<div class="widget-user-image">

            <img class="img-circle" id="appear" src="../../images/user.jpg" alt="User Avatar" >

        </div>

    <input type="file" id="fileupload" name="files" multiple>

    <button class=" btn btn-primary" id="Start">修改头像</button>

<script type="text/javascript">

    $('#fileupload').fileupload({

        url: "/Info/img",

        Type: "POST",

        dataType: 'json',

        autoUpload: true,

        acceptFileTypes: "/(\.|\/)(gif|jpe?g|png|xlsx)$/i",

        add: function (e, data) {

            $("#Start").click(function () {

                data.submit();

            })

            alert("已选择文件，可以更新头像！");

        },

        success: function (response, status) {

            var obj = JSON.parse(response);

            var imgPath = "../.." + obj["filePath"];

            //$("#imglist").append('<li><img src="' + imgPath + '" /> </li>');

            $('#appear').attr("src",imgPath);

        },

        done: function (e, data) {

            alert("update finish");

        },

        error: function (error) {

            alert("error");

        },

    });

</script>

 public JsonResult img(HttpPostedFileBase files)

        {

            try

            {

                string localPath = "/images";

                string path = Server.MapPath("~" + localPath);

                if (!Directory.Exists(path))

                {

                    Directory.CreateDirectory(path);

                }

                //TimeSpan ts = DateTime.Now - TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));

                //string fileName = (long)ts.TotalMilliseconds + Path.GetExtension(files.FileName);

                string fileName = files.FileName;

                files.SaveAs(path + "/" + fileName);

                return Json("{\"filePath\":\"" + localPath + "/" + fileName + "\",\"sourePath\":\"" + files.FileName + "\"}");

            }

            catch (Exception ex)

            {

                return null;

            }

        }