vue-element-admin一个基于 vue2.0 和 Eelement 的控制面板 UI 框架，这是使用vue技术栈开发的前端程序员的首选管理系统模板，模板以及非常的成熟了，并且有相关的社区和维护人员，开发时候遇到问题也不要慌。

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Github 地址：https://github.com/PanJiaChen/vue-element-admin
Demo体验：https://panjiachen.github.io/vue-element-admin/#/dashboard
官方文档：https://panjiachen.github.io/vue-element-admin-site/zh/

今天就来说一下，怎么使用Tree Table 树形表格。废话不多说，首先看一下官方文档吧，看看官方文档是怎么给到的例子吧：
组件：https://element.eleme.cn/#/zh-CN/component/tree

分别通过default-expanded-keys和default-checked-keys设置默认展开和默认选中的节点。需要注意的是，此时必须设置node-key，其值为节点数据中的一个字段名，该字段在整棵树中是唯一的。

静态
在文档上选一颗自己想要的树的demo

<template>
  <div class="grid-content bg-purple">
    <el-tree
      :data="data"
      show-checkbox
      node-key="id"
      :default-expanded-keys="[2, 3]"
      :default-checked-keys="[5]"
    >
    </el-tree>
  </div>
</template>
<script>
export default {
  data() {
    return {
      data: [
        {
          id: 1,
          label: "一级 2",
          children: [
            {
              id: 3,
              label: "二级 2-1",
              children: [
                {
                  id: 4,
                  label: "三级 3-1-1",
                },
                {
                  id: 5,
                  label: "三级 3-1-2",
                  disabled: true,
                },
              ],
            },
            {
              id: 2,
              label: "二级 2-2",
              disabled: true,
              children: [
                {
                  id: 6,
                  label: "三级 3-2-1",
                },
                {
                  id: 7,
                  label: "三级 3-2-2",
                  disabled: true,
                },
              ],
            },
          ],
        },
      ],
      defaultProps: {
        children: "children",
        label: "label",
      },
    };
  },
};
</script>

效果是这个样子的

在实际应用之中，需要从后端请求过来json数据，然后再对json数据进行一些处理，渲染在界面。
我这里有一些json数据，但是并不是我想要的格式，并不是以上代码中的格式，需要做一些处理，对json的格式的转化。

json数据

{
    "msg": "success",
    "code": 1,
    "data": [{
        "id": 1,
        "organName": "住部门",
        "parentId": null,
        "manager": "zs",
        "phone": null,
        "companyId": 1,
        "address": null
    }, {
        "id": 19,
        "organName": "uiui",
        "parentId": 1,
        "manager": "iuui",
        "phone": "ui",
        "companyId": 1,
        "address": null
    }, {
        "id": 20,
        "organName": "3223",
        "parentId": 19,
        "manager": "32",
        "phone": "3232",
        "companyId": 1,
        "address": null
    },  {
        "id": 22,
        "organName": "测试部",
        "parentId": 1,
        "manager": "李云泥",
        "phone": "18117166505",
        "companyId": 1,
        "address": null
    }, {
        "id": 23,
        "organName": "123",
        "parentId": 19,
        "manager": "1",
        "phone": "12",
        "companyId": 1,
        "address": null
    }, {
        "id": 24,
        "organName": "www",
        "parentId": 19,
        "manager": "",
        "phone": "",
        "companyId": 1,
        "address": null
    }]
}

动态demo如下：

<template>
  <div class="grid-content bg-purple">
    <el-tree
      :data="treeData"
      show-checkbox
      default-expand-all
      node-key="id"
      ref="tree"
      highlight-current
      :props="defaultProps"
     
    >
    </el-tree>
  </div>
</template>
<script>
//调用接口
import { getQuerycheckList } from "@/api/data/organ";
export default {
  data() {
    return {
      setTree: [],
      defaultProps: {
        children: "children",
        label: "organName",
      },

      treeData: [],
      organList: [],
    };
  },

  created() {
    //加载部门管理节点接口定义
    this.getQuerycheckList();
  },

  methods: {
    //部门管理节点接口定义
    getQuerycheckList() {
      const params = {};
      this.dataLoading = true;
      getQuerycheckList(params).then((res) => {
        this.setTree = res.data;
        this.organList = res.data.map((a) => ({
          label: a.organName,
          value: a.id,
        }));
        //debugger;
        this.getListData();
        this.dataLoading = false;
      });
    },

    //对json的格式的转化
    getListData() {
      let dataArray = [];
      this.setTree.forEach(function (data) {
        //  debugger;
        let parentId = data.parentId;
        if (parentId === null) {
          let objTemp = {
            id: data.id,
            organName: data.organName,
            manager: data.manager,
            phone: data.manager,
            parentId: parentId,
          };
          dataArray.push(objTemp);
        }
      });
      this.treeData = this.data2treeDG(this.setTree, dataArray);
    },
    data2treeDG(datas, dataArray) {
      for (let j = 0; j < dataArray.length; j++) {
        let dataArrayIndex = dataArray[j];
        let childrenArray = [];
        let Id = dataArrayIndex.id;
        for (let i = 0; i < datas.length; i++) {
          let data = datas[i];
          let parentId = data.parentId;
          if (parentId == Id) {
            //判断是否为儿子节点
            let objTemp = {
              id: data.id,
              organName: data.organName,
              manager: data.manager,
              phone: data.phone,
              parentId: parentId,
            };
            childrenArray.push(objTemp);
          }
        }
        dataArrayIndex.children = childrenArray;
        if (childrenArray.length > 0) {
          this.data2treeDG(datas, childrenArray);
        }
      }
      return dataArray;
    },
  },
};
</script>