js 树形结构 通过子找到父 tree 查找数据 拼接成 A-AA-AAA-AAAA

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以下结构，通过41查找，拼接成11-21-31-41 

const data = [{
                id: 11,
                pid: 'a1',
                text: 11,
                children: [{
                        id: 21,
                        pid: 'b1',
                        text: 21,
                        children: [{
                                id: 31,
                                pid: 'c1',
                                text: 31,
                                children: [{
                                        id: 41,
                                        pid: 'd1',
                                        text: 41,
                                        children: []
                                    },
                                    {
                                        id: 42,
                                        pid: 'd2',
                                        text: 42,
                                        children: []
                                    }
                                ]
                            },
                            {
                                id: 32,
                                pid: 'c2',
                                text: 32,
                                children: []
                            }
                        ]
                    },
                    {
                        id: 22,
                        pid: 'b2',
                        text: 22,
                        children: []
                    }
                ]
            },
            {
                id: 12,
                pid: 'a2',
                text: 12,
                children: []
            }
        ]

findIndexArray(data, id, indexArray) {
      // 根据自身节点寻找父级
      let arr = Array.from(indexArray);
      for (let i = 0, len = data.length; i < len; i++) {
        arr.push(data[i].name);
        if (data[i].id === id) {
          return arr;
        }
        let children = data[i].children;
        if (children && children.length) {
          let result = this.findIndexArray(children, id, arr);
          if (result) return result;
        }
        arr.pop();
      }
      return false;
    },

 调用：

let name = this.findIndexArray(
          this.data,
          Number(this.form.department_id),
          []
        ).join("-");

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