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设备列表：解释 devices 首部插入导致的多处差异

数组按下标逐项比较。在 devices 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。

浏览器本地处理合成数据同场景 32 个案例 ↗
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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/devices/0/deviceId",
    "oldValue": "demo-devices-1",
    "value": "demo-inserted"
  },
  {
    "op": "replace",
    "path": "/data/devices/0/modelName",
    "oldValue": "演示传感终端",
    "value": "新增演示记录"
  },
  {
    "op": "replace",
    "path": "/data/devices/1/deviceId",
    "oldValue": "demo-devices-2",
    "value": "demo-devices-1"
  },
  {
    "op": "replace",
    "path": "/data/devices/1/modelName",
    "oldValue": "演示网关设备",
    "value": "演示传感终端"
  },
  {
    "op": "replace",
    "path": "/data/devices/1/battery",
    "oldValue": 100,
    "value": 85
  },
  {
    "op": "replace",
    "path": "/data/devices/1/online",
    "oldValue": false,
    "value": true
  },
  {
    "op": "replace",
    "path": "/data/devices/1/connection",
    "oldValue": "ethernet",
    "value": "wifi"
  },
  {
    "op": "replace",
    "path": "/data/devices/1/hardware/firmware",
    "oldValue": "demo-2.0",
    "value": "demo-1.0"
  },
  {
    "op": "replace",
    "path": "/data/devices/1/hardware/ports/0",
    "oldValue": "lan",
    "value": "usb"
  },
  {
    "op": "remove",
    "path": "/data/devices/1/hardware/ports/1",
    "oldValue": "usb"
  },
  {
    "op": "add",
    "path": "/data/devices/2",
    "value": {
      "deviceId": "demo-devices-2",
      "modelName": "演示网关设备",
      "battery": 100,
      "online": false,
      "connection": "ethernet",
      "hardware": {
        "firmware": "demo-2.0",
        "ports": [
          "lan",
          "usb"
        ]
      }
    }
  }
]

原例已核验，可修改输入后重新运行。

⌘ / Ctrl + Enter 运行
01

场景与操作说明

设备在线标记是采样时刻的状态，不能说明设备现在仍在线。此案例不扫描网络或连接任何设备。

battery 为演示百分比；网关的 100 只是样本值，不表示真实电源检测。

  1. 核对 设备列表 的字段层级，保留 deviceId 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": {
    "devices": [
      {
        "deviceId": "demo-inserted",
        "modelName": "新增演示记录",
        "battery": 85,
        "online": true,
        "connection": "wifi",
        "hardware": {
          "firmware": "demo-1.0",
          "ports": [
            "usb"
          ]
        }
      },
      {
        "deviceId": "demo-devices-1",
        "modelName": "演示传感终端",
        "battery": 85,
        "online": true,
        "connection": "wifi",
        "hardware": {
          "firmware": "demo-1.0",
          "ports": [
            "usb"
          ]
        }
      },
      {
        "deviceId": "demo-devices-2",
        "modelName": "演示网关设备",
        "battery": 100,
        "online": false,
        "connection": "ethernet",
        "hardware": {
          "firmware": "demo-2.0",
          "ports": [
            "lan",
            "usb"
          ]
        }
      }
    ],
    "summary": {
      "total": 2,
      "note": null
    }
  }
}
{
  "ok": true,
  "data": {
    "devices": [
      {
        "deviceId": "demo-devices-1",
        "modelName": "演示传感终端",
        "battery": 85,
        "online": true,
        "connection": "wifi",
        "hardware": {
          "firmware": "demo-1.0",
          "ports": [
            "usb"
          ]
        }
      },
      {
        "deviceId": "demo-devices-2",
        "modelName": "演示网关设备",
        "battery": 100,
        "online": false,
        "connection": "ethernet",
        "hardware": {
          "firmware": "demo-2.0",
          "ports": [
            "lan",
            "usb"
          ]
        }
      }
    ],
    "summary": {
      "total": 2,
      "note": null
    }
  }
}

对照样本的实际结果

[
  {
    "op": "replace",
    "path": "/data/devices/0/deviceId",
    "oldValue": "demo-inserted",
    "value": "demo-devices-1"
  },
  {
    "op": "replace",
    "path": "/data/devices/0/modelName",
    "oldValue": "新增演示记录",
    "value": "演示传感终端"
  },
  {
    "op": "replace",
    "path": "/data/devices/1/deviceId",
    "oldValue": "demo-devices-1",
    "value": "demo-devices-2"
  },
  {
    "op": "replace",
    "path": "/data/devices/1/modelName",
    "oldValue": "演示传感终端",
    "value": "演示网关设备"
  },
  {
    "op": "replace",
    "path": "/data/devices/1/battery",
    "oldValue": 85,
    "value": 100
  },
  {
    "op": "replace",
    "path": "/data/devices/1/online",
    "oldValue": true,
    "value": false
  },
  {
    "op": "replace",
    "path": "/data/devices/1/connection",
    "oldValue": "wifi",
    "value": "ethernet"
  },
  {
    "op": "replace",
    "path": "/data/devices/1/hardware/firmware",
    "oldValue": "demo-1.0",
    "value": "demo-2.0"
  },
  {
    "op": "replace",
    "path": "/data/devices/1/hardware/ports/0",
    "oldValue": "usb",
    "value": "lan"
  },
  {
    "op": "add",
    "path": "/data/devices/1/hardware/ports/1",
    "value": "usb"
  },
  {
    "op": "remove",
    "path": "/data/devices/2",
    "oldValue": {
      "deviceId": "demo-devices-2",
      "modelName": "演示网关设备",
      "battery": 100,
      "online": false,
      "connection": "ethernet",
      "hardware": {
        "firmware": "demo-2.0",
        "ports": [
          "lan",
          "usb"
        ]
      }
    }
  }
]