音乐褪色，在和淡入淡出效果。

Music fades in and fades out.

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在各个窗口中到处移动鼠标，查看跨越显示屏跟踪的焦点指示器和淡出效果。

Move the mouse around into various Windows to see the focus designator track across your display and gradually fade out.

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因此，for循环将在每次呈现时减少阿尔法混合量，以在程序退出前创建有效的淡出效果。

The for loop, therefore, reduces the alpha-blending amount in each pass to create an effective fade-out before the program exits.

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