JavaScript implementation of the top and bottom seamless scrolling effect _javascript skills

This article describes the JavaScript implementation of the top and bottom seamless scrolling effect. Share to everyone for your reference, specific as follows:

The previous introduction of JS seamless scrolling effect, now do under the seamless scrolling-up and down the effect. The other code is about the same as about, just changing the value of the offsettop, and does not need to calculate the overall width of the UL.

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If you want to change the speed of the move, modify the value of the speed, the initial default to move up, that is, the speed is negative.

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I hope this article will help you with JavaScript programming.