css js implements partial area highlighting and editable mask layer_javascript skills

I think everyone has done common functions such as mask layers, implemented with css or jquery, and the implementation methods are diverse. Here http:// I introduce the method I implemented in the project, full-screen mask, some areas are operable, very practical .

The effect is as follows:

js implementation part:

Copy code code As follows:

Page code:

Copy code The code is as follows :

Activate mask layer

This is the highlighted area Username < ;/p> Password

I am the third column