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订单响应：解释 orders 首部插入导致的多处差异

数组按下标逐项比较。在 orders 开头插入记录后，后续元素位置移动，会产生多处修改和一个尾部新增；这不等于多条业务记录都发生了真实字段变更。需要按 ID 配对时应先在自己的业务逻辑中处理。

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示例工作台

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JSON 结构对比修改下方数据后重新运行
运行结果
[
  {
    "op": "replace",
    "path": "/data/orders/0/orderId",
    "oldValue": "demo-orders-1",
    "value": "demo-inserted"
  },
  {
    "op": "replace",
    "path": "/data/orders/0/subject",
    "oldValue": "演示订单甲",
    "value": "新增演示记录"
  },
  {
    "op": "replace",
    "path": "/data/orders/1/orderId",
    "oldValue": "demo-orders-2",
    "value": "demo-orders-1"
  },
  {
    "op": "replace",
    "path": "/data/orders/1/subject",
    "oldValue": "演示订单乙",
    "value": "演示订单甲"
  },
  {
    "op": "replace",
    "path": "/data/orders/1/quantity",
    "oldValue": 1,
    "value": 2
  },
  {
    "op": "replace",
    "path": "/data/orders/1/paid",
    "oldValue": false,
    "value": true
  },
  {
    "op": "replace",
    "path": "/data/orders/1/status",
    "oldValue": "completed",
    "value": "pending"
  },
  {
    "op": "replace",
    "path": "/data/orders/1/delivery/city",
    "oldValue": "上海",
    "value": "北京"
  },
  {
    "op": "replace",
    "path": "/data/orders/1/delivery/items/0/sku",
    "oldValue": "B02",
    "value": "A01"
  },
  {
    "op": "replace",
    "path": "/data/orders/1/delivery/items/0/count",
    "oldValue": 1,
    "value": 2
  },
  {
    "op": "add",
    "path": "/data/orders/2",
    "value": {
      "orderId": "demo-orders-2",
      "subject": "演示订单乙",
      "quantity": 1,
      "paid": false,
      "status": "completed",
      "delivery": {
        "city": "上海",
        "items": [
          {
            "sku": "B02",
            "count": 1
          }
        ]
      }
    }
  }
]

原例已核验，可修改输入后重新运行。

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01

场景与操作说明

订单返回中，订单号用于关联记录，数量用于计算，支付标记和流程状态分别表达不同信息。下面使用两条订单及各自的配送明细，练习提取标识、核对数量类型和定位状态变化。

quantity 为本例商品件数；金额应另行约定精度与币种。

  1. 核对 订单响应 的字段层级，保留 orderId 的字符串类型。
  2. 修改一项输入并运行，观察结果中的值或路径如何变化。
  3. 载入对照样本，复现下面的变化；恢复原例会替换当前输入。
02

对照样本

对照样本交换 A 与 B。观察新增与删除的方向、修改前后值如何反转；没有差异时交换仍无差异。

查看对照输入
{
  "ok": true,
  "data": {
    "orders": [
      {
        "orderId": "demo-inserted",
        "subject": "新增演示记录",
        "quantity": 2,
        "paid": true,
        "status": "pending",
        "delivery": {
          "city": "北京",
          "items": [
            {
              "sku": "A01",
              "count": 2
            }
          ]
        }
      },
      {
        "orderId": "demo-orders-1",
        "subject": "演示订单甲",
        "quantity": 2,
        "paid": true,
        "status": "pending",
        "delivery": {
          "city": "北京",
          "items": [
            {
              "sku": "A01",
              "count": 2
            }
          ]
        }
      },
      {
        "orderId": "demo-orders-2",
        "subject": "演示订单乙",
        "quantity": 1,
        "paid": false,
        "status": "completed",
        "delivery": {
          "city": "上海",
          "items": [
            {
              "sku": "B02",
              "count": 1
            }
          ]
        }
      }
    ],
    "summary": {
      "total": 2,
      "note": null
    }
  }
}
{
  "ok": true,
  "data": {
    "orders": [
      {
        "orderId": "demo-orders-1",
        "subject": "演示订单甲",
        "quantity": 2,
        "paid": true,
        "status": "pending",
        "delivery": {
          "city": "北京",
          "items": [
            {
              "sku": "A01",
              "count": 2
            }
          ]
        }
      },
      {
        "orderId": "demo-orders-2",
        "subject": "演示订单乙",
        "quantity": 1,
        "paid": false,
        "status": "completed",
        "delivery": {
          "city": "上海",
          "items": [
            {
              "sku": "B02",
              "count": 1
            }
          ]
        }
      }
    ],
    "summary": {
      "total": 2,
      "note": null
    }
  }
}

对照样本的实际结果

[
  {
    "op": "replace",
    "path": "/data/orders/0/orderId",
    "oldValue": "demo-inserted",
    "value": "demo-orders-1"
  },
  {
    "op": "replace",
    "path": "/data/orders/0/subject",
    "oldValue": "新增演示记录",
    "value": "演示订单甲"
  },
  {
    "op": "replace",
    "path": "/data/orders/1/orderId",
    "oldValue": "demo-orders-1",
    "value": "demo-orders-2"
  },
  {
    "op": "replace",
    "path": "/data/orders/1/subject",
    "oldValue": "演示订单甲",
    "value": "演示订单乙"
  },
  {
    "op": "replace",
    "path": "/data/orders/1/quantity",
    "oldValue": 2,
    "value": 1
  },
  {
    "op": "replace",
    "path": "/data/orders/1/paid",
    "oldValue": true,
    "value": false
  },
  {
    "op": "replace",
    "path": "/data/orders/1/status",
    "oldValue": "pending",
    "value": "completed"
  },
  {
    "op": "replace",
    "path": "/data/orders/1/delivery/city",
    "oldValue": "北京",
    "value": "上海"
  },
  {
    "op": "replace",
    "path": "/data/orders/1/delivery/items/0/sku",
    "oldValue": "A01",
    "value": "B02"
  },
  {
    "op": "replace",
    "path": "/data/orders/1/delivery/items/0/count",
    "oldValue": 2,
    "value": 1
  },
  {
    "op": "remove",
    "path": "/data/orders/2",
    "oldValue": {
      "orderId": "demo-orders-2",
      "subject": "演示订单乙",
      "quantity": 1,
      "paid": false,
      "status": "completed",
      "delivery": {
        "city": "上海",
        "items": [
          {
            "sku": "B02",
            "count": 1
          }
        ]
      }
    }
  }
]