有的时候我真的想钻到电脑里面去

然后一刀戳死 bug
关于 elementUI+vue 导航栏跳不到对应的路由，求救

<template>

  <el-container style="height: 500px; border: 1px solid #eee">
  
    <el-aside width="200px" style="background-color: rgb(238, 241, 246)">
      <el-menu class="el-menu-vertical-demo"
               :default-active="defaultActive"
               router>
        <el-submenu :index="college.collegeId"
                    v-for="college in show.college">
          <template slot="title">
            <i class="el-icon-location"></i>
            <span>{{college.collegeName}}</span>
          </template>
            <el-menu-item :index="professional.professionalId"
                          v-for="professional in college.professionalList">
              {{professional.professionalName}}
            </el-menu-item>
        </el-submenu>
      </el-menu>
    </el-aside>
    
    
    <el-container>
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
    
    
  </el-container>
</template>

<script>
  export default {
    name: "aside1",
    data() {
     略
    },
    computed: {
      defaultActive: function(){
        return this.$route.path.replace('/', '');
      }
    },
  }
</script>

这是 router 的

import Vue from 'vue'
import Router from 'vue-router'
Vue.use(Router)
const collegePage = r => require.ensure([], () => r(require('@/page/collegePage')), 'collegePage');
const routes = [
  {
    path: '/',
    children:[
      {
        path: '/:id',
        component: collegePage
      }
    ]
  },{
    path:'/:id',
    component:collegePage
  }
]
export default new Router({
  mode:'history',
  routes,
  strict: process.env.NODE_ENV !== 'production',
})

数据都可以显示，url 地址也的确变成了 http://localhost:8080/0201
但是主题就是显示不出来