仿迅雷的窗口动画（淡入淡出的动画效果），我做的速度有点慢，你可以适当改变透明度增量和窗口尺寸增量以达到预期速度-Thunder imitation window animation (fade in animation), I did a bit slow, you can change the transparency of the appropriate window size increment and increment in order to achieve the expected rate