js统计，然后去重例子

 var list=new Array();
         for(var i=0;i<result.length;i++){
             examsubject=result[i].examsubject;
             list.add(parseInt(examsubject));
         }
         //统计相同科目的个数,也就是单个科目的座位总数
         var map = {};
         for(var i = 0;i < list.length;i++)
         {
             var ai = list[i];
             if (!map[ai])
             {
                 map[ai] = 1;
             }
             else
             {
                 map[ai]++;
             }
         }
         var arr=[];
         for(var key in map){
             var examsubjectid=key;
             var examsubjectname=LEAP.getCodeText("LSIP_examsubject",examsubjectid);
             var examtypename=LEAP.getCodeText("LSIP_examtype",50);
             var seatnumber=map[key];
             var ar={
                 "companyname":"职业技术考试中心",
                 "companyno":"8000",
                 "examsubjectname":examsubjectname,
                 "examsubjectid":examsubjectid,
                 "examtypeid":"50",
                 "examtypename":examtypename,
                 "seatnumber":seatnumber
                 };
             arr.push(ar);
         }