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wow.js, you can take a look, it needs to be used with animation.css.
https://github.com/matthieua/WOW
https://daneden.github.io/ani...

oppo’s example: http://www.dowebok.com/demo/1...
In addition, you can also write it yourself.

Written by myself, monitor the scroll bar when it reaches the scroll height, and give a class to the elements that need animation. This class is a css animation

You can write it directly with CSS3, combined with JS

The correct answer upstairs can be achieved with WOW.js. When reaching the current height, an animation class will be added

scrollReveal.js This is what I use. http://dreamwq.com/home/ You can feel it

Written by yourself is scrollTop