PiotrPress

Clearcode

The CC-Scripts plugin gives Admin users the ability to add custom JavaScript code to every page on WordPress website in the head/footer and/or directly after the opening body html tag. 
Additionally, you can minify scripts using JSMin php library and/or displaying it selectively using dependencies. 
The best part is that you can do this from the Admin panel, perfect for those who don’t have the programming skills needed to manually add custom JavaScript code to template files.

CC-Scripts

Add custom JavaScript code to all your WordPress pages at once via the Admin panel.

Anil Ankola

This is a really simple way to add body class and is especially useful if you are creating a theme or website.

Add Custom Body Class

Use this plugin to add a custom class in the HTML body tag.

CC-Scripts vs Add Custom Body Class