泡泡运动，通过载入泡泡图片和背景。运用动量守恒定律来实现泡泡的碰撞。可能缺少几个图片，大家自己补充一下就好-Bubble motion pictures and background by loading bubble. The use of the law of conservation of momentum to achieve bubble collisions. May be missing a few pictures, we like to add your own