后台给的树形数据：

{
    "code": 200,
    "data": [
        {
            "code": "jsd",
            "children": [
                {
                    "code": "hx",
                    "children": [],
                    "name": "航向",
                    "id": 8,
                    "libTableId": 149,
                    "parentId": 1
                },
                {
                    "code": "cx",
                    "children": [],
                    "name": "垂向",
                    "id": 9,
                    "libTableId": 149,
                    "parentId": 1
                },
                {
                    "code": "fx",
                    "children": [],
                    "name": "法向",
                    "id": 10,
                    "libTableId": 149,
                    "parentId": 1
                }
            ],
            "name": "加速度",
            "id": 1,
            "libTableId": 149,
            "parentId": 0
        },
        {
            "code": "cg",
            "children": [],
            "name": "磁感",
            "id": 2,
            "libTableId": 149,
            "parentId": 0
        },
        {
            "code": "dy",
            "children": [],
            "name": "电压",
            "id": 3,
            "libTableId": 149,
            "parentId": 0
        },
        {
            "code": "yw",
            "children": [],
            "name": "液位",
            "id": 4,
            "libTableId": 149,
            "parentId": 0
        },
        {
            "code": "zt",
            "children": [],
            "name": "状态",
            "id": 5,
            "libTableId": 149,
            "parentId": 0
        },
        {
            "code": "wd",
            "children": [],
            "name": "温度",
            "id": 6,
            "libTableId": 149,
            "parentId": 0
        },
        {
            "code": "yb",
            "children": [
                {
                    "code": "yh",
                    "children": [],
                    "name": "圆弧",
                    "id": 11,
                    "libTableId": 149,
                    "parentId": 7
                },
                {
                    "code": "zx",
                    "children": [],
                    "name": "直线",
                    "id": 12,
                    "libTableId": 149,
                    "parentId": 7
                },
                {
                    "code": "jg",
                    "children": [],
                    "name": "结构",
                    "id": 13,
                    "libTableId": 149,
                    "parentId": 7
                }
            ],
            "name": "应变",
            "id": 7,
            "libTableId": 149,
            "parentId": 0
        }
    ],
    "ext": {}
}

 HTML部分：

      <div class="selectTree-class">
        <div>{{ types.title }} :</div>
        <a-tree-select
          :dropdownStyle="{maxHeight:'300px'}"
          multiple  //是否多选
          placeholder="请选择"
          v-model="typeTreeTitle"  //选中菜单回填的值
          :replaceFields="replaceTypeTreeFields"  //替换treenode字段为后台数据对应的值
          :treeData="typeTreeData"  //后台数据 用来渲染菜单
          :selectedKeys='selectedTypeTreeKeys' //设置选中的树节点
          @select="handleSelectChange" //被选中时调用
        >
        </a-tree-select>
      </div>

data部分：

      typeTreeData: [],
      selectedTypeTreeKeys:[],
      typeTreeTitle:undefined,
      replaceTypeTreeFields: { //替换 treenode字段为treedata
        children: 'children',
        title: 'name',
        value: 'id',
        key: 'id',
      },

JS代码

    handleSelectChange(selectedKeys, event) {
      this.selectedTypeTreeKeys = selectedKeys;
      this.typeTreeTitleVal = event.$options.propsData.dataRef.name;//每个项目不一样
      this.typeTreeTitle  = this.typeTreeTitleVal; //设置选中的值回显到页面选项中
    },

    //从后台获取树形数据,并调用递归处理
    getTypeTreeData(){
      let params = {
        libTableId: this.selectedTreeRow.id,
      };
      getAction(this.url.typeTreeUrl, params).then((res) => {
        if (res.code === 200) {
          this.selectTableFlag = 'typeTree';
          this.typeTreeData = this.recursive(res.data); //这个函数只用看这行代码就行
        }
      });
    },
    //递归处理树形数据
    recursive(arr) {
      // 递归给数组的每一项增加scopedSlots: { title: 'customTitle',},
      return arr.map((item) => {
        return {
          ...item,
          children: item.children && item.children.length ? this.recursive(item.children) : [],
          selectable: (this.selectTableFlag == 'typeTree') ? true :item.parentId != 0, //这块selectable属性主要是判断一二级菜单的隐藏，代码翻译过来：如果是我当前这个树为true,一二级菜单都显示，否则一级不显示，只显示二级。 这块后台数据中我们是用parentId来区分的
          slots: { icon: item.parentId == 0 ? 'praent' : 'child' },
          scopedSlots: {},
        };
      });
    },

有不懂的欢迎留言！~~~~~~~