jquery.form.js实现无刷新上传图片。

首先引用jquery-1.3.2.min.js这个版本，其他版本不支持jquery.form.js

下载地址：http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js

引用jquery.form.js

;(function($) {
$.fn.ajaxSubmit = function(options) {

    if (!this.length) {
        log('ajaxSubmit: skipping submit process - no element selected');
        return this;
    }
    if (typeof options == 'function')
        options = { success: options };

    var url = $.trim(this.attr('action'));
    if (url) {
        // clean url (don't include hash vaue)
        url = (url.match(/^([^#]+)/)||[])[1];
       }
       url = url || window.location.href || '';

    options = $.extend({
        url:  url,
        type: this.attr('method') || 'GET',
        iframeSrc: /^https/i.test(window.location.href || '') ? 'javascript:false' : 'about:blank'
    }, options || {});

    // hook for manipulating the form data before it is extracted;
    // convenient for use with rich editors like tinyMCE or FCKEditor
    var veto = {};
    this.trigger('form-pre-serialize', [this, options, veto]);
    if (veto.veto) {
        log('ajaxSubmit: submit vetoed via form-pre-serialize trigger');
        return this;
    }

    // provide opportunity to alter form data before it is serialized
    if (options.beforeSerialize && options.beforeSerialize(this, options) === false) {
        log('ajaxSubmit: submit aborted via beforeSerialize callback');
        return this;
    }

    var a = this.formToArray(options.semantic);
    if (options.data) {
        options.extraData = options.data;
        for (var n in options.data) {
          if(options.data[n] instanceof Array) {
            for (var k in options.data[n])
              a.push( { name: n, value: options.data[n][k] } );
          }
          else
             a.push( { name: n, value: options.data[n] } );
        }
    }

    // give pre-submit callback an opportunity to abort the submit
    if (options.beforeSubmit && options.beforeSubmit(a, this, options) === false) {
        log('ajaxSubmit: submit aborted via beforeSubmit callback');
        return this;
    }

    // fire vetoable 'validate' event
    this.trigger('form-submit-validate', [a, this, options, veto]);
    if (veto.veto) {
        log('ajaxSubmit: submit vetoed via form-submit-validate trigger');
        return this;
    }

    var q = $.param(a);

    if (options.type.toUpperCase() == 'GET') {
        options.url += (options.url.indexOf('?') >= 0 ? '&' : '?') + q;
        options.data = null;  // data is null for 'get'
    }
    else
        options.data = q; // data is the query string for 'post'

    var $form = this, callbacks = [];
    if (options.resetForm) callbacks.push(function() { $form.resetForm(); });
    if (options.clearForm) callbacks.push(function() { $form.clearForm(); });

    // perform a load on the target only if dataType is not provided
    if (!options.dataType && options.target) {
        var oldSuccess = options.success || function(){};
        callbacks.push(function(data) {
            $(options.target).html(data).each(oldSuccess, arguments);
        });
    }
    else if (options.success)
        callbacks.push(options.success);

    options.success = function(data, status) {
        for (var i=0, max=callbacks.length; i < max; i++)
            callbacks[i].apply(options, [data, status, $form]);
    };

    // are there files to upload?
    var files = $('input:file', this).fieldValue();
    var found = false;
    for (var j=0; j < files.length; j++)
        if (files[j])
            found = true; 
    var multipart = false; 
   if ((files.length && options.iframe !== false) || options.iframe || found || multipart) { 
       if (options.closeKeepAlive)
           $.get(options.closeKeepAlive, fileUpload);
       else
           fileUpload();
       }
   else
       $.ajax(options); 
    this.trigger('form-submit-notify', [this, options]);
    return this; 
    function fileUpload() {
        var form = $form[0];

        if ($(':input[name=submit]', form).length) {
            alert('Error: Form elements must not be named "submit".');
            return;
        }

        var opts = $.extend({}, $.ajaxSettings, options);
        var s = $.extend(true, {}, $.extend(true, {}, $.ajaxSettings), opts);

        var id = 'jqFormIO' + (new Date().getTime());
        var $io = $('<iframe id="' + id + '" name="' + id + '" src="'+ opts.iframeSrc +'" />');
        var io = $io[0];

        $io.css({ position: 'absolute', top: '-1000px', left: '-1000px' });

        var xhr = { // mock object
            aborted: 0,
            responseText: null,
            responseXML: null,
            status: 0,
            statusText: 'n/a',
            getAllResponseHeaders: function() {},
            getResponseHeader: function() {},
            setRequestHeader: function() {},
            abort: function() {
                this.aborted = 1;
                $io.attr('src', opts.iframeSrc); // abort op in progress
            }
        };

        var g = opts.global;
        // trigger ajax global events so that activity/block indicators work like normal
        if (g && ! $.active++) $.event.trigger("ajaxStart");
        if (g) $.event.trigger("ajaxSend", [xhr, opts]);

        if (s.beforeSend && s.beforeSend(xhr, s) === false) {
            s.global && $.active--;
            return;
        }
        if (xhr.aborted)
            return;

        var cbInvoked = 0;
        var timedOut = 0;

        // add submitting element to data if we know it
        var sub = form.clk;
        if (sub) {
            var n = sub.name;
            if (n && !sub.disabled) {
                options.extraData = options.extraData || {};
                options.extraData[n] = sub.value;
                if (sub.type == "image") {
                    options.extraData[name+'.x'] = form.clk_x;
                    options.extraData[name+'.y'] = form.clk_y;
                }
            }
        }

        // take a breath so that pending repaints get some cpu time before the upload starts
        setTimeout(function() {
            // make sure form attrs are set
            var t = $form.attr('target'), a = $form.attr('action');

            // update form attrs in IE friendly way
            form.setAttribute('target',id);
            if (form.getAttribute('method') != 'POST')
                form.setAttribute('method', 'POST');
            if (form.getAttribute('action') != opts.url)
                form.setAttribute('action', opts.url);

            // ie borks in some cases when setting encoding
            if (! options.skipEncodingOverride) {
                $form.attr({
                    encoding: 'multipart/form-data',
                    enctype:  'multipart/form-data'
                });
            }

            // support timout
            if (opts.timeout)
                setTimeout(function() { timedOut = true; cb(); }, opts.timeout);

            // add "extra" data to form if provided in options
            var extraInputs = [];
            try {
                if (options.extraData)
                    for (var n in options.extraData)
                        extraInputs.push(
                            $('<input type="hidden" name="'+n+'" value="'+options.extraData[n]+'" />')
                                .appendTo(form)[0]);

                // add iframe to doc and submit the form
                $io.appendTo('body');
                io.attachEvent ? io.attachEvent('onload', cb) : io.addEventListener('load', cb, false);
                form.submit();
            }
            finally {
                // reset attrs and remove "extra" input elements
                form.setAttribute('action',a);
                t ? form.setAttribute('target', t) : $form.removeAttr('target');
                $(extraInputs).remove();
            }
        }, 10);

        var domCheckCount = 50;

        function cb() {
            if (cbInvoked++) return;

            io.detachEvent ? io.detachEvent('onload', cb) : io.removeEventListener('load', cb, false);

            var ok = true;
            try {
                if (timedOut) throw 'timeout';
                // extract the server response from the iframe
                var data, doc;

                doc = io.contentWindow ? io.contentWindow.document : io.contentDocument ? io.contentDocument : io.document;
                
                var isXml = opts.dataType == 'xml' || doc.XMLDocument || $.isXMLDoc(doc);
                log('isXml='+isXml);
                if (!isXml && (doc.body == null || doc.body.innerHTML == '')) {
                     if (--domCheckCount) {
                        // in some browsers (Opera) the iframe DOM is not always traversable when
                        // the onload callback fires, so we loop a bit to accommodate
                        cbInvoked = 0;
                        setTimeout(cb, 100);
                        return;
                    }
                    log('Could not access iframe DOM after 50 tries.');
                    return;
                }

                xhr.responseText = doc.body ? doc.body.innerHTML : null;
                xhr.responseXML = doc.XMLDocument ? doc.XMLDocument : doc;
                xhr.getResponseHeader = function(header){
                    var headers = {'content-type': opts.dataType};
                    return headers[header];
                };

                if (opts.dataType == 'json' || opts.dataType == 'script') {
                    // see if user embedded response in textarea
                    var ta = doc.getElementsByTagName('textarea')[0];
                    if (ta)
                        xhr.responseText = ta.value;
                    else {
                        // account for browsers injecting pre around json response
                        var pre = doc.getElementsByTagName('pre')[0];
                        if (pre)
                            xhr.responseText = pre.innerHTML;
                    }              
                }
                else if (opts.dataType == 'xml' && !xhr.responseXML && xhr.responseText != null) {
                    xhr.responseXML = toXml(xhr.responseText);
                }
                data = $.httpData(xhr, opts.dataType);
            }
            catch(e){
                ok = false;
                $.handleError(opts, xhr, 'error', e);
            }

            // ordering of these callbacks/triggers is odd, but that's how $.ajax does it
            if (ok) {
                opts.success(data, 'success');
                if (g) $.event.trigger("ajaxSuccess", [xhr, opts]);
            }
            if (g) $.event.trigger("ajaxComplete", [xhr, opts]);
            if (g && ! --$.active) $.event.trigger("ajaxStop");
            if (opts.complete) opts.complete(xhr, ok ? 'success' : 'error');

            // clean up
            setTimeout(function() {
                $io.remove();
                xhr.responseXML = null;
            }, 100);
        };

        function toXml(s, doc) {
            if (window.ActiveXObject) {
                doc = new ActiveXObject('Microsoft.XMLDOM');
                doc.async = 'false';
                doc.loadXML(s);
            }
            else
                doc = (new DOMParser()).parseFromString(s, 'text/xml');
            return (doc && doc.documentElement && doc.documentElement.tagName != 'parsererror') ? doc : null;
        };
    };
};

$.fn.ajaxForm = function(options) {
    return this.ajaxFormUnbind().bind('submit.form-plugin', function() {
        $(this).ajaxSubmit(options);
        return false;
    }).bind('click.form-plugin', function(e) {
        var target = e.target;
        var $el = $(target);
        if (!($el.is(":submit,input:image"))) {
            // is this a child element of the submit el?  (ex: a span within a button)
            var t = $el.closest(':submit');
            if (t.length == 0)
                return;
            target = t[0];
        }
        var form = this;
        form.clk = target;
        if (target.type == 'image') {
            if (e.offsetX != undefined) {
                form.clk_x = e.offsetX;
                form.clk_y = e.offsetY;
            } else if (typeof $.fn.offset == 'function') { // try to use dimensions plugin
                var offset = $el.offset();
                form.clk_x = e.pageX - offset.left;
                form.clk_y = e.pageY - offset.top;
            } else {
                form.clk_x = e.pageX - target.offsetLeft;
                form.clk_y = e.pageY - target.offsetTop;
            }
        }
        // clear form vars
        setTimeout(function() { form.clk = form.clk_x = form.clk_y = null; }, 100);
    });
};

// ajaxFormUnbind unbinds the event handlers that were bound by ajaxForm
$.fn.ajaxFormUnbind = function() {
    return this.unbind('submit.form-plugin click.form-plugin');
};

/**
 * formToArray() gathers form element data into an array of objects that can
 * be passed to any of the following ajax functions: $.get, $.post, or load.
 * Each object in the array has both a 'name' and 'value' property.  An example of
 * an array for a simple login form might be:
 *
 * [ { name: 'username', value: 'jresig' }, { name: 'password', value: 'secret' } ]
 *
 * It is this array that is passed to pre-submit callback functions provided to the
 * ajaxSubmit() and ajaxForm() methods.
 */
$.fn.formToArray = function(semantic) {
    var a = [];
    if (this.length == 0) return a;

    var form = this[0];
    var els = semantic ? form.getElementsByTagName('*') : form.elements;
    if (!els) return a;
    for(var i=0, max=els.length; i < max; i++) {
        var el = els[i];
        var n = el.name;
        if (!n) continue;

        if (semantic && form.clk && el.type == "image") {
            // handle image inputs on the fly when semantic == true
            if(!el.disabled && form.clk == el) {
                a.push({name: n, value: $(el).val()});
                a.push({name: n+'.x', value: form.clk_x}, {name: n+'.y', value: form.clk_y});
            }
            continue;
        }

        var v = $.fieldValue(el, true);
        if (v && v.constructor == Array) {
            for(var j=0, jmax=v.length; j < jmax; j++)
                a.push({name: n, value: v[j]});
        }
        else if (v !== null && typeof v != 'undefined')
            a.push({name: n, value: v});
    }

    if (!semantic && form.clk) {
        // input type=='image' are not found in elements array! handle it here
        var $input = $(form.clk), input = $input[0], n = input.name;
        if (n && !input.disabled && input.type == 'image') {
            a.push({name: n, value: $input.val()});
            a.push({name: n+'.x', value: form.clk_x}, {name: n+'.y', value: form.clk_y});
        }
    }
    return a;
};

/**
 * Serializes form data into a 'submittable' string. This method will return a string
 * in the format: name1=value1&amp;name2=value2
 */
$.fn.formSerialize = function(semantic) {
    //hand off to jQuery.param for proper encoding
    return $.param(this.formToArray(semantic));
};

/**
 * Serializes all field elements in the jQuery object into a query string.
 * This method will return a string in the format: name1=value1&amp;name2=value2
 */
$.fn.fieldSerialize = function(successful) {
    var a = [];
    this.each(function() {
        var n = this.name;
        if (!n) return;
        var v = $.fieldValue(this, successful);
        if (v && v.constructor == Array) {
            for (var i=0,max=v.length; i < max; i++)
                a.push({name: n, value: v[i]});
        }
        else if (v !== null && typeof v != 'undefined')
            a.push({name: this.name, value: v});
    });
    //hand off to jQuery.param for proper encoding
    return $.param(a);
};

/**
 * Returns the value(s) of the element in the matched set.  For example, consider the following form:
 *
 *  <form><fieldset>
 *      <input name="A" type="text" />
 *      <input name="A" type="text" />
 *      <input name="B" type="checkbox" value="B1" />
 *      <input name="B" type="checkbox" value="B2"/>
 *      <input name="C" type="radio" value="C1" />
 *      <input name="C" type="radio" value="C2" />
 *  </fieldset></form>
 *
 *  var v = $(':text').fieldValue();
 *  // if no values are entered into the text inputs
 *  v == ['','']
 *  // if values entered into the text inputs are 'foo' and 'bar'
 *  v == ['foo','bar']
 *
 *  var v = $(':checkbox').fieldValue();
 *  // if neither checkbox is checked
 *  v === undefined
 *  // if both checkboxes are checked
 *  v == ['B1', 'B2']
 *
 *  var v = $(':radio').fieldValue();
 *  // if neither radio is checked
 *  v === undefined
 *  // if first radio is checked
 *  v == ['C1']
 *
 * The successful argument controls whether or not the field element must be 'successful'
 * (per http://www.w3.org/TR/html4/interact/forms.html#successful-controls).
 * The default value of the successful argument is true.  If this value is false the value(s)
 * for each element is returned.
 *
 * Note: This method *always* returns an array.  If no valid value can be determined the
 *       array will be empty, otherwise it will contain one or more values.
 */
$.fn.fieldValue = function(successful) {
    for (var val=[], i=0, max=this.length; i < max; i++) {
        var el = this[i];
        var v = $.fieldValue(el, successful);
        if (v === null || typeof v == 'undefined' || (v.constructor == Array && !v.length))
            continue;
        v.constructor == Array ? $.merge(val, v) : val.push(v);
    }
    return val;
};

/**
 * Returns the value of the field element.
 */
$.fieldValue = function(el, successful) {
    var n = el.name, t = el.type, tag = el.tagName.toLowerCase();
    if (typeof successful == 'undefined') successful = true;

    if (successful && (!n || el.disabled || t == 'reset' || t == 'button' ||
        (t == 'checkbox' || t == 'radio') && !el.checked ||
        (t == 'submit' || t == 'image') && el.form && el.form.clk != el ||
        tag == 'select' && el.selectedIndex == -1))
            return null;

    if (tag == 'select') {
        var index = el.selectedIndex;
        if (index < 0) return null;
        var a = [], ops = el.options;
        var one = (t == 'select-one');
        var max = (one ? index+1 : ops.length);
        for(var i=(one ? index : 0); i < max; i++) {
            var op = ops[i];
            if (op.selected) {
                var v = op.value;
                if (!v) // extra pain for IE...
                    v = (op.attributes && op.attributes['value'] && !(op.attributes['value'].specified)) ? op.text : op.value;
                if (one) return v;
                a.push(v);
            }
        }
        return a;
    }
    return el.value;
};

/**
 * Clears the form data.  Takes the following actions on the form's input fields:
 *  - input text fields will have their 'value' property set to the empty string
 *  - select elements will have their 'selectedIndex' property set to -1
 *  - checkbox and radio inputs will have their 'checked' property set to false
 *  - inputs of type submit, button, reset, and hidden will *not* be effected
 *  - button elements will *not* be effected
 */
$.fn.clearForm = function() {
    return this.each(function() {
        $('input,select,textarea', this).clearFields();
    });
};

/**
 * Clears the selected form elements.
 */
$.fn.clearFields = $.fn.clearInputs = function() {
    return this.each(function() {
        var t = this.type, tag = this.tagName.toLowerCase();
        if (t == 'text' || t == 'password' || tag == 'textarea')
            this.value = '';
        else if (t == 'checkbox' || t == 'radio')
            this.checked = false;
        else if (tag == 'select')
            this.selectedIndex = -1;
    });
};

/**
 * Resets the form data.  Causes all form elements to be reset to their original value.
 */
$.fn.resetForm = function() {
    return this.each(function() {
        // guard against an input with the name of 'reset'
        // note that IE reports the reset function as an 'object'
        if (typeof this.reset == 'function' || (typeof this.reset == 'object' && !this.reset.nodeType))
            this.reset();
    });
};

/**
 * Enables or disables any matching elements.
 */
$.fn.enable = function(b) {
    if (b == undefined) b = true;
    return this.each(function() {
        this.disabled = !b;
    });
};

/**
 * Checks/unchecks any matching checkboxes or radio buttons and
 * selects/deselects and matching option elements.
 */
$.fn.selected = function(select) {
    if (select == undefined) select = true;
    return this.each(function() {
        var t = this.type;
        if (t == 'checkbox' || t == 'radio')
            this.checked = select;
        else if (this.tagName.toLowerCase() == 'option') {
            var $sel = $(this).parent('select');
            if (select && $sel[0] && $sel[0].type == 'select-one') {
                // deselect all other options
                $sel.find('option').selected(false);
            }
            this.selected = select;
        }
    });
};

// helper fn for console logging
// set $.fn.ajaxSubmit.debug to true to enable debug logging
function log() {
    if ($.fn.ajaxSubmit.debug && window.console && window.console.log)
        window.console.log('[jquery.form] ' + Array.prototype.join.call(arguments,''));
};

})(jQuery);

页面调用：

 <script type="text/javascript" src="/scripts/jquery/jquery-1.3.2.min.js"></script>
 <script type="text/javascript" src="/scripts/jquery/jquery.form.js"></script>

//================上传文件JS函数开始，需和jquery.form.js一起使用===============
//文件上传
function Upload(action, repath, uppath, iswater, isthumbnail, filepath) {
    var sendUrl = upload_ajax.ashx?action=" + action + "&ReFilePath=" + repath + "&UpFilePath=" + uppath;
    //开始提交
    $("#aspnetForm").ajaxSubmit({
        beforeSubmit: function (formData, jqForm, options) {
            //隐藏上传按钮
            $("#" + repath).nextAll(".files").eq(0).hide();
            //显示LOADING图片
            $("#" + repath).nextAll(".uploading").eq(0).show();
        },
        success: function (data, textStatus) {
            if (data.msg == 1) {
                $("#" + repath).val(data.msbox);
                $('#prev_img_1').attr('src', data.msbox);
            } else {
                alert(data.msbox);
            }
            $("#" + repath).nextAll(".files").eq(0).show();
            $("#" + repath).nextAll(".uploading").eq(0).hide();
        },
        error: function (data, status, e) {
            alert("上传失败，错误信息：" + e);
            $("#" + repath).nextAll(".files").eq(0).show();
            $("#" + repath).nextAll(".uploading").eq(0).hide();
        },
        url: sendUrl,
        type: "post",
        dataType: "json",
        timeout: 600000
    });
};

页面html代码：

 <style type="text/css">
    /*file容器样式*/
    a.files{ margin:0 auto; float:left; 85px; height:25px;color:#000000; line-height:24px; overflow:hidden; display:block; background:url(../images/hyzxBg3.gif) 0px -355px;text-decoration:none;maigin:0px 0px 0px 15px; }
    /*file设为透明，并覆盖整个触发面*/
    a.files input{ margin-left:-300px; height:25px; font-size:25px; cursor:pointer; filter:alpha(opacity=0); opacity:0; }
</style>

             <div class="grzlImg left">
                      <asp:HiddenField ID="himg" runat="server" />
                      <img id="prev_img_1"  width="107" height="107" src="<%=touxiang %>"/>
             </div>
             <div class="grzlHuantu right">   
                   <a href="javascript:;" class="files"><input type="file" id="FileUpload" name="FileUpload" onchange="Upload('SingleFile', '<%=himg.ClientID %>', 'FileUpload');" /></a>
             </div>

upload_ajax.ashx处理文件代码：

 public void ProcessRequest(HttpContext context)
        {
            //取得处事类型
            string action = DTRequest.GetQueryString("action");
            switch (action)
            {
                case "SingleFile": //单文件
                    SingleFile(context);
                    break;
             }
        }
 #region 上传单文件处理===================================
        private void SingleFile(HttpContext context)
        {
            string _refilepath = context.Request.QueryString["ReFilePath"]; //取得返回的对象名称
            string _upfilepath = context.Request.QueryString["UpFilePath"]; //取得上传的对象名称
            string _delfile = context.Request.Params[_refilepath];
            HttpPostedFile _upfile = context.Request.Files[_upfilepath];
            bool _iswater = false; //默认不打水印
            bool _isthumbnail = false; //默认不生成缩略图

            if (context.Request.QueryString["IsWater"] == "1")
                _iswater = true;
            if (context.Request.QueryString["IsThumbnail"] == "1")
                _isthumbnail = true;

            if (_upfile == null)
            {
                context.Response.Write("{msg: 0, msbox: \"请选择要上传文件！\"}");
                return;
            }
            UpLoad upFiles = new UpLoad();
            string msg = upFiles.fileSaveAs(_upfile, _isthumbnail, _iswater); 
            ////删除已存在的旧文件
            //Utils.DeleteUpFile(_delfile);
            //返回成功信息
            context.Response.Write(msg);

            context.Response.End();
        }
        #endregion
 /// <summary>
        /// 文件上传方法A
        /// </summary>
        /// <param name="postedFile">文件流</param>
        /// <param name="isThumbnail">是否生成缩略图</param>
        /// <param name="isWater">是否打水印</param>
        /// <returns>服务器文件路径</returns>
        public string fileSaveAs(HttpPostedFile postedFile, bool isThumbnail, bool isWater)
        {
            return fileSaveAs(postedFile, isThumbnail, isWater, false);
        }
/// <summary>
        /// 文件上传方法B
        /// </summary>
        /// <param name="postedFile">文件流</param>
        /// <param name="isThumbnail">是否生成缩略图</param>
        /// <param name="isWater">是否打水印</param>
        /// <param name="isWater">是否返回文件原名称</param>
        /// <returns>服务器文件路径</returns>
        public string fileSaveAs(HttpPostedFile postedFile, bool isThumbnail, bool isWater, bool _isReOriginal)
        {
            try
            {
                string fileExt = postedFile.FileName.Substring(postedFile.FileName.LastIndexOf(".") + 1); //文件扩展名，不含“.”
                string originalFileName = postedFile.FileName.Substring(postedFile.FileName.LastIndexOf(@"\") + 1); //取得文件原名
                string fileName = Utils.GetRamCode() + "." + fileExt; //随机文件名
                string dirPath = GetUpLoadPath(); //上传目录相对路径

                //检查文件扩展名是否合法
                if (!CheckFileExt(fileExt))
                {
                    return "{msg: 0, msbox: \"不允许上传" + fileExt + "类型的文件！\"}";
                }
                //检查文件大小是否合法
                if(!CheckFileSize(fileExt, postedFile.ContentLength))
                {
                    return "{msg: 0, msbox: \"文件超过限制的大小啦！\"}";
                }
                //获得要保存的文件路径
                string serverFileName = dirPath + fileName; 
                string returnFileName = serverFileName;
                //物理完整路径                    
                string toFileFullPath = Utils.GetMapPath(dirPath);
                //检查有该路径是否就创建
                if (!Directory.Exists(toFileFullPath))
                {
                    Directory.CreateDirectory(toFileFullPath);
                } 
                //保存文件
                postedFile.SaveAs(toFileFullPath + fileName); 
                //如果需要返回原文件名
                if (_isReOriginal)
                {
                    return "{msg: 1, msbox: \"" + serverFileName + "\", mstitle: \"" + originalFileName + "\"}";
                }
                 
                return "{msg: 1, msbox: \"" + returnFileName + "\"}";
            }
            catch
            {
                return "{msg: 0, msbox: \"上传过程中发生意外错误！\"}";
            }
        }
 /// <summary>
        /// 返回上传目录相对路径
        /// </summary>
        /// <param name="fileName">上传文件名</param>
        private string GetUpLoadPath()
        {
            string path = "/upfiles/";
            //string path = siteConfig.webpath + siteConfig.attachpath + "/"; //站点目录+上传目录
            switch (this.siteConfig.attachsave)
            {
                case 1: //按年月日每天一个文件夹
                    path += DateTime.Now.ToString("yyyyMMdd");
                    break;
                default: //按年月/日存入不同的文件夹
                    path += DateTime.Now.ToString("yyyyMM");
                    break;
            }
            return path + "/";
        }