uniapp用picker实现自定义三级联动（children）

<view class="invite">
        <u-cell title="点击选则" isLink :value="value" @click="shows=true"></u-cell>
        <u-picker :show="shows" ref="uPicker" :columns="columns" @confirm="confirm" @cancel="shows=false"
          @change="changeHandler"></u-picker>
      </view>

shows: false,
        columns: [],
        origiData: [],
        value: "",

async branchAppov() {
        const res = await branchAppov()
        this.origiData = res.data
        this.handelData();
      },
//初始化开始数据
      handelData() {
        // console.log(this.origiData.value))
        let sheng = [];
        let shi = [];
        let qu = [];
        this.origiData.forEach(item => {
          sheng.push(item.name);
          // 设置出初始化的数据
          if (item.name == '董事会') {
            item.children.forEach(child => {
              shi.push(child.name);
              if (child.name == '项目部') {
                child.children.forEach(el => {
                  qu.push(el.name);
                });
              }
            });
          }
        });
        this.columns.push(
          JSON.parse(JSON.stringify(sheng)),
          JSON.parse(JSON.stringify(shi)),
          JSON.parse(JSON.stringify(qu))
        );
      },
      changeHandler(e) {
        console.log(e, 333);
        const {
          columnIndex,
          value,
          values, // values为当前变化列的数组内容
          index,
          // 微信小程序无法将picker实例传出来，只能通过ref操作
          picker = this.$refs.uPicker
        } = e;
        // 当第一列值发生变化时，变化第二列(后一列)对应的选项
        if (columnIndex == 0) {
          // console.log(value)
          // picker为选择器this实例，变化第二列对应的选项
          this.origiData.forEach(item => {
            if (value[0] == item.name) {
              let shi = [];
              let flag = item.children[0];
              if(flag == undefined){
                picker.setColumnValues(1, shi);
                picker.setColumnValues(2, []);
                return
              }
              item.children.forEach((val, ol) => {
                shi.push(val.name);
                if (shi[0] == flag.name) { //设置默认开关（选择省份后设置默认城市）
                  flag = '';
                  let qu = [];
                  val.children.forEach(vol => {
                    qu.push(vol.name);
                  });
                  picker.setColumnValues(2, qu);
                }
              });
              picker.setColumnValues(1, shi);
            }
          });
        }
        //当第二列变化时，第三列对应变化
        if (columnIndex == 1) {
          this.origiData.forEach(item => {
            if (value[0] == item.name) {
              let shi = [];
              item.children.forEach((val, ol) => {
                shi.push(val.name);
                if (value[1] == val.name) {
                  let qu = [];
                  val.children.forEach(vol => {
                    qu.push(vol.name);
                  });
                  picker.setColumnValues(2, qu);
                }
              });
            }
          });
        }
      },
      // 确认选中的数据
      confirm(e) {
        console.log('confirm', JSON.stringify(e));
        this.value = e.namae[0] + e.namae[1] + e.namae[2]
        this.shows = false;
      },