css3 - How to achieve the effect of each part of the page appearing as the scroll bar slides down?

Question

I looked at a website. As the scroll bar slides down, every part of the page has the same effect as when it was first loaded. After refreshing again, these effects will reappear. How is this done? Is it written in the load of jquery? It is similar to the homepage of this website http://www.itxdl.cn/bra...

漂亮男人 · Answer

The one above is wrong
OK I looked at the source code.

Look at this library!
wow.jswow

This is the correct answer. When you have time, you can look at the source code of wow. It shouldn't be difficult.

某草草 · Answer

The principle is very simple, hang a time to monitor the scrolling time, determine the current scrollTop and the offsettop of each element to operate