elementUI多级联动el-cascader动态加载数据

      <el-form-item label="举报地点：" prop="regionCode">
        <el-cascader ref="cascaderlable" placeholder="选择举报地点"
          v-model="reportForm.regionCode"
          :props="town_list_select"
          :options="one_list_select"
          clearable
          @change="handleChange"></el-cascader>
      </el-form-item>
  data() {
    return {
      one_list_select:[{
          value: 'value',
          label: 'label',
        }],
      town_list_select:{
        value: 'value',
        label: 'label',
        // checkStrictly: true,//选择
        lazy: true,
        lazyLoad: (node, resolve) => {
          this.getChildProject(node, resolve)
          }
        },
    };
  },
methonds:{
    // 举报地点选择完触发
      handleChange(value) {
        if(this.$refs['cascaderlable'].getCheckedNodes()[0].pathLabels.length==2 ){
          this.reportForm.exRegionName=this.$refs['cascaderlable'].getCheckedNodes()[0].pathLabels[0]+this.$refs['cascaderlable'].getCheckedNodes()[0].pathLabels[1]
        }else{
          this.reportForm.exRegionName=this.$refs['cascaderlable'].getCheckedNodes()[0].pathLabels[0]
        }
        if(value.length==2 ){
          this.reportForm.regionCode=value[1]
        }else{
          this.reportForm.regionCode=value
        }
        
      },
      // 获取乡镇
    getTownRegionList() {
      getRegionCodeList(BaseRegionCode.value).then((data) => {
        if (data.data.code == 0) {
          this.one_list_select = data.data.data;
        }
      });
    },
    // 获取子层数据
    getChildProject (node, resolve) {
      getRegionCodeList(node.data.value).then((data) => {
        if (data.data.code == 0) {
         let nodes = []
         let {level}=node;
          data.data.data.map(el=>{
            let obj = {
              value:el.value,
              label:el.label,
              leaf: level >= 1,
            }
            nodes.push(obj)
          })
           resolve(nodes)
        }
      });
    },
}