code: function (eventType, handler) {
  		var fn = handler;
  		// touch
  		if (hasTouch && eventType === 'click') {
  			eventType = 'touchstart';
  			fn = function (e) {
  				e.preventDefault();
  				handler();
  			};
  		}
  		// simplest possible event model for internal use
  		this.element['on' + eventType] = fn;
  		return this;
  	}
docs: Add an event listener
  @param {String} eventType
  @param {Function} handler