CSDN没有高手了

function PageLoadImg(){   var imgObj = new Image();imgObj.src=$("ImgShow").src;if(imgObj.width>imgObj.height){var rw=imgObj.width;var rh=$("ImgShow").height;$("ImgShow").width=258;$("ImgShow").height=($("ImgShow").width/rw)*rh;}elseif(imgObj.width<imgObj.height){var rh=imgObj.height;var rw=$("ImgShow").width;$("ImgShow").height=258;$("ImgShow").width=($("ImgShow").height/rh)*rw;}else{var rw=imgObj.width;var rh=$("ImgShow").height;$("ImgShow").width=258;$("ImgShow").height=($("ImgShow").width/rw)*rh;}}
------解决方案--------------------------------------------------------
cs里面等比例缩放：
C# code
            string pic = context.Request["pic"];            int W = 100;            int H = 100;            try            {                 W = int.Parse(context.Request["W"]);                 H = int.Parse(context.Request["H"]);            }            catch            {                context.Response.End();            }            if(pic==null || pic=="" || W<=0 || H<=0 || pic.IndexOf(".")<1)            {                context.Response.End();            }                                    Bitmap bit = new Bitmap(System.Configuration.ConfigurationManager.AppSettings["UpLoadFile"] + pic.Replace("/upload/", "").Replace("/images/",""));            MemoryStream ms = new MemoryStream();            int newh = 0;            int neww = 0;            //            if (bit.Width < W && bit.Height < H)            {                newh = bit.Height;                neww = bit.Width;            }            else            {                double pwidth = (double)bit.Width / W;                double pheight = (double)bit.Height / H;                if (pwidth > pheight)                {                    neww = W;                    newh = Convert.ToInt32(bit.Height / pwidth);                }                else                {                    newh = H;                    neww = Convert.ToInt32(bit.Width / pheight);                }            }            //生成小图            Bitmap newbit = new Bitmap(bit, neww, newh);            newbit.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);            context.Response.ContentType = "image/jpeg";            context.Response.StatusCode = 200;            context.Response.BinaryWrite(ms.ToArray());