element 中 el-menu 组件的无限极循环思路代码详解

实现思路主要组件嵌套（组件自己调用自己）

　　下面是组件所需要的数据

{
 "code": 1,
 "data": {
  "menuVoList": [
   {
    "childList": [
     {
      "childList": [],
      "menu": {
       "createBy": "0-1",
       "createTime": 1587610158,
       "id": "2f006aed6a114579bd8b9809724428f7",
       "name": "系统用户权限管理",
       "parentId": "6d68079a16b94292990f612237bd048e",
       "path": "/userallotrole",
       "updateBy": "0-1",
       "updateTime": 1587610221
      }
     },
     {
      "childList": [],
      "menu": {
       "createBy": "0-1",
       "createTime": 1587605059,
       "id": "c948265cdf27420eb7b6b502292c5990",
       "name": "系统用户管理",
       "parentId": "6d68079a16b94292990f612237bd048e",
       "path": "/user",
       "updateBy": "0-1",
       "updateTime": 1587610230
      }
     }
    ],
    "menu": {
     "createBy": "0-1",
     "createTime": 1587605025,
     "id": "6d68079a16b94292990f612237bd048e",
     "name": "用户管理",
     "parentId": "",
     "path": "/#",
     "updateBy": "0-1",
     "updateTime": 1587610117
    }
   },
   {
    "childList": [
     {
      "childList": [],
      "menu": {
       "createBy": "0-1",
       "createTime": 1587469457,
       "id": "d4b70897052742bb860cf14cea8cf131",
       "name": "新建/修改菜单",
       "parentId": "82e5ca1ab2e04d8faffeb973286771ec",
       "path": "/newMenu",
       "updateBy": "0-1",
       "updateTime": 1587469457
      }
     }
    ],
    "menu": {
     "createBy": "0-1",
     "createTime": 1587469385,
     "id": "82e5ca1ab2e04d8faffeb973286771ec",
     "name": "菜单管理",
     "parentId": "",
     "path": "",
     "updateBy": "0-1",
     "updateTime": 1587469426
    }
   },
   {
    "childList": [
     {
      "childList": [],
      "menu": {
       "createBy": "0-1",
       "createTime": 1587468494,
       "id": "3a092edd120d40b79322d8486e53e5a1",
       "name": "系统角色管理",
       "parentId": "ce5704f647d341fe8334ad12c6dd4a6b",
       "path": "/setrole",
       "updateBy": "0-1",
       "updateTime": 1587469340
      }
     },
     {
      "childList": [],
      "menu": {
       "createBy": "0-1",
       "createTime": 1587469360,
       "id": "61d0e4fecbed407d89b1ea5878072374",
       "name": "设置角色权限",
       "parentId": "ce5704f647d341fe8334ad12c6dd4a6b",
       "path": "/authorization",
       "updateBy": "0-1",
       "updateTime": 1587469360
      }
     },
     {
      "childList": [],
      "menu": {
       "createBy": "0-1",
       "createTime": 1587469520,
       "id": "a1a2f6bcbfba4a7f9178ef03ea0fe5b0",
       "name": "权限管理",
       "parentId": "ce5704f647d341fe8334ad12c6dd4a6b",
       "path": "/resource",
       "updateBy": "0-1",
       "updateTime": 1587624251
      }
     }
    ],
    "menu": {
     "createBy": "0-1",
     "createTime": 1587468417,
     "id": "ce5704f647d341fe8334ad12c6dd4a6b",
     "name": "角色管理",
     "parentId": "",
     "path": "",
     "updateBy": "0-1",
     "updateTime": 1587468417
    }
   }
  ]
 },
 "message": "成功"
}

　现在我们来设置组件 （在 componet 文件夹里面建一个 menu.vue） 代码如下

<template>
 <div>
  <template v-for="value in menuData">
   <el-submenu v-if="value.childList.length > '0'" :index="value.menu.name"> //判断传进来的数据中 childList 数组length 是否大于零， 如果大于零表示 不是不需要在循环下去了
    <template slot="title">
     <i class="el-icon-s-tools" />
     <span slot="title">{{ value.menu.name }}</span>
    </template>
    <MenuTree :menu-data="value.childList" />
   </el-submenu>
   <el-menu-item v-else :index="value.menu.path">
    <span slot="title">{{ value.menu.name }}</span>
   </el-menu-item>
  </template>
 </div>
</template>
<script>
export default {
 name: 'MenuTree',
 props: ['menuData']
}
</script>
<style lang="scss" >
.el-submenu__title i {
 color: #fff;
}
.el-menu--collapse {
 width: 54px;
}
</style>

　　接下来 在需要使用 menu 组件的地方引入刚才定义的组件

<template>
   <el-menu
    class="el-menu-vertical-demo"
    :collapse="isCollapse"
    background-color="#4A5A74"
    active-text-color="#ffd04b"
    text-color="#fff"
    :unique-opened="true"
    :default-active="this.$route.path"
    @select="handleSelect"
   >
    <menuTree :menu-data="list" />
   </el-menu>
</template>

import menuTree from '@/component/menu'
export default{
 components: {
  menuTree
 },
data: {
  list: []
},
methods: {
   getMenuList({}).then(res => { //我这里是请求后台得来得数据，没有数据直接用我上面得数据，不过得像我下面这样处理
    if (res.status === 200) {
     this.list = res.data.data.menuVoList
    }
   })
}
}

　这样，em-menu 组件的无限极循环便实现了，注意，我 上面代码中 el-menu 的属性可能多了一些，请根据自己需要删除

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