Refresh js and css every session

i want that a user make the login, the js and css are force to refresh themself

How can i do?

Thanks

You mean you want to invalidate the cache for some script.js or style.css files? You can add dummy GET parameter like this:

<link rel="stylesheet" href="style.css?needrefresh12345" />

Or if you log in users without page reload (Ajax) you can add that dummy argument to the src and href attributes with Javascript.

For forcefully refresh css, you can dynamically load css using jquery.