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对象数组(JSON) 根据某个共同字段 分组

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09/26
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1.在前端页面用js处理

转载https://www.cnblogs.com/rysinal/p/5834446.html

为了第二种方法对比，特意把id 转化为pid

var arr = [
{"pid":"1001","name":"值1","value":"111"},
{"pid":"1001","name":"值1","value":"11111"},
{"pid":"1002","name":"值2","value":"25462"},
{"pid":"1002","name":"值2","value":"23131"},
{"pid":"1002","name":"值2","value":"2315432"},
{"pid":"1003","name":"值3","value":"333333"}
];var map = {},
dest = [];
for(var i = 0; i < arr.length; i++){
var ai = arr[i];
if(!map[ai.pid]){
dest.push({
pid: ai.pid,
name: ai.name,
data: [ai]
});
map[ai.pid] = ai;
}else{
for(var j = 0; j < dest.length; j++){
var dj = dest[j];
if(dj.pid == ai.pid){
dj.data.push(ai);
break;
}
}
}
}console.log(dest);

第二种，在后台处理（框架tp5）

foreach($res as $key=>$v)
{
$list[$v['pid']][] = $v;
}