请老师帮我看看哪里出问题了 点击导航栏 地址发生变化了，但是没有内容。。

导航栏代码

<template>

<div class="sidebar">

<el-menu class="el-menu-vertical-demo" :collapse="isCollapse" background-color="rgb(50, 65, 87)" text-color="rgb(191, 203, 217)" :default-active="$router.path" router>

<el-submenu index="1">

<template slot="title">

<i class="el-icon-location"></i>

<span slot="title">系统管理</span>

</template>

<el-menu-item index="/systemFunction">系统功能</el-menu-item>

<el-menu-item index="1-2">选项2</el-menu-item>

<el-menu-item index="1-3">选项3</el-menu-item>

<el-submenu index="1-4">

<span slot="title">选项4</span>

<el-menu-item index="1-4-1">选项1</el-menu-item>

</el-submenu>

</el-submenu>

<el-menu-item index="2">

<i class="el-icon-menu"></i>

<span slot="title">导航二</span>

</el-menu-item>

<el-menu-item index="3" disabled>

<i class="el-icon-document"></i>

<span slot="title">导航三</span>

</el-menu-item>

<el-menu-item index="4">

<i class="el-icon-setting"></i>

<span slot="title">导航四</span>

</el-menu-item>

</el-menu>

</div>

</template>

<style>

.el-menu-vertical-demo:not(.el-menu--collapse) {

width: 200px;

min-height: 400px;

}

</style>

<script>

export default {

data() {

return {

isCollapse: true

};

},

methods: {

},

mounted() {

// 通过bus进行组件之间的的传值，折叠侧边栏

this.bus.$on('collapse',msg => {

this.isCollapse=msg

})

}

}

</script>

<style>

.sidebar {

display: block;

position: absolute;

left: 0;

top: 70px;

bottom: 0;

overflow-y: scroll;

}

.el-submenu__title i {

color: #fff;

margin-right: 5px;

}

.el-menu-item i{

color: #fff;

margin-right: 10px;

}

.sidebar::-webkit-scrollbar {

width: 0;

}

.sidebar-el-menu:not(.el-menu--collapse) {

width: 200px;

}

.el-menu-vertical-demo:not(.el-menu--collapse) {

width: 200px;

min-height: 400px;

}

.sidebar > ul {

height: 100%;

}

</style>

路由代码

import Vue from 'vue'

import Router from 'vue-router'

Vue.use(Router)

export default new Router({

routes: [

{

path: '/',

component: resolve => require(['@/components/Home'], resolve),

meta: {  },

children:[

{

path:'/systemFunction',

component: resolve => require(['@/pages/systemFunction/index.vue'], resolve),

meta: { title: '系统功能' }

}

]

}

]

})

文件地址