javascript - 在 jQuery 中使用动态对象名称重新格式化 JSON

Question

我有一组简单的 JSON，需要重新格式化，因为并非总是输出所有键值对。

{
"result": [
    {
        "category": "Negative Notification",
        "event": "open",
        "result": 2
    },
    {
        "category": "Referral",
        "event": "bounce",
        "result": 1
    },
    {
        "category": "Negative Notification",
        "event": "delivered",
        "result": 34
    },
    {
        "category": "Negative Notification",
        "event": "processed",
        "result": 34
    },
    {
        "category": "Positive Notification",
        "event": "open",
        "result": 42
    },
    {
        "category": "Referral",
        "event": "delivered",
        "result": 17
    },
    {
        "category": "Positive Notification",
        "event": "processed",
        "result": 504
    },
    {
        "category": "Referral",
        "event": "processed",
        "result": 18
    },
    {
        "category": "Positive Notification",
        "event": "delivered",
        "result": 504
    },
    {
        "category": "Negative Notification",
        "event": "bounce",
        "result": 16
    },
    {
        "category": "Positive Notification",
        "event": "bounce",
        "result": 176
    },
    {
        "category": "Referral",
        "event": "open",
        "result": 10
    }
]
}

输出方式的问题取决于数据是否可用的天气，按数字访问对象可能会产生意外的功能。第二个问题是它必须由javascript操作，并且不能在服务器端操作。

我希望重新格式化 JSON，以便每个类别都是一个对象(当前有 3 个，但可能多达 5 个)，并在对象内汇总了数据。例如:

{
"result": {
    "Negative Notification" : [ 
        {
        "processed":34,
        "delivered":34,
        "bounces":16,
        "opens":2
        }
    ],
    "Positive Notification" : [
        {
        "processed":504,
        "delivered":504,
        "bounces":176,
        "opens":42
        }
    ],
    "Referral" : [
        {
        "processed":18,
        "delivered":17,
        "bounces":1,
        "opens":10
        }
    ]

}
}

我该如何完成这个任务？简单地循环并命名对象不会给我带来任何结果。

Answer 1

作为 T.J Crowder 建议的补充:基本原理相同，只是不依赖 ES5 函数，也不需要垫片。 注意:此解决方案在某种程度上与您的“所需输出”有所不同:我不是让每个类别引用只有 1 个元素(对象文字)的数组，而是只需直接为其分配一个对象文字即可。您想要的格式将要求您访问退回的推荐，如下所示:obj.result.Referral[0].bounces ，而我认为如果是 obj.result.Referral.bounces 更有意义，中间没有数组。

//suppose a is the raw JSON data
var b = {result:{}};//this will become be the object you want
for (var i=0;i<a.result.length;i++)
{
    b.result[a.result[i].category] = (function(obj)
    {
        var p, res = {};
        for (p in obj)
        {
            if (p !== 'category' && obj.hasOwnProperty(p))
            {
                res[p] = obj[p];
            }
        }
        return res;
    }(a.result[i]));
}

这会循环遍历由 a.result 引用的数组，每次使用 a.result[i].category 的值作为保存其他数据的对象的属性名称。
结果是:

console.log(JSON.stringify(b));
{"result":
    {"Negative Notification":
        {"event":"bounce",
         "result":16},
    "Referral":
        {"event":"open",
         "result":10},
    "Positive Notification":
        {"event":"bounce","result":176}
    }
}

但实际上:为什么不在发送数据之前格式化数据呢？如果您有权访问输出此数据的代码，请更改该代码以更好地满足您的需求。

编辑:
针对您的评论，我认为您真正想要的是:

var b={result{}};
for (i=0;i<a.result.length;i++)
{
    b.result[a.result[i].category] = b.result[a.result[i].category] || {};//use existing, or create new object
    b.result[a.result[i].category][a.result[i].event] = a.result[i].result;//add property for event type, assign value
}

运行此代码后，对象 b看起来像这样:

{"result":
    {"Negative Notification":
        {"open":2,
         "delivered":34,
         "processed":34,
         "bounce":16},
      "Referral":
        {"bounce":1,
         "delivered":17,
         "processed":18,
         "open":10},
      "Positive Notification":
         {"open":42,
          "processed":504,
          "delivered":504,
          "bounce":176}
     }
}

这意味着，不要使用 b.result.Referral[0].bounce ，您可以使用b.result.Referral.bounce 。但更重要的是，没有必要 result首先的属性:

var result ={};
for (i=0;i<a.result.length;i++)
{
    result[a.result[i].category] = result[a.result[i].category] || {};
    result[a.result[i].category][a.result[i].event] = a.result[i].result;
}
console.log(result);

{"Negative Notification":
    {"open":2,
     "delivered":34,
     "processed":34,
     "bounce":16},
  "Referral":
    {"bounce":1,
     "delivered":17,
     "processed":18,
     "open":10},
  "Positive Notification":
     {"open":42,
      "processed":504,
      "delivered":504,
      "bounce":176}
 }