jQuery以Post方式发送请求并获取返回的文件供下载！

try
        {
            string FileName = ".//doc//[大家网]Beginning.ASP.NET.2.0.E-Commerce.in.C#.2005.From.Novice.to.Professional[www.TopSage.com].pdf";
            FileName = ".//doc//Shipping+Advice+Spec++V1.4.xls";
            FullFileName = Server.MapPath(FileName); 
            //FileName--要下载的文件名 
            FileInfo DownloadFile = new FileInfo(FullFileName);
            if (DownloadFile.Exists)
            {
                Response.Clear();
                Response.ClearHeaders();
                Response.Buffer = false;
                Response.ContentType = "application/octet-stream";
                Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.ASCII));
                Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
                Response.WriteFile(DownloadFile.FullName);
                Response.Flush();
                Response.End();
            }
            else
            {
                //文件不存在
            }
        }
        catch
        {
           //打开时异常了
        }