P13 VUE 二级menu实现

主要修改以下几个点：

CommonAside.vue中

外层便利有孩子节点，关键词key是对应的标签，class动态图表渲染

内层遍历不能再用item，用subitem，遍历该item.childeren，关键词是path，

<template>
  <div>
    <el-menu
    default-active="1-4-1"
    class="el-menu-vertical-demo"
    @open="handleOpen"
    @close="handleClose"
    :collapse="isCollapse"
    background-color="#545c64"
    text-color="#fff"
    active-text-color="#ffd04b"
    >
      <!-- 无子页 -->
      <el-menu-item v-for="item in noChildren" :key="item.name" :index="item.name">
        <!-- i标签是图标 -->
        <!-- 静态渲染 -->
       <!-- <i :class="el-icon-menu"></i> -->
        <!-- 动态渲染 -->
        <i :class="`el-icon-${item.icon}`"></i>
        <!-- 导航的文字 -->
        <span slot="title">{{item.label}}</span>
      </el-menu-item>

      <!-- 有子页 -->
      <!-- 一级渲染 -->
      <el-submenu v-for="item in hasChildren" :key="item.label" :index="item.label">
        <template slot="title">
          <i :class="`el-icon-${item.icon}`"></i>
          <span slot="title">{{ item.label }}</span>
        </template>
        <!-- 二级渲染 -->
        <el-menu-item-group v-for="subitem in item.children" :key="subitem.path" >
          <el-menu-item :index="subitem.path">{{ subitem.label }}</el-menu-item>
        </el-menu-item-group>
      </el-submenu>
     <!--
      <el-submenu index="1">
        <template slot="title">
          <i class="el-icon-location"></i>
          <span slot="title">导航一</span>
        </template>
        <el-menu-item-group>
          <el-menu-item index="1-1">选项1</el-menu-item>
          <el-menu-item index="1-2">选项2</el-menu-item>
        </el-menu-item-group>
      </el-submenu> -->



    </el-menu>
  </div>
</template>


<style>
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
  }
</style>

<script>
  export default {
    data() {
      return {
        isCollapse: false,
        menuData: [
          {
            path: '/',
            name: 'home',
            label: '首页',
            icon: 's-home',
            url: 'Home/Home'
          },
          {
            path: '/mall',
            name: 'mall',
            label: '商品管理',
            icon: 'video-play', //图标
            url: 'MallManage/MallManage'
          },
          {
            path: '/user',
            name: 'user',
            label: '用户管理',
            icon: 'user',
            url: 'UserManage/UserManage'
          },
          {
            label: '其他',
            icon: 'location',
            children: [{
                path: '/page1',
                name: 'page1',
                label: '页面1',
                icon: 'setting',
                url: 'Other/PageOne'
              },
              {
                path: '/page2',
                name: 'page2',
                label: '页面2',
                icon: 'setting',
                url: 'Other/PageTwo'
              }
            ]
          }
        ]

      };
    },

    methods: {
      handleOpen(key, keyPath) {
        console.log(key, keyPath);
      },
      handleClose(key, keyPath) {
        console.log(key, keyPath);
      }
    },

    computed:{
      //无子菜单
      noChildren() {
        return  this.menuData.filter(item => !item.children)
      },
      //有子菜单
      hasChildren() {
        return this.menuData.filter(item => item.children)
      }
    },
  }
</script>