我如何获得一个滚动页面和导航的导航，当它使用普通的javascript到达顶部导航

Question

How can make a div elememt move up when a user scrolls and then stay fixed when it reaches the top of the page? I already have a fixed bar under which i expect this div to stay.

Answer 1

What you want is a sticky block. There is a (relatively) new CSS feature position: sticky , but unfortunately it works not in all browsers. You can use it in combination with a polyfill