Element-ui实现左侧二级导航

这里使用的Element文档版本是2.13.1。

路由文件index.js：

import Vue from 'vue'
import Router from 'vue-router'
import Form from '@/components/Form'
import Data from '@/components/Data'
import Radio from '@/components/Radio'
import Checkbox from '@/components/Checkbox'
import Table from '@/components/Table'
import Tag from '@/components/Tag'
import Button from '@/components/Button'
import Tabs from '@/components/Tabs'
import Echarts from '@/components/Echarts'

Vue.use(Router);

let router = new Router({
  mode: 'history',
  routes: [
    {
      path: '/',
      name: 'index',
      redirect: '/form/radio'
    },
    {
      path: '/form',
      name: 'form',
      component: Form,
      meta: {
        title: 'Form',
        icon: 'el-icon-eleme'
      },
      children: [
        {
          path: '/form/radio',
          name: 'radio',
          component: Radio,
          meta: {
            title: 'Radio'
          }
        },
        {
          path: '/form/checkbox',
          name: 'checkbox',
          component: Checkbox,
          meta: {
            title: 'Checkbox'
          }
        }
      ]
    },
    {
      path: '/data',
      name: 'data',
      component: Data,
      meta: {
        title: 'Data',
        icon: 'el-icon-upload'
      },
      children: [
        {
          path: '/data/table',
          name: 'table',
          component: Table,
          meta: {
            title: 'Table'
          }
        },
        {
          path: '/data/tag',
          name: 'tag',
          component: Tag,
          meta: {
            title: 'Tag'
          }
        }
      ]
    },
    {
      path: '/button',
      name: 'button',
      component: Button,
      meta: {
        title: 'Button',
        icon: 'el-icon-s-order'
      }
    },
    {
      path: '/tabs',
      name: 'tabs',
      component: Tabs,
      meta: {
        title: 'Tabs',
        icon: 'el-icon-s-ticket'
      }
    },
    {
      path: '/echarts',
      name: 'echarts',
      component: Echarts,
      meta: {
        title: 'Echarts',
        icon: 'el-icon-s-marketing'
      }
    }
  ]
});

export default router

App.vue：

<template>
  <div id="app">
    <el-container style="height: 100%;">
      <el-header style="height: 80px;">Header</el-header>
      <el-container>
        <el-aside width="210px">
          <el-row class="tac">
            <el-col :span="24">
              <el-menu
                default-active="2"
                class="el-menu-vertical-demo"
                @open="handleOpen"
                @close="handleClose"
              >
                <template v-for="route in this.$router.options.routes">
                  <el-submenu
                    :key="route.path"
                    :index="route.path"
                    v-if="route.children && route.children.length"
                  >
                    <template slot="title">
                      <i :class="route.meta.icon"></i>
                      <span>{{route.meta.title}}</span>
                    </template>
                    <el-menu-item-group>
                      <router-link :to="todo.path" :key="todo.path" v-for="todo in route.children">
                        <el-menu-item
                          :index="todo.path"
                        >{{todo.meta.title}}</el-menu-item>
                      </router-link>
                    </el-menu-item-group>
                  </el-submenu>

                  <router-link
                    :to="route.path"
                    :key="route.path"
                    v-else-if="!route.children && route.path != '/'"
                  >
                    <el-menu-item :index="route.path">
                      <i :class="route.meta.icon"></i>
                      <span>{{route.meta.title}}</span>
                    </el-menu-item>
                  </router-link>
                </template>
              </el-menu>
            </el-col>
          </el-row>
        </el-aside>
        <el-main>
          <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
  </div>
</template>

<script>
export default {
  name: "App",
  components: {},
  methods: {
    handleOpen(key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose(key, keyPath) {
      console.log(key, keyPath);
    }
  }
};
</script>

<style>
#app {
  font-family: "Avenir", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: #2c3e50;
  height: 100%;
}

.el-header,
.el-footer {
  background-color: #b3c0d1;
  color: #333;
  line-height: 80px;
}

.el-aside {
  background-color: #d3dce6;
  color: #333;
}

.el-aside a{
  text-decoration: none;
}

.el-main {
  background-color: #e9eef3;
  color: #333;
}

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>

其中'<el-menu>'中的'<router-link></router-link>'是关键，不然没法导航到相关组件。

Form.vue、Data.vue组件模板中需要添加'<router-view></router-view>'。