Element Cascader 级联选择器没有子选项选择不了父选项

			<el-cascader
              :options="favPostIdOptions"
              v-model="formData.jobChannelId"
            >
              <template slot-scope="{ data }">
                <span>{{ data.label }}</span>
              </template>
            </el-cascader>

	this.favPostIdOptions.forEach((m) => {
        m.label = m.name;
        m.value = m.jobChannelId;
        if (m.children.length > 0) {
          m.children.forEach((item) => {
            item.label = item.name;
            item.value = item.jobSubchannelId;
          });
        }
        //主要是这块 判断如果chuildren长度为0 则为undefined 
        else if (m.children.length == 0) {
          m.children = undefined;
        }
        
      });