上传文件是常要处理的事情，使用ajaxFileUpload.js处理比较方便，这里的ajaxFileUpload.js文件修改过的，

Html部分

                         <input type="file" id="fu_UploadFile" name="fu_UploadFile" value="" title="上传附件">

                         <input type="button" value="上传" onclick="upload()" />

JS部分：

        function upload() {

            var path = document.getElementById("fu_UploadFile").value;

            if ($.trim(path) == "") { alert("请选择要上传的文件"); return; }

            console.log("test");
        </span><span style="color: #0000ff;">var</span> result_msg = ""<span style="color: #000000;">;

        $.ajaxFileUpload({

            url: </span>'/UpFile.ashx',  <span style="color: #008000;">//</span><span style="color: #008000;">这里是服务器处理的代码</span>

            type: 'post'<span style="color: #000000;">,

            secureuri: </span><span style="color: #0000ff;">false</span>, <span style="color: #008000;">//</span><span style="color: #008000;">一般设置为false</span>

            fileElementId: 'fu_UploadFile', <span style="color: #008000;">//</span><span style="color: #008000;"> 上传文件的id、name属性名</span>

            dataType: 'json', <span style="color: #008000;">//</span><span style="color: #008000;">返回值类型，一般设置为json、application/json</span>

            data: {}, <span style="color: #008000;">//</span><span style="color: #008000;">传递参数到服务器</span>

            success: <span style="color: #0000ff;">function</span><span style="color: #000000;"> (data, status) {

                    </span><span style="color: #0000ff;">if</span><span style="color: #000000;"> (data.Result) {

                        alert(</span>"文件成功处理完成!" +<span style="color: #000000;"> data.FileName);

                    } </span><span style="color: #0000ff;">else</span><span style="color: #000000;"> {

                        alert(</span>"文件成功处理出错！原因：" +<span style="color: #000000;"> data.ErrorMessage);

                    }

            },

            error: </span><span style="color: #0000ff;">function</span><span style="color: #000000;"> (data, status, e) {

                alert(</span>"错误：上传组件错误，请检察网络!"<span style="color: #000000;">);

            }

        });

    }</span></pre>

　　服务器：

    /// <summary>

    /// UpFile 的摘要说明

    /// </summary>

    public class UpFile : IHttpHandler

    {
    </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> ProcessRequest(HttpContext context)

    {

        context.Response.ContentType </span>= <span style="color: #800000;">"</span><span style="color: #800000;">text/plain</span><span style="color: #800000;">"</span><span style="color: #000000;">;

        UpFileResult result </span>= <span style="color: #0000ff;">new</span><span style="color: #000000;"> UpFileResult();

        </span><span style="color: #0000ff;">try</span><span style="color: #000000;">

        {

            HttpPostedFile _upfile </span>= context.Request.Files[<span style="color: #800000;">"</span><span style="color: #800000;">fu_UploadFile</span><span style="color: #800000;">"</span><span style="color: #000000;">];

        </span><span style="color: #0000ff;">if</span> (_upfile == <span style="color: #0000ff;">null</span><span style="color: #000000;">)

        {

            </span><span style="color: #0000ff;">throw</span> <span style="color: #0000ff;">new</span> Exception(<span style="color: #800000;">"</span><span style="color: #800000;">请先选择文件！</span><span style="color: #800000;">"</span><span style="color: #000000;">);

        }

        </span><span style="color: #0000ff;">else</span><span style="color: #000000;">

        {

            </span><span style="color: #0000ff;">string</span> fileName = _upfile.FileName;<span style="color: #008000;">/*</span><span style="color: #008000;">获取文件名： C:\Documents and Settings\Administrator\桌面\123.jpg</span><span style="color: #008000;">*/</span>

            <span style="color: #0000ff;">string</span> suffix = fileName.Substring(fileName.LastIndexOf(<span style="color: #800000;">"</span><span style="color: #800000;">.</span><span style="color: #800000;">"</span>) + <span style="color: #800080;">1</span>).ToLower();<span style="color: #008000;">/*</span><span style="color: #008000;">获取后缀名并转为小写： jpg</span><span style="color: #008000;">*/</span>

            <span style="color: #0000ff;">int</span> bytes = _upfile.ContentLength;<span style="color: #008000;">//</span><span style="color: #008000;">获取文件的字节大小

            </span><span style="color: #008000;">//


if (!(suffix == "jpg" || suffix == "gif" || suffix == "png"|| suffix == "jpeg"))


throw new Exception("只能上传JPE，GIF,PNG文件");


if (bytes >  * *)


throw new Exception("文件最大只能传10M");


string newfileName = DateTime.Now.ToString("yyyyMMddHHmmss");


string fileDir = HttpContext.Current.Server.MapPath("~/upfiles/");


if (!Directory.Exists(fileDir))


{


Directory.CreateDirectory(fileDir);


}


result.FileName = fileName;

　　　　　　　　　　　　string saveDir = fileDir + newfileName + "." + suffix;
　　　　　　　　　　　　result.FileURL = "~/upfiles/" + newfileName + "." + suffix;

                _upfile.SaveAs(result.FileURL);//保存图片  

            }

            }

            catch (System.Exception ex)

            {

                result.Result = false;

                result.ErrorMessage = ex.Message;

            }

            context.Response.Write(JsonHelper.SerializeObject(result));
    }

    </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">bool</span><span style="color: #000000;"> IsReusable

    {

        </span><span style="color: #0000ff;">get</span><span style="color: #000000;">

        {

            </span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">false</span><span style="color: #000000;">;

        }

    }

    </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">class</span> UpFileResult   <span style="color: #008000;">//</span><span style="color: #008000;">: AshxCommonResult</span>


{


public bool Result { get; set; }


public string ErrorMessage { get; set; }


public string FileName { get; set; }


public string FileURL { get; set; }


}

ajaxfileupload.js

jQuery.extend({
handleError: </span><span style="color: #0000ff;">function</span><span style="color: #000000;"> (s, xhr, status, e) {

    </span><span style="color: #008000;">//</span><span style="color: #008000;"> If a local callback was specified, fire it</span>

    <span style="color: #0000ff;">if</span><span style="color: #000000;"> (s.error) {

        s.error.call(s.context </span>||<span style="color: #000000;"> s, xhr, status, e);

    }

    </span><span style="color: #008000;">//</span><span style="color: #008000;"> Fire the global callback</span>

    <span style="color: #0000ff;">if</span><span style="color: #000000;"> (s.global) {

        (s.context </span>? jQuery(s.context) : jQuery.event).trigger("ajaxError"<span style="color: #000000;">, [xhr, s, e]);

    }

},

createUploadIframe: </span><span style="color: #0000ff;">function</span><span style="color: #000000;">(id, uri)

{

        </span><span style="color: #008000;">//</span><span style="color: #008000;">create frame</span>

        <span style="color: #0000ff;">var</span> frameId = 'jUploadFrame' +<span style="color: #000000;"> id;

        </span><span style="color: #0000ff;">var</span> iframeHtml = '&lt;iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"'<span style="color: #000000;">;

        </span><span style="color: #0000ff;">if</span><span style="color: #000000;">(window.ActiveXObject)

        {

            </span><span style="color: #0000ff;">if</span>(<span style="color: #0000ff;">typeof</span> uri== 'boolean'<span style="color: #000000;">){

                iframeHtml </span>+= ' src="' + 'javascript:false' + '"'<span style="color: #000000;">;

            }

            </span><span style="color: #0000ff;">else</span> <span style="color: #0000ff;">if</span>(<span style="color: #0000ff;">typeof</span> uri== 'string'<span style="color: #000000;">){

                iframeHtml </span>+= ' src="' + uri + '"'<span style="color: #000000;">;

            }

        }

        iframeHtml </span>+= ' /&gt;'<span style="color: #000000;">;

        jQuery(iframeHtml).appendTo(document.body);

        </span><span style="color: #0000ff;">return</span> jQuery('#' + frameId).get(0<span style="color: #000000;">);

},

createUploadForm: </span><span style="color: #0000ff;">function</span><span style="color: #000000;">(id, fileElementId, data)

{

    </span><span style="color: #008000;">//</span><span style="color: #008000;">create form    </span>

    <span style="color: #0000ff;">var</span> formId = 'jUploadForm' +<span style="color: #000000;"> id;

    </span><span style="color: #0000ff;">var</span> fileId = 'jUploadFile' +<span style="color: #000000;"> id;

    </span><span style="color: #0000ff;">var</span> form = jQuery('&lt;form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"&gt;&lt;/form&gt;'<span style="color: #000000;">);

    </span><span style="color: #0000ff;">if</span><span style="color: #000000;">(data)

    {

        </span><span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">var</span> i <span style="color: #0000ff;">in</span><span style="color: #000000;"> data)

        {

            jQuery(</span>'&lt;input type="hidden" name="' + i + '" value="' + data[i] + '" /&gt;'<span style="color: #000000;">).appendTo(form);

        }

    }

    </span><span style="color: #0000ff;">var</span> oldElement = jQuery('#' +<span style="color: #000000;"> fileElementId);

    </span><span style="color: #0000ff;">var</span> newElement =<span style="color: #000000;"> jQuery(oldElement).clone();

    jQuery(oldElement).attr(</span>'id'<span style="color: #000000;">, fileId);

    jQuery(oldElement).before(newElement);

    jQuery(oldElement).appendTo(form);

    </span><span style="color: #008000;">//</span><span style="color: #008000;">set attributes</span>

    jQuery(form).css('position', 'absolute'<span style="color: #000000;">);

    jQuery(form).css(</span>'top', '-1200px'<span style="color: #000000;">);

    jQuery(form).css(</span>'left', '-1200px'<span style="color: #000000;">);

    jQuery(form).appendTo(</span>'body'<span style="color: #000000;">);

    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> form;

},

ajaxFileUpload: </span><span style="color: #0000ff;">function</span><span style="color: #000000;">(s) {

    </span><span style="color: #008000;">//</span><span style="color: #008000;"> TODO introduce global settings, allowing the client to modify them for all requests, not only timeout        </span>

    s =<span style="color: #000000;"> jQuery.extend({}, jQuery.ajaxSettings, s);

    </span><span style="color: #0000ff;">var</span> id = <span style="color: #0000ff;">new</span><span style="color: #000000;"> Date().getTime()

    </span><span style="color: #0000ff;">var</span> form = jQuery.createUploadForm(id, s.fileElementId, (<span style="color: #0000ff;">typeof</span>(s.data)=='undefined'?<span style="color: #0000ff;">false</span><span style="color: #000000;">:s.data));

    </span><span style="color: #0000ff;">var</span> io =<span style="color: #000000;"> jQuery.createUploadIframe(id, s.secureuri);

    </span><span style="color: #0000ff;">var</span> frameId = 'jUploadFrame' +<span style="color: #000000;"> id;

    </span><span style="color: #0000ff;">var</span> formId = 'jUploadForm' +<span style="color: #000000;"> id;

    </span><span style="color: #008000;">//</span><span style="color: #008000;"> Watch for a new set of requests</span>

    <span style="color: #0000ff;">if</span> ( s.global &amp;&amp; ! jQuery.active++<span style="color: #000000;"> )

    {

        jQuery.event.trigger( </span>"ajaxStart"<span style="color: #000000;"> );

    }

    </span><span style="color: #0000ff;">var</span> requestDone = <span style="color: #0000ff;">false</span><span style="color: #000000;">;

    </span><span style="color: #008000;">//</span><span style="color: #008000;"> Create the request object</span>

    <span style="color: #0000ff;">var</span> xml =<span style="color: #000000;"> {}

    </span><span style="color: #0000ff;">if</span><span style="color: #000000;"> ( s.global )

        jQuery.event.trigger(</span>"ajaxSend"<span style="color: #000000;">, [xml, s]);

    </span><span style="color: #008000;">//</span><span style="color: #008000;"> Wait for a response to come back</span>

    <span style="color: #0000ff;">var</span> uploadCallback = <span style="color: #0000ff;">function</span><span style="color: #000000;">(isTimeout)

    {

        </span><span style="color: #0000ff;">var</span> io =<span style="color: #000000;"> document.getElementById(frameId);

        </span><span style="color: #0000ff;">try</span><span style="color: #000000;">

        {

            </span><span style="color: #0000ff;">if</span><span style="color: #000000;">(io.contentWindow)

            {

                 xml.responseText </span>= io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:<span style="color: #0000ff;">null</span><span style="color: #000000;">;

                 xml.responseXML </span>= io.contentWindow.document.XMLDocument?<span style="color: #000000;">io.contentWindow.document.XMLDocument:io.contentWindow.document;

            }</span><span style="color: #0000ff;">else</span> <span style="color: #0000ff;">if</span><span style="color: #000000;">(io.contentDocument)

            {

                 xml.responseText </span>= io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:<span style="color: #0000ff;">null</span><span style="color: #000000;">;

                xml.responseXML </span>= io.contentDocument.document.XMLDocument?<span style="color: #000000;">io.contentDocument.document.XMLDocument:io.contentDocument.document;

            }

        }</span><span style="color: #0000ff;">catch</span><span style="color: #000000;">(e)

        {

            jQuery.handleError(s, xml, </span><span style="color: #0000ff;">null</span><span style="color: #000000;">, e);

        }

        </span><span style="color: #0000ff;">if</span> ( xml || isTimeout == "timeout"<span style="color: #000000;">)

        {

            requestDone </span>= <span style="color: #0000ff;">true</span><span style="color: #000000;">;

            </span><span style="color: #0000ff;">var</span><span style="color: #000000;"> status;

            </span><span style="color: #0000ff;">try</span><span style="color: #000000;"> {

                status </span>= isTimeout != "timeout" ? "success" : "error"<span style="color: #000000;">;

                </span><span style="color: #008000;">//</span><span style="color: #008000;"> Make sure that the request was successful or notmodified</span>

                <span style="color: #0000ff;">if</span> ( status != "error"<span style="color: #000000;"> )

                {

                    </span><span style="color: #008000;">//</span><span style="color: #008000;"> process the data (runs the xml through httpData regardless of callback)</span>

                    <span style="color: #0000ff;">var</span> data =<span style="color: #000000;"> jQuery.uploadHttpData( xml, s.dataType );

                    </span><span style="color: #008000;">//</span><span style="color: #008000;"> If a local callback was specified, fire it and pass it the data</span>

                    <span style="color: #0000ff;">if</span><span style="color: #000000;"> ( s.success )

                        s.success( data, status );

                    </span><span style="color: #008000;">//</span><span style="color: #008000;"> Fire the global callback</span>

                    <span style="color: #0000ff;">if</span><span style="color: #000000;">( s.global )

                        jQuery.event.trigger( </span>"ajaxSuccess"<span style="color: #000000;">, [xml, s] );

                } </span><span style="color: #0000ff;">else</span><span style="color: #000000;">

                    jQuery.handleError(s, xml, status);

            } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;">(e)

            {

                status </span>= "error"<span style="color: #000000;">;

                jQuery.handleError(s, xml, status, e);

            }

            </span><span style="color: #008000;">//</span><span style="color: #008000;"> The request was completed</span>

            <span style="color: #0000ff;">if</span><span style="color: #000000;">( s.global )

                jQuery.event.trigger( </span>"ajaxComplete"<span style="color: #000000;">, [xml, s] );

            </span><span style="color: #008000;">//</span><span style="color: #008000;"> Handle the global AJAX counter</span>

            <span style="color: #0000ff;">if</span> ( s.global &amp;&amp; ! --<span style="color: #000000;">jQuery.active )

                jQuery.event.trigger( </span>"ajaxStop"<span style="color: #000000;"> );

            </span><span style="color: #008000;">//</span><span style="color: #008000;"> Process result</span>

            <span style="color: #0000ff;">if</span><span style="color: #000000;"> ( s.complete )

                s.complete(xml, status);

            jQuery(io).unbind()

            setTimeout(</span><span style="color: #0000ff;">function</span><span style="color: #000000;">()

                                {    </span><span style="color: #0000ff;">try</span><span style="color: #000000;">

                                    {

                                        jQuery(io).remove();

                                        jQuery(form).remove();    

                                    } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;">(e)

                                    {

                                        jQuery.handleError(s, xml, </span><span style="color: #0000ff;">null</span><span style="color: #000000;">, e);

                                    }                                    

                                }, </span>100<span style="color: #000000;">)

            xml </span>= <span style="color: #0000ff;">null</span><span style="color: #000000;">

        }

    }

    </span><span style="color: #008000;">//</span><span style="color: #008000;"> Timeout checker</span>

    <span style="color: #0000ff;">if</span> ( s.timeout &gt; 0<span style="color: #000000;"> )

    {

        setTimeout(</span><span style="color: #0000ff;">function</span><span style="color: #000000;">(){

            </span><span style="color: #008000;">//</span><span style="color: #008000;"> Check to see if the request is still happening</span>

            <span style="color: #0000ff;">if</span>( !requestDone ) uploadCallback( "timeout"<span style="color: #000000;"> );

        }, s.timeout);

    }

    </span><span style="color: #0000ff;">try</span><span style="color: #000000;">

    {

        </span><span style="color: #0000ff;">var</span> form = jQuery('#' +<span style="color: #000000;"> formId);

        jQuery(form).attr(</span>'action'<span style="color: #000000;">, s.url);

        jQuery(form).attr(</span>'method', 'POST'<span style="color: #000000;">);

        jQuery(form).attr(</span>'target'<span style="color: #000000;">, frameId);

        </span><span style="color: #0000ff;">if</span><span style="color: #000000;">(form.encoding)

        {

            jQuery(form).attr(</span>'encoding', 'multipart/form-data'<span style="color: #000000;">);

        }

        </span><span style="color: #0000ff;">else</span><span style="color: #000000;">

        {

            jQuery(form).attr(</span>'enctype', 'multipart/form-data'<span style="color: #000000;">);

        }

        jQuery(form).submit();

    } </span><span style="color: #0000ff;">catch</span><span style="color: #000000;">(e)

    {

        jQuery.handleError(s, xml, </span><span style="color: #0000ff;">null</span><span style="color: #000000;">, e);

    }

    jQuery(</span>'#' +<span style="color: #000000;"> frameId).load(uploadCallback    );

    </span><span style="color: #0000ff;">return</span> {abort: <span style="color: #0000ff;">function</span><span style="color: #000000;"> () {}};    

},

uploadHttpData: </span><span style="color: #0000ff;">function</span><span style="color: #000000;">( r, type ) {

    </span><span style="color: #0000ff;">var</span> data = !<span style="color: #000000;">type;

    data </span>= type == "xml" || data ?<span style="color: #000000;"> r.responseXML : r.responseText;

    </span><span style="color: #008000;">//</span><span style="color: #008000;"> If the type is "script", eval it in global context</span>

    <span style="color: #0000ff;">if</span> ( type == "script"<span style="color: #000000;"> )

        jQuery.globalEval( data );

    </span><span style="color: #008000;">//</span><span style="color: #008000;"> Get the JavaScript object, if JSON is used.</span>

    <span style="color: #0000ff;">if</span> ( type == "json"<span style="color: #000000;"> )

        </span><span style="color: #0000ff;">var</span> reg = /&lt;pre.+?&gt;(.+)&lt;\/pre&gt;/<span style="color: #000000;">g;

        </span><span style="color: #0000ff;">var</span> result =<span style="color: #000000;"> data.match(reg);

        data </span>= RegExp.$1<span style="color: #000000;">;

        eval( </span>"data = " +<span style="color: #000000;"> data );

    </span><span style="color: #008000;">//</span><span style="color: #008000;"> evaluate scripts within html</span>

    <span style="color: #0000ff;">if</span> ( type == "html"<span style="color: #000000;"> )

        jQuery(</span>"&lt;div&gt;"<span style="color: #000000;">).html(data).evalScripts();

    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> data;

}


})

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