基于jQuery Ajax实现上传文件

//保存function btnAdd() { var formData = new FormData($("#frm")[0]); $.ajax({  url: "/Admin/ContentManage/SaveEdit",  type: "POST",  data: formData,  contentType: false, //必须false才会避开jQuery对 formdata 的默认处理 XMLHttpRequest会对 formdata 进行正确的处理   processData: false, //必须false才会自动加上正确的Content-Type  success: function (data) {   if (data == "OK") {    alert("保存成功");    $.iDialog("close"); //刷新父页面   }   else {    alert("保存失败：" + data);   }  } });}

//首先判断路径是否存在,不存在则创建路径string path = Path.Combine(System.Configuration.ConfigurationManager.AppSettings["UploadsFiles"], folder + "/" + DateTime.Now.ToString("yyyyMMdd") + "/");string physicalPath = server.MapPath(path);if (!Directory.Exists(physicalPath)){ Directory.CreateDirectory(physicalPath);}HttpPostedFileBase file = request.Files[0];string newFileName = Guid.NewGuid().ToString().Replace("-", "") + Path.GetExtension(file.FileName);string savePath = Path.Combine(physicalPath, newFileName);file.SaveAs(savePath);fileName = file.FileName;string url = Path.Combine(path, newFileName);return url;