实现了一个在窗口上模拟雪花飘落的动画场景，动画优美，配合悦耳的背景音乐。实现了在窗口中播放动画，播放背景音乐的功能，是值得研究的源码。-Implements a simulation of snow falling on the window animation scenes, animation and beautiful, with sweet background music. To achieve the animation in the window, play background