code: function( file ) {
                  var me = this;
      
                  file = file.id ? file : me.queue.getFile( file );
      
                  file.setStatus( Status.CANCELLED );
                  me.owner.trigger( 'fileDequeued', file );
              }
docs: @event fileDequeued
  @param {File} file File对象
  @description 当文件被移除队列后触发。
  @for  Uploader
   
  @method removeFile
  @grammar removeFile( file ) => undefined
  @grammar removeFile( id ) => undefined
  @param {File|id} file File对象或这File对象的id
  @description 移除某一文件。
  @for  Uploader
  @example
  
  $li.on('click', '.remove-this', function() {
  uploader.removeFile( file );
  })