希望的是将下面的对象数组：

[    {"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"} ]

根据相同id字段分组，转换成下面这种形式：

[    {        "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" } ] } ]

做法：

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);