组件在有的页面显示，有的页面不显示（或者解决组件嵌套太深导致有些东西无法显示问题）

采用keep-alive来显示。在组件中：

例如：<keep-alive>

   导航栏

</keep-alive>

在index。js中：

在不需要显示的组件路由中添加：

meta：{

keepAlive：false；

}

在要显示的组件中写：

meta：{

keepAlive：true；

}

eg：

 

xx.vue

<template>
  <div id="app">
    <!-- 其他页 -->
    <el-container v-if="$route.meta.keepAlive">
      <el-header>
        <keep-alive>
        <!-- 导航栏 -->
          <header-nav></header-nav>
        </keep-alive>
      </el-header>
    <el-container>
      <el-aside width="250px">
        <!-- 侧边栏 -->
        <keep-alive>
          <left></left>
        </keep-alive>
      </el-aside>
      <el-main>
        <!-- Body -->
         <router-view></router-view>
      </el-main>
    </el-container>
    </el-container>
 
    <!-- 登录页 -->
    <router-view v-if="!$route.meta.keepAlive"></router-view>
   </div>
</template>
 
<script>
import header from './components/Header.vue';
import left from './components/Left.vue';
 
export default{
    components: {
        headerNav: header,
        left: left
      }
}
</script>
<style>
</style>

 

 

index.js

import Vue from 'vue'
import Router from 'vue-router'
import HelloWorld from '@/components/HelloWorld'
 
import Login from '@/views/Login'
import index from '@/views/index'
import versionList from '@/views/versionList'
 
Vue.use(Router)
 
export default new Router({
  routes: [
    {
      path: '/',
      name: 'login',
      component: Login,
      meta: {
        keepAlive: false
      }
    },
    {
      path: '/index',
      name: 'index',
      component: index,
      meta: {
        keepAlive: true
      }
    },
    {
      path: '/versionList',
      name: 'versionList',
      component: versionList,
      meta: {
        keepAlive: true
      }
    },
  ]
})