json对象中根据主键判断是否有重复数据

 function funCheckRepeat() {
        var ids = $(gridId).jqGrid('getGridParam', 'selarrrow');
        if (ids.length == 0) {
            alert("请选择服务项目！");
            return;
        }
        var dataList = new Array();
        for (i = 0; i < ids.length; i++) {
            var json = $(gridId).getRowData(ids[i]);
            dataList[i] = json;
        }

        var s_json = JSON.stringify(dataList);


        for (i = 0; i < ids.length; i++) {
            var fjh=dataList[i].DRFJXX_FJH;
            var reg = s_json.match(eval('/"DRFJXX_FJH":"' + fjh + '"/g'));
            if (null != reg) {

                var reg1 = s_json.match(eval('/("DRFJXX_FJH":"' + fjh + '",)(.*?)(")/g'));                
                if (reg1 != null) {
                    if (reg1.length > 1) {
                        alert("相同的飞机号【"+fjh+"】只能选择一个!");
                        return false;
                    }
                }
            }
        }
        return true;
       
    }