plupload简易应用 多图片上传显示预览以及删除

<script>
            var uploader = new plupload.Uploader({ //实例化一个plupload上传对象
                browse_button: 'btnBrowse',
                url: 'upload.ashx',
                flash_swf_url: 'Resource/scripts/js/Moxie.swf',
                silverlight_xap_url: 'Resource/scripts/js/Moxie.xap',
                filters: {
                    mime_types: [ //只允许上传图片文件
                      { title: "图片文件", extensions: "jpg,gif,png" }
                    ]
                }
            });
            uploader.init(); //初始化

            //绑定文件添加进队列事件
            uploader.bind('FilesAdded', function (uploader, files) {
                // alert(files[0].size);
                var msgFlg = 0;
                for (var i = 0, len = files.length; i < len; i++) {
                    if (files[i].size > 81920) {
                        uploader.files.splice(i, 1);
                        msgFlg = 1;
                    }
                    else {
                        !function (i) {
                            previewImage(files[i], function (imgsrc) {
                                $('#file-list').html($('#file-list').html() +
                                    '<div style="float:left" class="pic_list" id="' + files[i].id + '">'
                                    + ' (' + plupload.formatSize(files[i].size) +
                                    ')<a href="###" class="pic_delete" data-val=' + files[i].id +
                                    '>删除</a><br/>' +
                                '<img class="listview" width="90" height="60" src="' + imgsrc + '" name="' + files[i].name + '" /></div>');
                            })
                        }(i);
                    }
                }
                if (msgFlg == 1) {
                    alert("上传图片小于80K");
                }
            });

            $(document).on('click', '.pic_list a.pic_delete', function () {
                $(this).parent().remove();
                var toremove = '';
                var id = $(this).attr("data-val");
                for (var i in uploader.files) {
                    if (uploader.files[i].id === id) {
                        toremove = i;
                    }
                }
                uploader.files.splice(toremove, 1);
            });

            //所有都上传完成
            uploader.bind("UploadComplete", function (uploader, file) {
                alert("成功");
                $('#file-list').html("");
                exit();
            });
            function exit() {
                window.parent.location.href = window.parent.location.href;
            }
            //plupload中为我们提供了mOxie对象
            //有关mOxie的介绍和说明请看：https://github.com/moxiecode/moxie/wiki/API
            //如果你不想了解那么多的话，那就照抄本示例的代码来得到预览的图片吧
            function previewImage(file, callback) {//file为plupload事件监听函数参数中的file对象,callback为预览图片准备完成的回调函数
                if (!file || !/image\//.test(file.type)) return; //确保文件是图片
                if (file.type == 'image/gif') {//gif使用FileReader进行预览,因为mOxie.Image只支持jpg和png
                    var fr = new mOxie.FileReader();
                    fr.onload = function () {
                        callback(fr.result);
                        fr.destroy();
                        fr = null;
                    }
                    fr.readAsDataURL(file.getSource());
                } else {
                    var preloader = new mOxie.Image();
                    preloader.onload = function () {
                        //preloader.downsize(550, 400);//先压缩一下要预览的图片,宽300，高300
                        var imgsrc = preloader.type == 'image/jpeg' ? preloader.getAsDataURL('image/jpeg', 80) : preloader.getAsDataURL(); //得到图片src,实质为一个base64编码的数据
                        callback && callback(imgsrc); //callback传入的参数为预览图片的url
                        preloader.destroy();
                        preloader = null;
                    };
                    preloader.load(file.getSource());
                }
            }

            $("#update").bind('click', function () {
                if (uploader.files.length < 1) {
                    alert('请选择图片！');
                    return false;
                }
                uploader.start();
            })
        </script>

 public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            context.Response.Write("Hello World");
            UploadFile(context);
        }

        /// <summary>
        /// 上传图片
        /// </summary>
        /// <param name="context"></param>
        private void UploadFile(HttpContext context)
        {
            try
            {
                // 共通DB时间BLL
                BLL.GetTimeCommonBusiness comBll = new BLL.GetTimeCommonBusiness();

                context.Response.CacheControl = "no-cache";
                string s_rpath = "E:\\NewB2B\\04_源代码\\B2B.root\\B2B\\WEB\\upload\\resource";

                // 保存图片名做成
                ).Replace("-", "").Replace(":", "").Replace(" ", "").Replace("/", "").Replace(".", "");
                ,
                    context.Request[);
                // 图片上传
                )
                {
                    HttpPostedFile uploadFile = context.Request.Files[];
                    )
                    {
                        if (!Directory.Exists(s_rpath))
                        {
                            Directory.CreateDirectory(s_rpath);
                        }
                    }
                    uploadFile.SaveAs(string.Format("{0}\\{1}", s_rpath, name));
                }
                // 图片地址添加
                if (context.Session["SL0005EDIT$Photopath"] == null)
                {
                    ArrayList list = new ArrayList();
                    list.Add( name);
                    context.Session["SL0005EDIT$Photopath"] = list;
                }
                else
                {
                    ArrayList list = (ArrayList)context.Session["SL0005EDIT$Photopath"];
                    list.Add( name);
                    context.Session["SL0005EDIT$Photopath"] = list;
                }
            }
            catch (Exception)
            {
                throw;
            }
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }