模仿360自动更换桌面背景的功能。可利用的图片为jpeg.gif.bmp等，通过设置图片存放的本地路径及自动播放时间可实现自动切换背景桌面。-Automatically change your desktop background to mimic 360 functions. The pictures can be used for jpeg.gif.bmp and other local path by setting the picture stored and automatically