The _javascript technique of realizing full screen transparent masking div layer lock screen effect based on JavaScript

Nonsense not to say, directly to everyone to write JS code, the code looks like this:

<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">  

The following code is a login mask effect written with JS

<!
DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" >  

The above is based on JavaScript to achieve full screen transparent mask div layer lock screen effect of the relevant content, I hope to help.