jquery uploadify如何取消已上传成功文件

.uploadify-queue-item .cancel a { 
  background: url('../img/uploadify-cancel.png') 0 0 no-repeat; 
  float: right; 
  height: 16px; 
  text-indent: -9999px; 
  width: 16px; 
} 

onUploadSuccess:function(file, data, response) { 
    var cancel=$('#fileQueue .uploadify-queue-item[id="' + file.Id + '"]').find(".cancel a"); 
if (cancel) { 
  cancel.attr("deletefileid",file.id); 
  cancel.click(function () { 
    //我的处理逻辑 
    //1.首先调用ajax 传递文件名到后台,后台删除对应的文件(这个我就不写了) 
    //2.从后台返回的为true,表明删除成功;返回false,表明删除失败 
     var deletefileid = cancel.attr("deletefileid"); 
     $("#uploadify").uploadify("cancel",deletefileid);//将上传队列中的文件删除. 
  }); 
} 
} 

cancel : function(fileID, supressEvent) { 
 
  var args = arguments; 
 
  this.each(function() { 
    // Create a reference to the jQuery DOM object 
    var $this    = $(this), 
      swfuploadify = $this.data('uploadify'), 
      settings   = swfuploadify.settings, 
      delay    = -1; 
 
    if (args[0]) { 
      // Clear the queue 
      if (args[0] == '*') { 
        var queueItemCount = swfuploadify.queueData.queueLength; 
        $('#' + settings.queueID).find('.uploadify-queue-item').each(function() { 
          delay++; 
          if (args[1] === true) { 
            swfuploadify.cancelUpload($(this).attr('id'), false); 
          } else { 
            swfuploadify.cancelUpload($(this).attr('id')); 
          } 
          $(this).find('.data').removeClass('data').html(' - Cancelled'); 
          $(this).find('.uploadify-progress-bar').remove(); 
          $(this).delay(1000 + 100 * delay).fadeOut(500, function() { 
            $(this).remove(); 
          }); 
        }); 
        swfuploadify.queueData.queueSize  = 0; 
        swfuploadify.queueData.queueLength = 0; 
        // Trigger the onClearQueue event 
        if (settings.onClearQueue) settings.onClearQueue.call($this, queueItemCount); 
      } else { 
        for (var n = 0; n < args.length; n++) { 
          swfuploadify.cancelUpload(args[n]); 
          /* 添加代码 */ 
          delete swfuploadify.queueData.files[args[n]]; 
          swfuploadify.queueData.queueLength = swfuploadify.queueData.queueLength - 1; 
          /* 添加结束 */ 
          $('#' + args[n]).find('.data').removeClass('data').html(' - Cancelled'); 
          $('#' + args[n]).find('.uploadify-progress-bar').remove(); 
          $('#' + args[n]).delay(1000 + 100 * n).fadeOut(500, function() { 
            $(this).remove(); 
          }); 
        } 
      } 
    } else { 
      var item = $('#' + settings.queueID).find('.uploadify-queue-item').get(0); 
      $item = $(item); 
      swfuploadify.cancelUpload($item.attr('id')); 
      $item.find('.data').removeClass('data').html(' - Cancelled'); 
      $item.find('.uploadify-progress-bar').remove(); 
      $item.delay(1000).fadeOut(500, function() { 
        $(this).remove(); 
      }); 
    } 
  }); 
 
},