jquery.fileupload插件 ie9下不支持上传

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var
url = ctx   + fileServiceURL.saveFiles;//上传文件的地址

         var
iframe = false;

            if($.browser.msie  && $.browser.version < 10){ 

                iframe = true;

            }

        $(‘#‘
+ _this.ctlID ).fileupload({

            url: url,

            //forceIframeTransport: forceIframeTransport,

             iframe: iframe,

            dataType: ‘json‘,

            //datatype: dataType,

            autoUpload: true,

            //sequentialUploads : true,

            formData: {signUploadFile: _this.signature},

            maxFileSize: 5000000, // 5 MB

            previewMaxWidth: 100,

            previewMaxHeight: 100,

            previewCrop: true

        }).on(‘fileuploadadd‘, function
(e, data) {

            pageLock("show");

        }).on("fileuploadsubmit", function(e, data){

            if(_this.signature && !_this.validSignatureUSB()){

                pageLock("hide");

                return
false;

            }

            return
true;

        }).on(‘fileuploaddone‘, function
(e, data) {

            pageLock("hide");

            if((typeof
data.result) == "undefined"){

                oAlert("不支持上传该格式的文件");

            }else{

                $.each(data.result.data, function(index){

                    //console.log("new file " + this.fileID);

                    _this.addFile(this.filename, this.fileID,  this.contentType, this.digestValue,  this.digestAlgorithm,  this.certificate, true);

                });

            }

        }).on(‘fileuploadfail‘, function
(e, data) {

            pageLock("hide");

            if((typeof
data.result) == "undefined"){

                oAlert("可能您上传的文件格式不被支持!!!");

            }else{

                $.each(data.result.files, function
(index, file) {

                    var
error = $(‘<span/>‘).text(file.error);

                    $(data.context.children()[index])

                        .append(‘<br>‘)

                        .append(error);

                });

            }

        });