javascript - Ajax Json 属性未定义

Question

我是 Json/jquery/javascript 新手，只是坚持解决这个问题。 我有一个 Ajax PUT 调用，它将一些数据发送到服务器并返回不同的响应 json。 现在的问题是我无法访问 resposne 的属性。 请不要标记“重复”，因为我已经应用了我在 stackoverflow 上找到的任何内容，例如设置数据类型和内容类型。 我也尝试过 json.parse 但是该语句被忽略，我认为这是因为它已经是 Json 了。

            request = $.ajax({
            url: reporturl,
            type: "PUT",
            data: JSON.stringify(request),
            dataType: "json",
            beforeSend: function(xhr) {
                  xhr.setRequestHeader( "Content-type", "application/json" );       

            }
            });
            request.done(function (response, textStatus, jqXHR){
            alert("Wow, it worked!");
            alert(response); //returns [object object] seems ok
            if (jqXHR.responseJSON) {
            alert("is json"); //returns yes, seems ok
            }
           var fileJSON = response.Criteria;
           alert(fileJSON); //returns undefined

现在: 1) jqXHR.responseJSON 返回 TRUE。 2) 根据 json 验证工具，“响应”是有效的 json。 响应如下所示:(需要将 Criteria 等元素加倍，我认为不会导致此问题。)

{
"response": {
    "Criteria": {
        "Criteria": [
            {
                "name": "UserRepCode1",
                "value": "XX"
            },
            {
                "name": "UserRepCode2",
                "value": "YY"
            }
        ]
    },
    "Files": {
        "Files": [
            {
                "fSeq": 0,
                "filetype": "spooler",
                "filetext": "XXX X3.07 - 22/12/2014 17:03 mk \r\n\r\nUser defined report :                            \r\nClient From : \r\nClient To : \r\nEstate From : \r\nEstate To : \r\nManager From : \r\nManager To : \r\nProperty From : DLO REVOD Road DLO REVOD Road, DLO REVOD Road999, DLO REVOD Road2\r\n : Aberdeen, Grampian, SE10 7TZDLO REVOD Road DLO REVOD Road\r\n : DLO REVOD Road999, DLO REVOD Road2, Aberdeen, Grampian\r\nCurrency Type From : Pounds SterlingPounds Sterling\r\nCurrency Type To : Pounds SterlingPounds Sterling\r\nS/C Period : 01/01/2012 - 31/12/2012 Unreconciled-00101/01/2012 - 31/12/2012 Unreconciled-001\r\nBudget Detail : Expense ClassExpense Class\r\nSubTotal By Schedule : Yes \r\nSubTotal By Expense Class : No \r\nSubTotal By Expense Category : No \r\nNominal/Gross : Nominal Nominal\r\nDisplay Transaction : No \r\nActual Expenditure : Yes \r\nPre-Payments : Yes \r\nAccruals : Yes \r\nOverhead Recovery : Yes \r\nConvert Currency : No \r\nInc Property Budgets : No \r\n\r\nOutput To : Spool\r\nHeader : Yes\r\nOrientation/Font : Portrait, Selected\r\n \r\nMKDEBUG10 Email To : \r\nDLO X3.07 - 22/12/2014 17:03 mk Page: 0\r\n__________________________________________________________________________________________________________________________________\r\n\r\nClient : GROSV001 LTD(TA)\r\nEstate : 000000000338 Park, een\r\nPeriod : 001 01/01/2012 - 31/12/2012 Unrec\r\n\r\n Nomture BudDiff\r\n To Date\r\n__________________________________________________________________________________________________________________________________\r\n\r\n\r\nProperty: 000100 DLO REVOD \r\nSchedule: 01 rty \r\n----------------------------------------------------\r\nDLO X3.07 - 22/12/2014 17:03 mk Page: 0\r\n__________________________________________________________________________________________________________________________________\r\n\r\nClient : DLO\r\nEstate : 000000000338 DLO, PSO\r\nPeriod : 001 01/01/2012 - 31/12/2012 Unreconciled\r\n\r\n XLRO\r\n To Date For Period To Date To Date To Date\r\n__________________________________________________________________________________________________________________________________\r\n\r\nDLO X3.07 - 22/12/2014 17:03 mk Page: 0\r\n__________________________________________________________________________________________________________________________________\r\n\r\nClient : DLO\r\nEstate : 000000000338 DLO, PSO\r\nPeriod : 001 01/01/2012 - 31/12/2012 Unreconciled\r\n\r\n XLRO\r\n To Date For Period To Date To Date To Date\r\n__________________________________________________________________________________________________________________________________\r\n\r\nDLO X3.07 - 22/12/2014 17:03 mk Page: 0\r\n__________________________________________________________________________________________________________________________________\r\n\r\nClient : DLO\r\nEstate : 000000000338 DLO, PSO\r\nPeriod : 001 01/01/2012 - 31/12/2012 Unreconciled\r\n\r\n XLRO\r\n To Date For Period To Date To Date To Date\r\n__________________________________________________________________________________________________________________________________\r\n\r\nDLO X3.07 - 22/12/2014 17:03 mk Page: 0\r\n__________________________________________________________________________________________________________________________________\r\n\r\nClient : DLO\r\nEstate : 000000000338 DLO, PSO\r\nPeriod : 001 01/01/2012 - 31/12/2012 Unreconciled\r\n\r\n XLRO\r\n To Date For Period To Date To Date To Date\r\n__________________________________________________________________________________________________________________________________\r\n\r\nDLO X3.07 - 22/12/2014 17:03 mk Page: 0\r\n__________________________________________________________________________________________________________________________________\r\n\r\nClient : DLO\r\nEstate : 000000000338 DLO, PSO\r\nPeriod : 001 01/01/2012 - 31/12/2012 Unreconciled\r\n\r\n XLRO\r\n To Date For Period To Date To Date To Date\r\n__________________________________________________________________________________________________________________________________\r\n\r\n10 Expense Class 10 0.00 720.00 720.00 -720.00 -100.00%\r\n --------------- --------------- --------------- --------------- ---------\r\nTotal Schedule: 01 Property 0.00 720.00 720.00 -720.00 -100.00%\r\n --------------- --------------- --------------- --------------- ---------\r\n =============== =============== =============== =============== =========\r\nTotal Period/Prop: 001 0.00 720.00 720.00 -720.00 -100.00%\r\n =============== =============== =============== =============== =========\r\n =============== =============== =============== =============== =========\r\nGrand Total for Currency GBP 0.00 720.00 720.00 -720.00 -100.00%\r\n =============== =============== =============== =============== =========\r\n"
            }
        ]
    },
    "UserMessages": {
        "UserMessages": []
    }
    }
    }

现在我陷入了困境，我应该如何检索单个属性(例如条件、文件和消息)以进行进一步处理。 请帮忙。

Answer 1

response 是保存对象的变量，而不是对象中的第一个键。

您需要引用第一个键

var fileJSON = response.response.Criteria;