code skills on wordpress

Hi,

wordpress : someone can tell me how can add file .JS on this script >> <script src="domain.com/file.js" type="text/javascript"></script> because i try it don't work i have php code i want to convert them to .js and him to script up someone help me please.

Cordially

Oh, that's a mess..
What are you trying to achieve?
PHP is for server side and JS is for browser, that's how it usually works. But you are trying to mix both.