Javascript + css implements the center-facing mask pop-up layer (scroll with the browser window scroll bar) _ javascript tips-js tutorial

This article describes in detail how to use js to implement the center of the mask pop-up layer and scroll along with the browser window scroll bar. The sample code is as follows, if you are interested, you can refer to the js + css below to implement the mask center pop-up layer (scroll with the browser window scroll bar)

The Code is as follows:

I am the body, I am the body


I am the body, I am the body


I am the body, I am the body


I am the body, I am the body


I am the body, I am the body

Is the pop-up layer centered?

Center center Center

Center center Center

Center center Center

Center center Center