const routes=[
 {path:'/login',component:login},/*登录*/
 
 {path:'/home',component:home},/*首页*/
 {path:'/monitor',component:monitor},/*实时监控*/
 {path: "/orderQuery", component: orderQuery},/*电子围栏*/
 {path: "/fenceSet", component: fenceSet},/*电子围栏*/
 
 {path:'/orderCenter',component:orderCenter},/*订单中心*/
 {path:'/carctlExamine',component:carctlExamine},/*车管员审批*/
 {path:'/partExamine',component:partExamine},/*部门领导审批*/
 {path:'/vpExamine',component:vpExamine},/*副总审批*/
 
 {path:'/distribute',component:distribute},/*调度派单*/
 {path:'/receipt',component:receipt},/*回执*/
 
 {path:'/trajectory',component:trajectory},/*轨迹回放*/
 {path:'/statistics',component:statistics },/*统计*/
 
 {path:'/car',component:car},/*车辆管理*/
 {path:'/user',component:user},/*用户管理*/
 {path:'/equipment',component:equipment},/*设备管理*/
 {path:'/group',component:group},/*小组维护*/
 {path:'/driver',component:driver},/*驾驶员管理*/
 
 {path: '/company', component: company},/*公司管理*/
 {path: '/adminManage', component: adminManage},/*公司员管理*/
 {path: '/roleManage', component: roleManage},/*角色管理*/
 {path:'/systemDaily',component:systemDaily },/*系统日志*/
 
 
 
];

 <el-menu
  :default-active="$route.path"
  class="el-menu-demo"
  mode="horizontal"
  @select="handleSelect"
  background-color="#545c64"
  text-color="#fff"
  active-text-color="#85ffca">
 
  <el-menu-item :index="item.path" v-for="item in pathList"
      v-if="item.path!=null" :key="item.id" >
  <router-link :to="item.path">{{item.name}}</router-link>
  </el-menu-item>/*一级导航*/
 
  <el-submenu v-if="item.path==null" :key="item.id":index="item.name" v-for="item in pathList">
  <template slot="title">{{item.name}}</template>
 
  <el-menu-item v-for="child in item.children" :index="child.path"
   :key="child.id" v-if="child.path!=null" >/*二级导航*/
   <router-link :to="child.path">{{child.name}}</router-link>
 
  </el-menu-item>
  <el-submenu v-if="child.children!=[]&&child.path==null" v-for="child in item.children":key="child.id":index="child.name" >
   <template slot="title">{{child.name}}</template>
   <el-menu-item v-for="three in child.children":index="three.path":key="three.id">/*若存在三级导航*/
   <router-link :to="three.path">{{three.name}}</router-link>
   </el-menu-item>
  </el-submenu>
 
  </el-submenu>
 
 </el-menu>