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，理解显示列表对程序绘制性能的影响。

-Various objects were drawn to the display list, repeat the above interactive control. Increase the keyboard keys to switch the display list and non-display list rendering, through animation, the understanding of the process display list rendering performance.