实现网上流行的逐行广告滚动,即一定秒数滚动一行,并非线性滚动.改良后,可以由文字的滚动做成图片逐行滚动,每行可以有若干条-Realize the popular progressive online advertising rolling, that is, a certain number of seconds a rolling line, and non-linear scroll. Improvement can be made