Js获取3天内的数据

      $.each(MyData, function (i, n) {

                var NowDate = new Date();
                var UpdateDate = n.UpdateTime;
                var dt2 = new Date(Date.parse(UpdateDate.replace(/-/g, '/')));
                var datedeff = NowDate - dt2;
                var days = Math.floor(datedeff / (24 * 3600 * 1000));

                if (days <= 3)