通过键盘按键，控制各个物体（茶壶、桌子和兔子）的显示状态.对各个物体分别用显示列表进行绘制，重复上面的交互控制。

增加键盘按键来切换显示列表和非显示列表绘制方式，通过动画以及对FPS的理解和分析，理解显示列表对程序绘制性能的影响。

-Through the keyboard keys to control the various objects (teapots, tables and rabbit) the display of status. Separately for each object using the display list for rendering, interactive control duplicate the above. Increase the keyboard keys to switch the display list and non-display list rendering, through animation and FPS understanding and analysis, understanding of the process display list rendering performance.