}
.el-header {
  background-color: #363d40;
  // 给头部设置一下弹性布局
  display: flex;
  // 让它贴标左右对齐
  justify-content: space-between;
  // 清空图片左侧padding
  padding-left: 0;
  // 按钮居中
  align-items: center;
  // 文本颜色
  color: #fff;
  // 设置文本字体大小
  font-size: 20px;
  // 嵌套
  > div {
    // 弹性布局
    display: flex;
    // 纵向上居中对齐
    align-items: center;
    // 给文本和图片添加间距，使用类选择器
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #313743;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #e9edf1;
}
.iconfont{
  margin-right: 10px;
}
.toggle-button{
 // 添加背景颜色
 background-color: #4A5064;
 // 设置文本大小
 font-size:10px;
 // 设置文本行高
 line-height:24px;
 // 设置文本颜色
 color:#fff;
 // 设置文本居中
 text-align: center;
 // 设置文本间距
 letter-spacing: 0.2em;
 // 设置鼠标悬浮变小手效果
 cursor:pointer;
}
</style>

<template>
  <div>
    <h3>用户列表组件</h3>
  </div>
</template>
 
<script>
export default {
 
}
</script>
 
<style lang="less" scoped>
 
</style>