javascript - 如何删除特定的嵌套 json 属性

Question

我想删除出现的 __metadata 。如何做到这一点我搜索了这个问题，但没有得到确切的解决方案。希望你能帮帮我。

{
  "__metadata":{
     "uri":"asd",
     "type":"DP_CART_SRV.DPCARTHeader"
  },
  "Dealer":{
     "__metadata":{
        "uri":"asd"
     },
     "CustomerNo":"",
     "Name1":"",
     "Name2":""
  },
  "Retailer":{
     "__metadata":{
        "uri":"asd"
     },
     "CustomerNo":"",
     "Name1":"",
     "Name2":""
  },
  "Cart":"0000000081",
  "Type":"SH",
  "CreatedOn":"/Date(1399420800000)/",
  "ChangedOn":null,
  "OrderId":"",
  "OrderType":"",
  "ReqDeliveryDate":"2014/05/31",
  "OrderValue":"11.00",
  "DocCurrency":"EUR",
  "NetValue":"11.00",
  "Freight":"0.00",
  "Discount":"0.00",
  "Tax":"0.00",
  "Remarks":"Remarks",
  "Items":{
     "results":[
        {
           "__metadata":{
              "uri":"asd"
           },
           "Cart":"0000000081",
           "ItemNo":"000010",
           "ProductID":"FAN_FG1",
           "ItemDesc":"Finshed product FAN",
           "Quantity":"1.000",
           "Uom":"KAR",
           "Price":"11.00",
           "Currency":"EUR",
           "Available":"",
           "DeleteStatus":""
        },
        {
           "__metadata":{
              "uri":"",
              "type":""
           },
           "DeleteStatus":"",
           "Available":"",
           "Currency":"",
           "Price":"",
           "Uom":"",
           "Quantity":"",
           "ItemDesc":"",
           "ProductID":"",
           "ItemNo":"",
           "Cart":""
        }
     ]
  }
}

Answer 1

这是一个有趣的。不是很明显的方法:

var result = JSON.parse(JSON.stringify(obj, function(key, value) {
    return key !== '__metadata' ? value : undefined;
}));

它使用replacer 函数JSON.stringify方法接受:

replacer If a function, transforms values and properties encountered while stringifying; if an array, specifies the set of properties included in objects in the final string. A detailed description of the replacer function is provided in the javaScript guide article Using native JSON.

但是请注意，这不是 JSON.stringify 和 JSON.parse 的用途。当然 result 将不再是原始对象，而是 < em>新对象。

演示:http://jsfiddle.net/7Gj47/