keep-alive不能缓存多层级路由菜单问题解决

const _import = require('@/router/_import_prodection');//获取组件的方法
import {tree} from '@/utils/treeDate'
import Layout from '@/views/layout'
import EmptyTemplate from '@/views/layout/EmptyTemplate'

export function filterAsyncRouter(routerlist) {
  const routerlists=tree(routerlist )
  //获取路由信息
  function getRouter(routerlists){
    routerlists.forEach(e => {
    // 删除无用属性
    delete e.catalogCode
    delete e.catalogOrder
    delete e.endpoints
    delete e.fullOrder
    
    // delete e.permName
    // delete e.id
    // delete e.parentId
    e.name=e.catalogName
    
    if (e.parentId === 0||e.children) {//Layout组件特殊处理
      //路径为空时会因为undefind报错，给个默认值来解决
      e.path = e.url||'nopath'
      if(e.url.split('/').length>2){
      //处理多层级路的时候给了一个空模板
        e.component = EmptyTemplate
      }else{
        e.component = Layout
      }
      e.icon='setting-fill'
      
    } else {
      e.icon='circle'
      e.component = _import(e.url)
      //路径为空时会因为undefind报错，给个默认值来解决
      e.path = e.url.split('/')[2]||'nopath'
    }
    // delete e.parentId
    delete e.url
    // if (e.redirect === '') {
    //  delete e.redirect
    // }
    
    if (e.icon !== '' && e.title !== '') { // 配置 菜单标题 与 图标
      e.meta = {
        // title: e.catalogName 中文名称
         // catalogEngName 英文名称
        title: e.catalogEngName,
        titleZh:e.catalogName,
        icon: e.icon
      }
    }
    delete e.catalogName
    delete e.icon
    delete e.title
    // delete e.name//由于名字的存在导致named 错误 删掉
    if (e.children != null) {
      // 存在子路由就递归
      getRouter(e.children)
    }
    })
    return routerlists
  }
  const getRouters=getRouter(routerlists)
    // return asyncRouterMap
    
  return getRouters
}

<template>
<div>
  <app-main/>
</div>
</template>
<script>
import { AppMain} from './components'
export default {
  name:'EmptyTemplate',
  components:{AppMain}
  
}
</script>

const state = {
 visitedViews: [],
 cachedViews: ['EmptyTemplate']
}