1.此文章是用原生JS来进行文件的上传，有两个版本，一个不用ajax，一个用ajax。

1）非AJAX

 

2）AJAX

 

2. 后台

public ActionResult UploadBusinessImage(HttpPostedFileBase ProductImage)        {            string error = "";            try            {                //文件上传                HttpPostedFileBase postFileBase = ProductImage;                //文件后缀                string extension = Path.GetExtension(postFileBase.FileName);                //文件流                Stream uploadStream = postFileBase.InputStream;                //把文件写入到本地E盘                using (var fileStream = System.IO.File.Create("E:\\" + postFileBase.FileName))                {                    uploadStream.Seek(0, SeekOrigin.Begin);                    uploadStream.CopyTo(fileStream);                }                return this.Json(error, JsonRequestBehavior.AllowGet);            }            catch (Exception e)            {                return this.Json(e.Message, JsonRequestBehavior.AllowGet);            }        }