code: function(isFromControl) {
          clearPaint();
          slideJump = ''; //j 幻灯片跳转
          if (isControl) {
              $body.classList.add('with-notes');
              $body.classList.add('popup');
          }
          isStopTouchEvent = false;
          $drawBoard.removeEventListener('mousedown', pMouseDown);
          $drawBoard.removeEventListener('mouseup', pMouseUp);
          $drawBoard.removeEventListener('mousemove', pMouseMove);
          //滑动
          $drawBoard.removeEventListener('touchstart', pMouseDown);
          $drawBoard.removeEventListener('touchmove', pMouseMove);
          $drawBoard.removeEventListener('touchend', pMouseUp);
          $drawBoard.removeEventListener('touchcancel', pMouseUp);
  
  
          $doc.removeEventListener('selectstart', stopSelect, true);
          if (!isFromControl) {
              $B.fire('remove paint');
          }
      }
docs: 删除画板