如何遍历JSON对象的属性？

问题描述：

我想通过JSON对象的属性循环，但无法这样做。如何遍历JSON对象的属性？

var ds={ 
    "Table": [ 
    { 
     "SrNo": 1, 
     "AuctionName": "test auction", 
     "AuctionDescription": "auction desc", 
     "Testproject": "Y", 
     "State": "India", 
     "City": "2", 
     "CompanyName": "IIFL", 
     "Commodity": "10001", 
     "BaseLineSpend": "50000", 
     "ContractMonths": "5", 
     "Owner": "arbaaz", 
     "PreviewBids": "Y", 
     "PrebidEndTime": "2015-09-11T18:00:00", 
     "BiddingStartTime": "2015-09-10T18:00:00", 
     "FirstTimeRunTime": 10, 
     "TimeBtwLotClosing": 15, 
     "BidRank": "20", 
     "StartOverTime": 25, 
     "OverTime": 30, 
     "Buffer": "Y", 
     "ImproveBidBy": "PERCENTAGE", 
     "TieBids": "Y", 
     "ActiveObservers": "Babitha G-C140492,", 
     "Observers": "Tabrez Abdul Aziz Shaikh-A185615,", 
     "ProjectOwner": "Tahir - Siddiqui-C107037,Tahir Ali-C132420,", 
     "Administrator": "Rabi Roy-V182597,Gagan Kondalana Poonacha-C134452,Rabindra Kumar Choubey-C139454,", 
     "GUID": "200869b0-e6be-4642-95ec-97509e457d63", 
     "MkrId": "C123627", 
     "MkrDt": "2015-09-03T16:23:15.917", 
     "IsCreated": null 
    } 
    ] 
}

基于对stackoverflow的其他类似问题。我想：

var DataSet = jQuery.parseJSON(ds);     
    var json_parsed = DataSet.Table;  

var items = json_parsed.Items; // this is always undefined in console. 
for (var i = 0; i < items.length; ++i) { 
    console.log("Item #" + i); 
    for (var name in items[i]) { 
     alert(name + "=" + items[i][name]); 
    } 
}

我在控制台中看到undefined在json_parsed.Items;。

我期待的属性名称将显示在alert中，例如：Srno，AuctionName ..等等。

ds是一个主题。 jQuery.parseJSON需要一个字符串作为参数。 –

当你已经有一个解析对象时，你不需要调用'parseJSON'。 – Barmar

同样的问题http://stackoverflow.com/questions/85992/how-do-i-enumerate-the-properties-of-a-javascript-object – astroanu

答

那么，表是一个数组，开始。其次，即使你使用Table[0].Items，也没有Items属性，这就是为什么你得到“未定义”。

那么试试这个来代替：

var items = json_parsed[0]; 
for (var name in items) { 
    alert(name + "=" + items[name]); 
}

DEMO

不工作：http://jsfiddle.net/fvfppe8k/ – Arbaaz

@Arbaaz，我更新了我的答案，包括演示。再试一次。 – Andy

'json_parsed [0];'确实做了什么？ – Arbaaz

答

我看到你在那里有jQuery的。 Javascript方法很好。但是，如果你想循环jQuery中的JSON对象，那么你可以尝试下面的代码：

var ds={ 
    "Table": [ 
    { 
     "SrNo": 1, 
     "AuctionName": "test auction", 
     "AuctionDescription": "auction desc", 
     "Testproject": "Y", 
     "State": "India", 
     "City": "2", 
     "CompanyName": "IIFL", 
     "Commodity": "10001", 
     "BaseLineSpend": "50000", 
     "ContractMonths": "5", 
     "Owner": "arbaaz", 
     "PreviewBids": "Y", 
     "PrebidEndTime": "2015-09-11T18:00:00", 
     "BiddingStartTime": "2015-09-10T18:00:00", 
     "FirstTimeRunTime": 10, 
     "TimeBtwLotClosing": 15, 
     "BidRank": "20", 
     "StartOverTime": 25, 
     "OverTime": 30, 
     "Buffer": "Y", 
     "ImproveBidBy": "PERCENTAGE", 
     "TieBids": "Y", 
     "ActiveObservers": "Babitha G-C140492,", 
     "Observers": "Tabrez Abdul Aziz Shaikh-A185615,", 
     "ProjectOwner": "Tahir - Siddiqui-C107037,Tahir Ali-C132420,", 
     "Administrator": "Rabi Roy-V182597,Gagan Kondalana Poonacha-C134452,Rabindra Kumar Choubey-C139454,", 
     "GUID": "200869b0-e6be-4642-95ec-97509e457d63", 
     "MkrId": "C123627", 
     "MkrDt": "2015-09-03T16:23:15.917", 
     "IsCreated": null 
    } 
    ] 
} 


var jsonData = ds.Table[0]; 
$.each(jsonData, function(index, value) { 
    console.log(index + '=' + value); 
});

如何遍历JSON对象的属性？

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