滚动的小球，可以控制暂停，滚动等 自己手工写的一个类，可以随即生成不同颜色的小球，碰撞之后往反方向滚动 开发IDE为VS2005-rolling balls, the suspension can be controlled, such as rolling their manual written by a class, can then generate different colors of small ball, the collision after rolling the o