JSON根据共同字段分组

转自：https://blog.csdn.net/lamyuqingcsdn/article/details/51123177
目标

     [
        {"id":"1001","name":"值1","value":"111"},
        {"id":"1001","name":"值1","value":"11111"},
        {"id":"1002","name":"值2","value":"25462"},
        {"id":"1002","name":"值2","value":"23131"},
        {"id":"1002","name":"值2","value":"2315432"},
        {"id":"1003","name":"值3","value":"333333"}
      ]

转化成

    [
{
    "id": "1001",
    "name": "值1",
    "data": [
        {"id": "1001", "name": "值1", "value": "111"},
        { "id": "1001", "name": "值1", "value": "11111"}
    ]
},
{
    "id": "1002",
    "name": "值2",
    "data": [
        { "id": "1002",  "name": "值2", "value": "25462" },
        { "id": "1002", "name": "值2", "value": "23131"},
        {"id": "1002", "name": "值2","value": "2315432" }
    ]
},
{
    "id": "1003",
    "name": "值3",
    "data": [
        {"id": "1003", "name": "值3", "value": "333333" }
    ]
}
    ]

js

    var arr = [
        {"id":"1001","name":"值1","value":"111"},
        {"id":"1001","name":"值1","value":"11111"},
        {"id":"1002","name":"值2","value":"25462"},
        {"id":"1002","name":"值2","value":"23131"},
        {"id":"1002","name":"值2","value":"2315432"},
        {"id":"1003","name":"值3","value":"333333"}
    ];

    var map = {},
        dest = [];
    for(var i = 0; i < arr.length; i++){
        var ai = arr[i];
        if(!map[ai.id]){
            dest.push({
                id: ai.id,
                name: ai.name,
                data: [ai]
            });
            map[ai.id] = ai;
        }else{
            for(var j = 0; j < dest.length; j++){
                var dj = dest[j];
                if(dj.id == ai.id){
                    dj.data.push(ai);
                    break;
                }
            }
        }
    }

    console.log(dest);