How to solve the problem of # tree structure #?

recursive processing tree structure

```javascript
data: [{
          label: '一级 1',
          TypeID: "1",
            Children:{
              ModelTreeItem:[{
                label: '二级 1-1',
                TypeID: "2",
                Children:{
                  ModelTreeItem:[{
                    label: '二级 1-2',
                    TypeID: "3",
                  }]
                } 
              }]
            } 
        }, {
          label: '一级 2',
          TypeID: "4",
          Children:{
            ModelTreeItem:[{
              label: '二级 2-1',
              TypeID: "5",
            }, {
              label: '二级 2-2',
              TypeID: "6",
            }]
          }
        }, {
          label: '一级 3',
          TypeID: "7",
          Children:{
            ModelTreeItem:[{
              label: '二级 2-1',
              TypeID: "8",
            }, {
              label: '二级 2-2',
              TypeID: "9",
            }]
          }
        }],