我如何访问这个 json 对象的 multibrands.legKey 属性

如何解决我如何访问这个 json 对象的 multibrands.legKey 属性

在给定的 Json 数组对象中，我想访问属性 Multibrands.Legkey 有人可以帮我访问属性 Multibrands.Legkey。我尝试了各种方法，但我对此一无所知。我尝试像这样访问它（airLegKeyobject[0].MultiBrands[0].Legkey） 但它给出了未定义的价值？

[
        {
            "id": 0,"AirRequestType": 1,"isInstaCallResponse": false,"isDummyData": false,"DepartureAirportCode": "DFW","FilterDepart": 850,"FilterArrival": 1049,"FilterDuration": 359,"IsSameCarrior": true,"LegNumber": 1,"NoOfStops": 0,"OneWayPrice": 259,"FilterAirportCity": "SFO","ResponseID": "dcd45bf9-d07a-4566-bf83-9c35715d0615","TotalFare": 227.5,"TotalTax": 31.46,"FlightNumber": 0,"BaggageLink": "http://www.aa.com/i18n/travelInformation/baggage/main.jsp","FilterDepartCode": "DFW","FilterArrivalCode": "SFO","FilterAirportCityCode": "SFO","FilterAirlineCode": "AA","AirLegs": [
                {
                    "AirLegBrandName": "Main","AirlineCode": "AA","ArrivalAirportCode": "SFO","LegArrivalTime": "10:49a","CabinClass": "","LegDepartTime": "8:50a","IsMultipleAirline": false,"SegmentsAirlines": " American Airlines 2798 ","TotalDuration": "3h 59m","IsLowestJourneyTime": true,"IsSuppressAirline": false,"IsCorporate": true,"OnePlusDay": "0","Sourcekey": "2","AirlineCodeImagePath": "https://localhost:44304/images/air/74x74/aa.gif","IsAlternateAirportResponse": false,"IsAlternateAirportLowestResponse": false,"AirSegments": [
                        [
                            {
                                "AirCabinClass": "Economy","AirlineName": "American Airlines","ArrivalAirportCityName": "San Francisco","ArrivalDate": "2021-04-09","ArrivalStateCode": "CA","ArrivalTime": "10:49a","Baggage": "","BrandName": "","CarrierDetails": "BOEING 737-800","DepartAirportCityName": "Dallas","DepartTime": "8:50a","DepartureDate": "2021-04-09","DepartureStateCode": "TX","Duration": "3 hr 59 min","FlightNumber": "2798","LayOverTimeInfo": "","OperatedAirlineName": "American Airlines","OperatedFlightNumber": "2798","RPH": "","SeatRemaining": "6","SegmentKey": "bc7fc88f-13ee-45c2-9591-93dc2e2ce6b7","SegmentOrder": "1","DepartAirportName": ""
                            }
                        ]
                    ]
                }
            ],"MultiBrands": [
                [
                    {
                        "ResponseID": "dcd45bf9-d07a-4566-bf83-9c35715d0615","FareKey": "/","MultiBrandID": "00000000-0000-0000-0000-000000000000","ChildBrandID": "00000000-0000-0000-0000-000000000000","LegBrandName": "main","BrandTotalFare": 259,"BrandTotalPoints": 0,"DisplayName": "Main","BrandPolicyId": "","BrandPolicyKey": "","BrandReasonCode": "High","BrandReasonDescription": "High","IsLowestFare": true,"IsRefundable": false,"AwardName": "","IsAvailable": false,"IsCabinGrayOut": false,"ResBookDesigCode": "L","AirBookingClassName": "Economy","HaulType": "","BrandSeatRemaining": "6","IsSuppressed": false,"SegmentFareBasicCodes": "L0AKZNN1/F71C","SelectToPrice": false,"SegmentCabins": "Economy","BrandAminities": "","BrandUtaData": "","ITASolutionId": "","ITASessionId": "","isAirPassSearch": false,"Legkey": "DFW-SFO-AA-2798-20210409-ECON","LegkeyWithFareBasisCode": "DFW-SFO-AA-2798-20210409-ECON-L0AKZNN1"
                    }
                ]
            ]
        }```

解决方法

MultiBrands 的结构

"MultiBrands": [
                [
                    {
                        "ResponseID": "dcd45bf9-d07a-4566-bf83-9c35715d0615",

==> 由于 MultiBrands 的内容是一个数组数组。所以你应该指出索引2步骤。

const airLegKeyobject = [{"id":0,"AirRequestType":1,"isInstaCallResponse":false,"isDummyData":false,"DepartureAirportCode":"DFW","FilterDepart":850,"FilterArrival":1049,"FilterDuration":359,"IsSameCarrior":true,"LegNumber":1,"NoOfStops":0,"OneWayPrice":259,"FilterAirportCity":"SFO","ResponseID":"dcd45bf9-d07a-4566-bf83-9c35715d0615","TotalFare":227.5,"TotalTax":31.46,"FlightNumber":0,"BaggageLink":"http://www.aa.com/i18n/travelInformation/baggage/main.jsp","FilterDepartCode":"DFW","FilterArrivalCode":"SFO","FilterAirportCityCode":"SFO","FilterAirlineCode":"AA","AirLegs":[{"AirLegBrandName":"Main","AirlineCode":"AA","ArrivalAirportCode":"SFO","LegArrivalTime":"10:49a","CabinClass":"","LegDepartTime":"8:50a","IsMultipleAirline":false,"SegmentsAirlines":" American Airlines 2798 ","TotalDuration":"3h 59m","IsLowestJourneyTime":true,"IsSuppressAirline":false,"IsCorporate":true,"OnePlusDay":"0","Sourcekey":"2","AirlineCodeImagePath":"https://localhost:44304/images/air/74x74/aa.gif","IsAlternateAirportResponse":false,"IsAlternateAirportLowestResponse":false,"AirSegments":[[{"AirCabinClass":"Economy","AirlineName":"American Airlines","ArrivalAirportCityName":"San Francisco","ArrivalDate":"2021-04-09","ArrivalStateCode":"CA","ArrivalTime":"10:49a","Baggage":"","BrandName":"","CarrierDetails":"BOEING 737-800","DepartAirportCityName":"Dallas","DepartTime":"8:50a","DepartureDate":"2021-04-09","DepartureStateCode":"TX","Duration":"3 hr 59 min","FlightNumber":"2798","LayOverTimeInfo":"","OperatedAirlineName":"American Airlines","OperatedFlightNumber":"2798","RPH":"","SeatRemaining":"6","SegmentKey":"bc7fc88f-13ee-45c2-9591-93dc2e2ce6b7","SegmentOrder":"1","DepartAirportName":""}]]}],"MultiBrands":[[{"ResponseID":"dcd45bf9-d07a-4566-bf83-9c35715d0615","FareKey":"/","MultiBrandID":"00000000-0000-0000-0000-000000000000","ChildBrandID":"00000000-0000-0000-0000-000000000000","LegBrandName":"main","BrandTotalFare":259,"BrandTotalPoints":0,"DisplayName":"Main","BrandPolicyId":"","BrandPolicyKey":"","BrandReasonCode":"High","BrandReasonDescription":"High","IsLowestFare":true,"IsRefundable":false,"AwardName":"","IsAvailable":false,"IsCabinGrayOut":false,"ResBookDesigCode":"L","AirBookingClassName":"Economy","HaulType":"","BrandSeatRemaining":"6","IsSuppressed":false,"SegmentFareBasicCodes":"L0AKZNN1/F71C","SelectToPrice":false,"SegmentCabins":"Economy","BrandAminities":"","BrandUtaData":"","ITASolutionId":"","ITASessionId":"","isAirPassSearch":false,"Legkey":"DFW-SFO-AA-2798-20210409-ECON","LegkeyWithFareBasisCode":"DFW-SFO-AA-2798-20210409-ECON-L0AKZNN1"}]]}];

console.log(airLegKeyobject[0].MultiBrands[0][0].Legkey);