ajax+webapi上传图片问题

自己想写一个原生的JS的图片上传，不想一直只是使用上传文件的框架

网上有很多jquery上传图片上传文件的插件，但是要不是用特定的后台框架接收，要不就是只能上传图片，不是文件，还有一些其他的问题，所以我才想自己玩玩JS原生态的上传文件

文件倒是能保存到服务器上，但是貌似因为返回头文件问题，文件保存成功了，就是JS还是有一条警告，但是不飘红，也请大神指点

 

先上C#代码吧，用的webapi

[HttpPost]
        public async Task<HttpResponseMessage> Post()
        {
            // Check whether the POST operation is MultiPart?
            if (!Request.Content.IsMimeMultipartContent())
            {
                throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
            }

            // Prepare CustomMultipartFormDataStreamProvider in which our multipart form
            // data will be loaded.
            string fileSaveLocation = HttpContext.Current.Server.MapPath("~/file");
            CustomMultipartFormDataStreamProvider provider = new CustomMultipartFormDataStreamProvider(fileSaveLocation);
            List<string> files = new List<string>();

            try
            {
                // Read all contents of multipart message into CustomMultipartFormDataStreamProvider.
                await Request.Content.ReadAsMultipartAsync(provider);

                foreach (MultipartFileData file in provider.FileData)
                {
                    files.Add(Path.GetFileName(file.LocalFileName));
                }

                // Send OK Response along with saved file names to the client.
                return Request.CreateResponse(HttpStatusCode.OK, files);
            }
            catch (System.Exception e)
            {
                return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, e);
            }
        }


        // We implement MultipartFormDataStreamProvider to override the filename of File which
        // will be stored on server, or else the default name will be of the format like Body-
        // Part_{GUID}. In the following implementation we simply get the FileName from 
        // ContentDisposition Header of the Request Body.
        public class CustomMultipartFormDataStreamProvider : MultipartFormDataStreamProvider
        {
            public CustomMultipartFormDataStreamProvider(string path) : base(path) { }

            public override string GetLocalFileName(HttpContentHeaders headers)
            {
                return headers.ContentDisposition.FileName.Replace("\"", string.Empty);
            }
        }

View Code