模拟小球与墙壁的碰撞，同时通过随机数确定小球运行的初始速度和角度和小球的颜色，碰撞时模拟碰撞发声。-Simulated ball collision with the wall, through the random number to determine the small-ball run the initial speed and angle and color of the ball, collision simulation of the collision sound.