跑马灯

代码说明：

  跑马灯是一种电脑编程工具，利用涂鸦等效果显示文字。电脑中的跑马灯，跑马灯在编程中，通常指有时需要用一矩形条显示少量用户特别关心的信息，这条信息串首尾相连，向一个方向循环滚动。(The marquee is a computer programming tool that uses text such as graffiti to display text. In the computer, the marquee and the marquee are usually programmed to display a small amount of information that the user is particularly concerned with. This string of information is connected end to end and scrolls in one direction.)