Vue自定义部分页面显示导航栏功能

<template>
  <div>
    <el-menu :default-active="activeIndex" class="el-menu-demo" mode="horizontal">
      <el-menu-item index="1">
        <router-link to="/homepage">
          <span>首页</span>
        </router-link>
      </el-menu-item>
      <el-menu-item index="2">
        <router-link to="/composevideo">
          <span>合成视频</span>
        </router-link>
      </el-menu-item>
      <el-menu-item index="3" disabled>
        <router-link to="/">
          <span>视频圈</span>
        </router-link>
      </el-menu-item>
      <el-menu-item index="4">
        <router-link to="/useguide">
          <span>使用指南</span>
        </router-link>
      </el-menu-item>
      <el-menu-item index="5">
        <router-link to="/personalcenter">
          <span>个人中心</span>
        </router-link>
      </el-menu-item>
    </el-menu>
  </div>
</template>

<script>
export default {
  name: "Header"
}
</script>

<style scoped>
/*由a来控制router-link*/
a {
  text-decoration: none;
  color: #000000;
  font-family: sans-serif;
  font-size: 14px;
}
</style>

<template>
  <div id="app">
    <div v-if="$route.meta.keepAlive">
      <header-nav></header-nav>
      <router-view></router-view>
    </div>
    <div v-if="!$route.meta.keepAlive">
      <router-view></router-view>
    </div>
  </div>
</template>

<script>
import header from '@/views/Header';
export default{
  components: {
    headerNav: header,
  }
}
</script>

const routes = [
  {
    path: '/',
    name: 'Login',
    component: Login,
    meta:{
      keepAlive: false
    }
  },
  {
    path: '/register',
    name: 'Register',
    component: Register,
    meta:{
      keepAlive: false
    }
  },
  {
    path: '/homepage',
    name: 'Homepage',
    component: Homepage,
    meta:{
      keepAlive: true
    }
  }
]