<el-menu :default-active="$route.path" router  mode="horizontal">

		<el-menu-item v-for="route in routes" :key="route.path" :index="route.path" :class="$route.path==route.path?'is-active':''">{{route.name}}</el-menu-item>

   </el-menu>

js:

routes: [

	{ path: '/main/kdgadmin', name: '幼儿园管理', },

	{ path: '/main/phyex', name: '体测', },

	]

css:

.is-active{

		background: #a3212f;

		border-bottom: 0px solid transparent;

		color: #FFFFFF;

	}