The JS object array is weighed against the elements in the object.

<script type= "Text/javascript" >//according to Sys_time and Loc_time.    varTMP =         [            {                "id": 1,                "Sys_time": "2015-03-09 15:15:08",//repeat with ID 2"Loc_time": "2015-03-09 15:16:38"            },             {                "ID": 2,                "Sys_time": "2015-03-09 15:15:08",                 "Loc_time": "2015-03-09 15:15:38",//Repeat with ID 3 (but since Sys_time has been duplicated with ID 1, it will not actually participate in Loc_time)            },             {                "ID": 3,                "Sys_time": "2015-03-09 15:16:08",                 "Loc_time": "2015-03-09 15:15:38",                             },            {                "ID": 4,                "Sys_time": "2015-03-09 15:17:08",                 "Loc_time": "2015-03-09 15:17:38",             }        ] //For (n in tmp) {    //tmp[n].sys_time = new Date (tmp[n].sys_time). GetTime ();    // }        varresult = [], hash = {}; Hash_ = {}     for(vari = 0; i<tmp.length; i++) {        varElem =Tmp[i].sys_time; varElem_ =Tmp[i].loc_time; if(!Hash[elem]) {            if(!Hash_[elem_])                {Result.push (tmp[i]); HASH_[ELEM_]=true;            }; Hash[elem]=true; }} console.log (Result)</script>

Results:

[    {        "id": 1,        "sys_time": "2015-03-09 15:15:08",        "loc_time": "2015-03-09 15:16:38 "    },     {        " id ": 3,        " sys_time ":" 2015-03-09 15:16:08 ",          "Loc_time": "2015-03-09 15:15:38",             },    {        "id": 4,        "sys_time": "2015-03-09 15:17:08 ",         " loc_time ":" 2015-03-09 15:17:38 ",     }]

The JS object array is weighed against the elements in the object.