框架-Jquerychange事件数值计算

//优惠率计算优惠价
            $("body").on("change", "#Rate", function() {
                var ratePrice = 0;
                var rate=$("#Rate").val();
                var sUrl = "/manage/BaseDoMove/GetJsonProduct?ProductCode=" + $("#ProductCodes").val();
                var retInfo = eval("(" + $.asAjaxPost(sUrl, {}) + ")");
                var lessonCostPrice = "";
                $.each(retInfo, function(n, value) {
                    lessonCostPrice += value.LessonCostPrice;
                });
                ratePrice = (rate / 100) * lessonCostPrice;
                $("#RatePrice").val(ratePrice);
            });
            //优惠价计算优惠率
            $("body").on("change", "#RatePrice", function() {
                var rate = 0;
                var ratePrice=$("#RatePrice").val();
                var sUrl = "/manage/BaseDoMove/GetJsonProduct?ProductCode=" + $("#ProductCodes").val();
                var retInfo = eval("(" + $.asAjaxPost(sUrl, {}) + ")");
                var lessonCostPrice = "";
                $.each(retInfo, function(n, value) {
                    lessonCostPrice += value.LessonCostPrice;
                });
                rate = (ratePrice / lessonCostPrice) * 100;
                $("#Rate").val(rate);
            });