JavaScript实现JSON数组按ID分组合并示例

<script>
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);
/*
//运行结果：
[
  {
    "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" }
    ]
  }
]
*/
</script>