省市区三级联动回显问题，

Question

html部分：

<el-form-item label="发货地址">
        <el-cascader
          ref="myCascader"
          v-model="params.shippingAddress"
          :props="cityProps"
          :options="options"
          clearable
          @change="addressChange"
        ></el-cascader>
      </el-form-item>

daa部分：
 params: {
        logisticsName: "",
        chargeType: 1,
        distributionType: "", //配送方式
        shippingAddress:[],
        // distributionTypeName: "",
        charges: [
          {
            weight: "",
            price: "",
            secondWeight: "",
            secondPrice: "",
            regions: [],
          },
        ],
      },

按钮方法部分：
 // 查看详情
    async getDetails() {
      const res = await logisticsGetById({ logisticsId: this.checkId });
      console.log(res.data);
      if (res.code === "200") {
        let city;
      city =  res.data.shippingAddressArray.join('/')
      console.log(city);
      this.params.shippingAddress = city
      console.log(this.params.shippingAddress);
        this.params = res.data;
        
      }
    },

打印部分：

Answer 1

让后端给你返回最后一级的ID，或者你试试只写最后一级的中文能不能回显出来，两种都是字符串格式，不是数组