//这是前台的代码 
 $(function () {
            $("#uploadify").uploadify({
                height: 30,
                swf: '/images/uploadify.swf',
                uploader: GetMKTHandler() + "?oper=Uploadify",
                buttonText: '打开文件夹',
                cancelImg: '/images/uploadify-cancel.png',
                width: 120,
                removeTimeout: 0,
                formData: cusid,
                fileTypeExts: '*.mp4; *.avi; *.mkv',
                fileSizeLimit:0,
                onUploadSuccess: function (file, data) {                   
                    var result = eval("(" + data + ")");
                    if (result.HasError == 0) {                     
                            $("#voidePath").css('display', '');
                            $("#voidePath").attr('src', '');
                            $("#voidePath").attr('src', eval("(" + result.ResultStr + ")"));                                                     
                    }
                    else {
                        AlertError('popImportVoide_div_alert', result.ErrorInfo);
                        return false;
                    }
                },
                onUploadComplete: function (file) {
                    popImportVoide.popAdd.removePop();
                },
            });
        });

//ashx中 获取到前台传入的视频  并使用aliyun的PutObject进行视频上传，但是iis还未上传完毕时前台直接进入uploadify的onUploadSuccess方法中，导致任何内容传入，这该怎么解决啊