引用一下js：fileupload.js

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 function uploadImg1() {
                var f = document.getElementById('uploadFile1').files[0]
                var src = window.URL.createObjectURL(f);
                document.getElementById('uploadPreview1').src = src;

                //获取图片信息
                var f = document.getElementById('uploadFile1').files[0];
                if (!!f) {
                    learun.loading(true, '正在保存...');
                    $.ajaxFileUpload({
                        url: top.$.rootUrl + "/JSSS_imageUpload/JSSS_imageUpload/UploadFile",
                        secureuri: false,
                        fileElementId: 'uploadFile1',
                        dataType: 'json',
                        success: function (data) {
                            console.log(data)
                            $("#F_Photo1").val(data.data);
                            learun.loading(false);
                            if (data.code == 200) {
                                learun.alert.success('保存成功');
                            }
                        }
                    });
                }
            };

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 /// <summary>
        /// 上传头像
        /// </summary>
        /// <returns></returns>
        [HttpPost]
        public ActionResult UploadFile()
        {
            HttpFileCollection files = System.Web.HttpContext.Current.Request.Files;
            string ImageName = files[0].FileName;
            //没有文件上传，直接返回
            if (files[0].ContentLength == 0 || string.IsNullOrEmpty(files[0].FileName))
            {
                return HttpNotFound();
            }
            string dir = DateTime.Now.ToString("yyyyMMdd");
            if (!Directory.Exists(System.AppDomain.CurrentDomain.BaseDirectory + $@"Resource\{dir}"))
            {
                Directory.CreateDirectory(System.AppDomain.CurrentDomain.BaseDirectory + $@"Resource\{dir}");
            }
            string path = System.Web.HttpContext.Current.Request.PhysicalApplicationPath + $@"Resource\{dir}\" + ImageName;
            string imagennn = $@"\Resource\{dir}\" + ImageName;
            files[0].SaveAs(path);
            return JsonResult(imagennn);
        }

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