var data = [{
        "id": "1",
        "data": {
          "menuName": "项目管理",
          "menuCode": "",
        },
        "childTreeNode": [{
          "data": {
            "menuName": "项目",
            "menuCode": "BusProject",
          },
          "childTreeNode": []
        }, {
          "data": {
            "menuName": "我的任务",
            "menuCode": "BusProject",
          },
          "childTreeNode": []
        }, {
          "data": {
            "menuName": "人员周报",
            "menuCode": "BusProject",
          },
          "childTreeNode": []
        }]
      }, {
        "id": "2",
        "data": {
          "menuName": "数据统计",
          "menuCode": "BusClock",
        },
        "childTreeNode": []
      }, {
        "id": "3",
        "data": {
          "menuName": "人事管理",
          "menuCode": "",
        },
        "childTreeNode": []
      }, {
        "id": "4",
        "data": {
          "menuName": "基础管理",
          "menuCode": "",
        },
        "childTreeNode": []
      }]

<li>
  <div @click='toggle'>
　　
     <i v-if='isFolder' class="fa " :class="[open?'fa-folder-open':'fa-folder']"></i>
　　　　　<!--isFolder判断是否存在子级改变图标-->
     <i v-if='!isFolder' class="fa fa-file-text"></i> {{model.data.menuName}}
   </div>
   <ul v-show="open" v-if='isFolder'>
     <items v-for='cel in model.childTreeNode' :model='cel'></items>
   </ul>
 </li>

export default {
  name: 'items',
  props: ['model'],
  components: {},
}

data() {
    return {
       open: false,
       isFolder: true
    }
}

computed: {
  isFolder() {
    return this.model.childTreeNode && this.model.childTreeNode.length
  }
}    

methods: {
　　toggle: function() {
   if(this.isFolder) {
     this.open = !this.open
   }
　　}
}

<template>
  <li>
    <div @click='toggle'>
      <i v-if='isFolder' class="fa " :class="[open?'fa-folder-open':'fa-folder']"></i>
      <!--isFolder判断是否存在子级改变图标-->
      <i v-if='!isFolder' class="fa fa-file-text"></i> {{model.data.menuName}}
    </div>
    <ul v-show="open" v-if='isFolder'>
      <items v-for='cel in model.childTreeNode' :model='cel'></items>
    </ul>
  </li>
</template>
<script type="text/javascript">
  export default {
    name: 'items',
    props: ['model'],
    components: {},
    data() {
      return {
        open: false,
        isFolder: true
      }
    },
    computed: {
      isFolder: function() {
        return this.model.childTreeNode && this.model.childTreeNode.length
      }
    },
    methods: {
      toggle: function() {
        if(this.isFolder) {
          this.open = !this.open
        }
      },
    }
  }
</script>