javascript 数据分组

一、静态数据

[
    {"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"}
]

二、转换目标

[
    {
        "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" }
        ]
    }
]

三、转化方式

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]){// 这里是根据ID为条件，进行分组
        dest.push({
            id: ai.id,
            name: ai.name,
            data: [ai]
        });
        map[ai.id] = ai;// 对象key的唯一性，放到对象中
    }else{
        for(var j = 0; j < dest.length; j++){
            var dj = dest[j];
            if(dj.id == ai.id){// 对象中存在，并且两个ID相等，添加并跳出循环
                dj.data.push(ai);
                break;
            }
        }
    }
}

console.log(dest);// 返会数组