code: function () {
              this.removeListener();
      
              if ( MS_POINTER && this._isEndEvent ) {
                  document.removeEventListener( this._getCrossType('touchend'), this._touchHandler, false );
                  document.removeEventListener( this._getCrossType('touchcancel'), this._touchHandler, false );
                  this._isEndEvent = false;
              }
      
              return this;
          }
docs: 등록된 모든 이벤트 삭제
  @return	{TouchEvent}