谁可以映射嵌套对象并删除JavaScript中的键值对

Question

我有一个对象array ，我试图创建一个新对象，但其中没有特定的key:value对。 这是我的对象。

 { "versionRoomPoolList": [{ "pmsRoomType": ["CITY"], "versionRoomTypeAttributeList": [{ "attributeDisplayId": 2, "attributeStatus": "NOCHANGE", "attributeCode": "CV", "attributeDescription": "City View" }, { "attributeDisplayId": 6, "attributeStatus": "NOCHANGE", "attributeCode": "HF", "attributeDescription": "High Floor, 8th floor and above" }, { "attributeDisplayId": 4, "attributeStatus": "NOCHANGE", "attributeCode": "KN", "attributeDescription": "1 King Bed" }, { "attributeDisplayId": 5, "attributeStatus": "NOCHANGE", "attributeCode": "NE", "attributeDescription": "Near Elevator" }, { "attributeDisplayId": 7, "attributeStatus": "NOCHANGE", "attributeCode": "RF", "attributeDescription": "Mobile Lock" }, { "attributeDisplayId": 3, "attributeStatus": "NOCHANGE", "attributeCode": "SB", "attributeDescription": "Sofabed" }, { "attributeDisplayId": 1, "attributeStatus": "NOCHANGE", "attributeCode": "SU", "attributeDescription": "Alpine Guest Room" }, { "attributeDisplayId": 8, "attributeStatus": "NOCHANGE", "attributeCode": "TS", "attributeDescription": "Separate Shower and Bathtub" } ], "roomTypeDisplayId": 31, "roomTypeId": 21, "roomTypeStatus": "NOCHANGE", "roomPool": "CITY", "maxOccupancyStatus": "NOCHANGE", "newMaxOccupancy": 4, "currentMaxOccupancy": 4, "capacityStatus": "NOCHANGE", "newCapacity": 12, "currentCapacity": 12, "guaranteed": 9, "minAvailability": 1, "premium": false, "eliteAvailability": false, "isROH": false }, { "versionRoomTypeList": [{ "pmsRoomType": ["HOSP"], "versionRoomTypeAttributeList": [{ "attributeDisplayId": 2, "attributeStatus": "NOCHANGE", "attributeCode": "CV", "attributeDescription": "City View" }, { "attributeDisplayId": 5, "attributeStatus": "NOCHANGE", "attributeCode": "HF", "attributeDescription": "High Floor, 8th floor and above" }, { "attributeDisplayId": 1, "attributeStatus": "NOCHANGE", "attributeCode": "HS", "attributeDescription": "Hospitality Suite" }, { "attributeDisplayId": 4, "attributeStatus": "NOCHANGE", "attributeCode": "KN", "attributeDescription": "1 King Bed" }, { "attributeDisplayId": 6, "attributeStatus": "NOCHANGE", "attributeCode": "RF", "attributeDescription": "Mobile Lock" }, { "attributeDisplayId": 3, "attributeStatus": "NOCHANGE", "attributeCode": "SB", "attributeDescription": "Sofabed" }, { "attributeDisplayId": 7, "attributeStatus": "NOCHANGE", "attributeCode": "TS", "attributeDescription": "Separate Shower and Bathtub" } ], "roomTypeDisplayId": 34, "roomTypeId": 24, "roomTypeStatus": "NOCHANGE", "roomPool": "HOSP", "maxOccupancyStatus": "NOCHANGE", "newMaxOccupancy": 4, "currentMaxOccupancy": 4, "capacityStatus": "NOCHANGE", "newCapacity": 1, "currentCapacity": 1, "guaranteed": 1, "minAvailability": 1, "premium": true, "eliteAvailability": false, "isROH": true }, { "pmsRoomType": ["HOSP"], "versionRoomTypeAttributeList": [{ "attributeDisplayId": 2, "attributeStatus": "NOCHANGE", "attributeCode": "CV", "attributeDescription": "City View" }, { "attributeDisplayId": 6, "attributeStatus": "NOCHANGE", "attributeCode": "HF", "attributeDescription": "High Floor, 8th floor and above" }, { "attributeDisplayId": 1, "attributeStatus": "NOCHANGE", "attributeCode": "HS", "attributeDescription": "Hospitality Suite" }, { "attributeDisplayId": 4, "attributeStatus": "NOCHANGE", "attributeCode": "KN", "attributeDescription": "1 King Bed" }, { "attributeDisplayId": 5, "attributeStatus": "NOCHANGE", "attributeCode": "NE", "attributeDescription": "Near Elevator" }, { "attributeDisplayId": 7, "attributeStatus": "NOCHANGE", "attributeCode": "RF", "attributeDescription": "Mobile Lock" }, { "attributeDisplayId": 3, "attributeStatus": "NOCHANGE", "attributeCode": "SB", "attributeDescription": "Sofabed" }, { "attributeDisplayId": 8, "attributeStatus": "NOCHANGE", "attributeCode": "TS", "attributeDescription": "Separate Shower and Bathtub" } ], "roomTypeDisplayId": 35, "roomTypeId": 25, "roomTypeStatus": "NOCHANGE", "roomPool": "HOSP", "maxOccupancyStatus": "NOCHANGE", "newMaxOccupancy": 4, "currentMaxOccupancy": 4, "capacityStatus": "NOCHANGE", "newCapacity": 1, "currentCapacity": 1, "guaranteed": 1, "minAvailability": 1, "premium": true, "eliteAvailability": false, "isROH": false } ], "roomPoolDisplayId": 4, "roomPoolStatus": "NOCHANGE", "roomPoolCode": "HOSP", "miosSRC": "YD", "sna": "N", "maxOccupancyStatus": "NOCHANGE", "newMaxOccupancy": 4, "currentMaxOccupancy": 4, "capacityStatus": "NOCHANGE", "newCapacity": 2, "currentCapacity": 2, "premium": true, "eliteAvailability": false, "excludeAlways": false, "excludeOverAuth": false, "propertySellOnly": false }, { "pmsRoomType": ["HOSP"], "versionRoomTypeAttributeList": [{ "attributeDisplayId": 2, "attributeStatus": "NOCHANGE", "attributeCode": "CV", "attributeDescription": "City View" }, { "attributeDisplayId": 5, "attributeStatus": "NOCHANGE", "attributeCode": "HF", "attributeDescription": "High Floor, 8th floor and above" }, { "attributeDisplayId": 1, "attributeStatus": "NOCHANGE", "attributeCode": "HS", "attributeDescription": "Hospitality Suite" }, { "attributeDisplayId": 4, "attributeStatus": "NOCHANGE", "attributeCode": "KN", "attributeDescription": "1 King Bed" }, { "attributeDisplayId": 6, "attributeStatus": "NOCHANGE", "attributeCode": "RF", "attributeDescription": "Mobile Lock" }, { "attributeDisplayId": 3, "attributeStatus": "NOCHANGE", "attributeCode": "SB", "attributeDescription": "Sofabed" }, { "attributeDisplayId": 7, "attributeStatus": "NOCHANGE", "attributeCode": "TS", "attributeDescription": "Separate Shower and Bathtub" } ], "roomTypeDisplayId": 34, "roomTypeId": 24, "roomTypeStatus": "NOCHANGE", "roomPool": "HOSP", "maxOccupancyStatus": "NOCHANGE", "newMaxOccupancy": 4, "currentMaxOccupancy": 4, "capacityStatus": "NOCHANGE", "newCapacity": 1, "currentCapacity": 1, "guaranteed": 1, "minAvailability": 1, "premium": true, "eliteAvailability": false, "isROH": true } ] } 

所以我想做的是在每个对象中删除pmsRoomType 。

这是我作为尝试解决此问题的更大方法的一部分而编写的。

 var data = { versionRoomPoolList: array.map(roompools, function(roompool) { roompool = lang.mixin({}, roompool); delete roompool.numAttributeChars; delete roompool.pmsRoomType; delete roompool.versionRoomTypeList[0].pmsRoomType; return roompool; }) }; 

但是我一直收到以下错误：

Uncaught TypeError: Cannot read property '0' of undefined

我假设我需要编写另一个.map方法，但是我仍然坚持这样做或这是正确的方法吗？

Answer 1

您的数据不是数组，而是具有versionRoomPoolList字段的对象。

map函数依次对数组中的每个元素调用提供的回调函数，然后从结果中构造一个新数组。

我认为这就是您要寻找的东西：使用versionRoomPoolList作为键和一个新数组作为值来创建新对象（ data ）。

var rawData = {
  "versionRoomPoolList": [
    {
      "pmsRoomType": [
        "CITY"
      ],
      "versionRoomTypeAttributeList": [
        {
          "attributeDisplayId": 2,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "CV",
          "attributeDescription": "City View"
        },
        {
          "attributeDisplayId": 6,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "HF",
          "attributeDescription": "High Floor, 8th floor and above"
        },
        {
          "attributeDisplayId": 4,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "KN",
          "attributeDescription": "1 King Bed"
        },
        {
          "attributeDisplayId": 5,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "NE",
          "attributeDescription": "Near Elevator"
        },
        {
          "attributeDisplayId": 7,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "RF",
          "attributeDescription": "Mobile Lock"
        },
        {
          "attributeDisplayId": 3,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "SB",
          "attributeDescription": "Sofabed"
        },
        {
          "attributeDisplayId": 1,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "SU",
          "attributeDescription": "Alpine Guest Room"
        },
        {
          "attributeDisplayId": 8,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "TS",
          "attributeDescription": "Separate Shower and Bathtub"
        }
      ],
      "roomTypeDisplayId": 31,
      "roomTypeId": 21,
      "roomTypeStatus": "NOCHANGE",
      "roomPool": "CITY",
      "maxOccupancyStatus": "NOCHANGE",
      "newMaxOccupancy": 4,
      "currentMaxOccupancy": 4,
      "capacityStatus": "NOCHANGE",
      "newCapacity": 12,
      "currentCapacity": 12,
      "guaranteed": 9,
      "minAvailability": 1,
      "premium": false,
      "eliteAvailability": false,
      "isROH": false
    },
    {
      "versionRoomTypeList": [
        {
          "pmsRoomType": [
            "HOSP"
          ],
          "versionRoomTypeAttributeList": [
            {
              "attributeDisplayId": 2,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "CV",
              "attributeDescription": "City View"
            },
            {
              "attributeDisplayId": 5,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "HF",
              "attributeDescription": "High Floor, 8th floor and above"
            },
            {
              "attributeDisplayId": 1,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "HS",
              "attributeDescription": "Hospitality Suite"
            },
            {
              "attributeDisplayId": 4,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "KN",
              "attributeDescription": "1 King Bed"
            },
            {
              "attributeDisplayId": 6,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "RF",
              "attributeDescription": "Mobile Lock"
            },
            {
              "attributeDisplayId": 3,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "SB",
              "attributeDescription": "Sofabed"
            },
            {
              "attributeDisplayId": 7,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "TS",
              "attributeDescription": "Separate Shower and Bathtub"
            }
          ],
          "roomTypeDisplayId": 34,
          "roomTypeId": 24,
          "roomTypeStatus": "NOCHANGE",
          "roomPool": "HOSP",
          "maxOccupancyStatus": "NOCHANGE",
          "newMaxOccupancy": 4,
          "currentMaxOccupancy": 4,
          "capacityStatus": "NOCHANGE",
          "newCapacity": 1,
          "currentCapacity": 1,
          "guaranteed": 1,
          "minAvailability": 1,
          "premium": true,
          "eliteAvailability": false,
          "isROH": true
        },
        {
          "pmsRoomType": [
            "HOSP"
          ],
          "versionRoomTypeAttributeList": [
            {
              "attributeDisplayId": 2,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "CV",
              "attributeDescription": "City View"
            },
            {
              "attributeDisplayId": 6,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "HF",
              "attributeDescription": "High Floor, 8th floor and above"
            },
            {
              "attributeDisplayId": 1,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "HS",
              "attributeDescription": "Hospitality Suite"
            },
            {
              "attributeDisplayId": 4,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "KN",
              "attributeDescription": "1 King Bed"
            },
            {
              "attributeDisplayId": 5,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "NE",
              "attributeDescription": "Near Elevator"
            },
            {
              "attributeDisplayId": 7,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "RF",
              "attributeDescription": "Mobile Lock"
            },
            {
              "attributeDisplayId": 3,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "SB",
              "attributeDescription": "Sofabed"
            },
            {
              "attributeDisplayId": 8,
              "attributeStatus": "NOCHANGE",
              "attributeCode": "TS",
              "attributeDescription": "Separate Shower and Bathtub"
            }
          ],
          "roomTypeDisplayId": 35,
          "roomTypeId": 25,
          "roomTypeStatus": "NOCHANGE",
          "roomPool": "HOSP",
          "maxOccupancyStatus": "NOCHANGE",
          "newMaxOccupancy": 4,
          "currentMaxOccupancy": 4,
          "capacityStatus": "NOCHANGE",
          "newCapacity": 1,
          "currentCapacity": 1,
          "guaranteed": 1,
          "minAvailability": 1,
          "premium": true,
          "eliteAvailability": false,
          "isROH": false
        }
      ],
      "roomPoolDisplayId": 4,
      "roomPoolStatus": "NOCHANGE",
      "roomPoolCode": "HOSP",
      "miosSRC": "YD",
      "sna": "N",
      "maxOccupancyStatus": "NOCHANGE",
      "newMaxOccupancy": 4,
      "currentMaxOccupancy": 4,
      "capacityStatus": "NOCHANGE",
      "newCapacity": 2,
      "currentCapacity": 2,
      "premium": true,
      "eliteAvailability": false,
      "excludeAlways": false,
      "excludeOverAuth": false,
      "propertySellOnly": false
    },
    {
      "pmsRoomType": [
        "HOSP"
      ],
      "versionRoomTypeAttributeList": [
        {
          "attributeDisplayId": 2,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "CV",
          "attributeDescription": "City View"
        },
        {
          "attributeDisplayId": 5,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "HF",
          "attributeDescription": "High Floor, 8th floor and above"
        },
        {
          "attributeDisplayId": 1,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "HS",
          "attributeDescription": "Hospitality Suite"
        },
        {
          "attributeDisplayId": 4,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "KN",
          "attributeDescription": "1 King Bed"
        },
        {
          "attributeDisplayId": 6,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "RF",
          "attributeDescription": "Mobile Lock"
        },
        {
          "attributeDisplayId": 3,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "SB",
          "attributeDescription": "Sofabed"
        },
        {
          "attributeDisplayId": 7,
          "attributeStatus": "NOCHANGE",
          "attributeCode": "TS",
          "attributeDescription": "Separate Shower and Bathtub"
        }
      ],
      "roomTypeDisplayId": 34,
      "roomTypeId": 24,
      "roomTypeStatus": "NOCHANGE",
      "roomPool": "HOSP",
      "maxOccupancyStatus": "NOCHANGE",
      "newMaxOccupancy": 4,
      "currentMaxOccupancy": 4,
      "capacityStatus": "NOCHANGE",
      "newCapacity": 1,
      "currentCapacity": 1,
      "guaranteed": 1,
      "minAvailability": 1,
      "premium": true,
      "eliteAvailability": false,
      "isROH": true
    }
  ]
}

var data = {
  versionRoomPoolList: rawData.versionRoomPoolList.map(function(roompool) {
    roompool = Object.assign({}, roompool);
    delete roompool.numAttributeChars;
    delete roompool.pmsRoomType;
    // make sure `versionRoomTypeList` is existed
    roompool.versionRoomTypeList && delete roompool.versionRoomTypeList[0].pmsRoomType;
    return roompool;
  })
};
console.log(data)

Answer 2

您可以尝试如下操作：

 const data = { "versionRoomPoolList": [{ "pmsRoomType": ["CITY"], "versionRoomTypeAttributeList": [{ "attributeDisplayId": 2, "attributeStatus": "NOCHANGE", "attributeCode": "CV", "attributeDescription": "City View" }, { "attributeDisplayId": 6, "attributeStatus": "NOCHANGE", "attributeCode": "HF", "attributeDescription": "High Floor, 8th floor and above" }, { "attributeDisplayId": 4, "attributeStatus": "NOCHANGE", "attributeCode": "KN", "attributeDescription": "1 King Bed" }, { "attributeDisplayId": 5, "attributeStatus": "NOCHANGE", "attributeCode": "NE", "attributeDescription": "Near Elevator" }, { "attributeDisplayId": 7, "attributeStatus": "NOCHANGE", "attributeCode": "RF", "attributeDescription": "Mobile Lock" }, { "attributeDisplayId": 3, "attributeStatus": "NOCHANGE", "attributeCode": "SB", "attributeDescription": "Sofabed" }, { "attributeDisplayId": 1, "attributeStatus": "NOCHANGE", "attributeCode": "SU", "attributeDescription": "Alpine Guest Room" }, { "attributeDisplayId": 8, "attributeStatus": "NOCHANGE", "attributeCode": "TS", "attributeDescription": "Separate Shower and Bathtub" } ], "roomTypeDisplayId": 31, "roomTypeId": 21, "roomTypeStatus": "NOCHANGE", "roomPool": "CITY", "maxOccupancyStatus": "NOCHANGE", "newMaxOccupancy": 4, "currentMaxOccupancy": 4, "capacityStatus": "NOCHANGE", "newCapacity": 12, "currentCapacity": 12, "guaranteed": 9, "minAvailability": 1, "premium": false, "eliteAvailability": false, "isROH": false }, { "versionRoomTypeList": [{ "pmsRoomType": ["HOSP"], "versionRoomTypeAttributeList": [{ "attributeDisplayId": 2, "attributeStatus": "NOCHANGE", "attributeCode": "CV", "attributeDescription": "City View" }, { "attributeDisplayId": 5, "attributeStatus": "NOCHANGE", "attributeCode": "HF", "attributeDescription": "High Floor, 8th floor and above" }, { "attributeDisplayId": 1, "attributeStatus": "NOCHANGE", "attributeCode": "HS", "attributeDescription": "Hospitality Suite" }, { "attributeDisplayId": 4, "attributeStatus": "NOCHANGE", "attributeCode": "KN", "attributeDescription": "1 King Bed" }, { "attributeDisplayId": 6, "attributeStatus": "NOCHANGE", "attributeCode": "RF", "attributeDescription": "Mobile Lock" }, { "attributeDisplayId": 3, "attributeStatus": "NOCHANGE", "attributeCode": "SB", "attributeDescription": "Sofabed" }, { "attributeDisplayId": 7, "attributeStatus": "NOCHANGE", "attributeCode": "TS", "attributeDescription": "Separate Shower and Bathtub" } ], "roomTypeDisplayId": 34, "roomTypeId": 24, "roomTypeStatus": "NOCHANGE", "roomPool": "HOSP", "maxOccupancyStatus": "NOCHANGE", "newMaxOccupancy": 4, "currentMaxOccupancy": 4, "capacityStatus": "NOCHANGE", "newCapacity": 1, "currentCapacity": 1, "guaranteed": 1, "minAvailability": 1, "premium": true, "eliteAvailability": false, "isROH": true }, { "pmsRoomType": ["HOSP"], "versionRoomTypeAttributeList": [{ "attributeDisplayId": 2, "attributeStatus": "NOCHANGE", "attributeCode": "CV", "attributeDescription": "City View" }, { "attributeDisplayId": 6, "attributeStatus": "NOCHANGE", "attributeCode": "HF", "attributeDescription": "High Floor, 8th floor and above" }, { "attributeDisplayId": 1, "attributeStatus": "NOCHANGE", "attributeCode": "HS", "attributeDescription": "Hospitality Suite" }, { "attributeDisplayId": 4, "attributeStatus": "NOCHANGE", "attributeCode": "KN", "attributeDescription": "1 King Bed" }, { "attributeDisplayId": 5, "attributeStatus": "NOCHANGE", "attributeCode": "NE", "attributeDescription": "Near Elevator" }, { "attributeDisplayId": 7, "attributeStatus": "NOCHANGE", "attributeCode": "RF", "attributeDescription": "Mobile Lock" }, { "attributeDisplayId": 3, "attributeStatus": "NOCHANGE", "attributeCode": "SB", "attributeDescription": "Sofabed" }, { "attributeDisplayId": 8, "attributeStatus": "NOCHANGE", "attributeCode": "TS", "attributeDescription": "Separate Shower and Bathtub" } ], "roomTypeDisplayId": 35, "roomTypeId": 25, "roomTypeStatus": "NOCHANGE", "roomPool": "HOSP", "maxOccupancyStatus": "NOCHANGE", "newMaxOccupancy": 4, "currentMaxOccupancy": 4, "capacityStatus": "NOCHANGE", "newCapacity": 1, "currentCapacity": 1, "guaranteed": 1, "minAvailability": 1, "premium": true, "eliteAvailability": false, "isROH": false } ], "roomPoolDisplayId": 4, "roomPoolStatus": "NOCHANGE", "roomPoolCode": "HOSP", "miosSRC": "YD", "sna": "N", "maxOccupancyStatus": "NOCHANGE", "newMaxOccupancy": 4, "currentMaxOccupancy": 4, "capacityStatus": "NOCHANGE", "newCapacity": 2, "currentCapacity": 2, "premium": true, "eliteAvailability": false, "excludeAlways": false, "excludeOverAuth": false, "propertySellOnly": false }, { "pmsRoomType": ["HOSP"], "versionRoomTypeAttributeList": [{ "attributeDisplayId": 2, "attributeStatus": "NOCHANGE", "attributeCode": "CV", "attributeDescription": "City View" }, { "attributeDisplayId": 5, "attributeStatus": "NOCHANGE", "attributeCode": "HF", "attributeDescription": "High Floor, 8th floor and above" }, { "attributeDisplayId": 1, "attributeStatus": "NOCHANGE", "attributeCode": "HS", "attributeDescription": "Hospitality Suite" }, { "attributeDisplayId": 4, "attributeStatus": "NOCHANGE", "attributeCode": "KN", "attributeDescription": "1 King Bed" }, { "attributeDisplayId": 6, "attributeStatus": "NOCHANGE", "attributeCode": "RF", "attributeDescription": "Mobile Lock" }, { "attributeDisplayId": 3, "attributeStatus": "NOCHANGE", "attributeCode": "SB", "attributeDescription": "Sofabed" }, { "attributeDisplayId": 7, "attributeStatus": "NOCHANGE", "attributeCode": "TS", "attributeDescription": "Separate Shower and Bathtub" } ], "roomTypeDisplayId": 34, "roomTypeId": 24, "roomTypeStatus": "NOCHANGE", "roomPool": "HOSP", "maxOccupancyStatus": "NOCHANGE", "newMaxOccupancy": 4, "currentMaxOccupancy": 4, "capacityStatus": "NOCHANGE", "newCapacity": 1, "currentCapacity": 1, "guaranteed": 1, "minAvailability": 1, "premium": true, "eliteAvailability": false, "isROH": true } ] } const myFunction = data => ({ ...data, versionRoomPoolList: data.versionRoomPoolList.filter(i => { delete i.pmsRoomType; return i; }), }); console.log(myFunction(data)) 

Answer 3

您的代码大部分是正确的，并且正如Felix Kling在您的帖子中评论的那样，您只需要防止出现不存在的属性即可。 这可以很简单：

if (roompool.versionRoomTypeList && roompool.versionRoomTypeList.length) {
  // delete
}

就是说...我怀疑您只是输入错误，应该将versionRoomTypeList更改为versionRoomTypeAttributeList :-P