js implements a simple modal window, the background is grayed out_javascript skills

There's nothing to say, it's all JS. An iframe is used to block the page. There is a div layer above the iframe. It is made with JS object-oriented. Some of it is dynamically generated style by JS.
ModeWindow.js

Copy code The code is as follows:

Here I come!

< ;/body>

Online demohttp://img.jb51.net/online/ModeWindow/index.htm