效果：

引用CSS、JS：

Vue、element-ui、Axios

treeTable: https://github.com/ProsperLee/element-tree-grid

模擬根據父id請求子數據的JSON：

 1 // data.json
 2 [{
 3     "id": "a1",
 4     "name": "一級-1",
 5     "parentId": "000"
 6 }]
 7 
 8 // node.json
 9 [{
10     "id": "123",
11     "name": "二級-1-1",
12     "parentId": "a1"
13
 
 }, {
14     "id": "123",
15     "name": "二級-1-2",
16     "parentId": "a1"
17 }, {
18     "id": "123",
19     "name": "二級-1-3",
20     "parentId": "a1"
21 }]

HTML部分：

1     <div id="app">
2         <el-table :data="data">
3             <el-table-column type="index" label
 
="#"></el-table-column>
4             <el-table-tree-column :remote="remote" prop="name" parent-key="parentId" label="NAME"></el-table-tree-column>
5             <el-table-column prop="name" label="NAME"></el-table-column>
6         </el-table>
7     </div>
 

JS部分：// 註意屬性表格要顯示展開箭頭需要加入 child_num 屬性

 1         new Vue({
 2             el: "#app",
 3             data: {
 4                 data: []
 5             },
 6             methods: {
 7                 remote(row, callback) {
 8                     var that = this;
 9                     axios.get("./json/node.json", null)
10                         .then(function (response) {
11                             row.child_num = response.data.length; // 父級有幾個孩子
12                             var count = row.depth+1;
13                             response.data.forEach((element)=>{ // 循環孩子
14                                 // element.child_num = 1;
15                                 element.depth = count; 
16                             })
17                             var len = response.data.length;
18                             for(var i = 0; i < len; i++){
19                                 if(response.data[i].parentId == row.id){
20                                     response.data.unshift(0,0); // 數組前面添加元素
21                                     Array.prototype.splice.apply(that.data, response.data); // 指定位置拼接兩個數組
22                                     break;
23                                 }
24                             }                         
25                             callback(that.data.filter(f => f[‘parentId‘] == row[‘id‘]))
26                         })
27                         .catch(function (error) {
28                             console.log(error);
29                         })
30                 },
31                 // 獲取根節點
32                 getParentIdData(){
33                     var that = this;
34                     axios.get("./json/data.json", null)
35                         .then(function (response) {
36                             response.data.forEach(element => {
37                                 element.child_num = 1; 
38                                 element.depth = 0;
39                             });
40                             that.data = response.data;
41                         })
42                         .catch(function (error) {
43                             console.log(error);
44                         })
45                 }
46             },
47             created() {
48                 this.getParentIdData();
49             },
50         })

基於element-tree-table樹型表格點擊節點請求數據展開樹型表格