Vue 菜单栏点击切换单个class(高亮)的方法

<ul>
   <li v-for="(item,index) in goods" class="menu-item" @click="toggle(index);scrollToFoods(index)"
   :class="{'active':index ==checkindex }">
   </li>
  </ul>

export default {
 data () {
  return {
  checkindex: 0 // 初始化第一个栏块高亮
  }
 },
 methods: {
  toggle (index) {
  this.checkindex = index
  }

 .active {
 background: white;
 }

<template>
 <el-menu
 :default-active="$route.path"
 background-color="#383838"
 text-color="#ccc"
 active-text-color="#fff000" router>
 <el-menu-item index="/dashboard">
  <span slot="title">总览</span>
 </el-menu-item>
 <el-submenu index="2">
  <template slot="title">导航1</template>
  <el-menu-item index="/nav1/index">导航11</el-menu-item>
  <el-submenu index="2-2">
  <template slot="title">导航12</template>
  <el-menu-item index="/nav2/nav1">导航121</el-menu-item>
  <el-menu-item index="/nav2/nav2">导航122</el-menu-item>
  </el-submenu>
 </el-submenu>
 </el-menu>
</template>

:default-active="$route.path"

router>

<el-menu-item index="/dashboard">