How to add js file to all pages of the site?

Question

JavaScript

It is necessary to add script .js to all pages of the site, including those nested in subfolders.
Adding to the footer, for example, I do not cover other site folders and pages where the footer is not connected.
Is there an option to add the file via root .htaccess or other options to add a .js file?

Answer 1

Run a script on the node that will open all project files and inject the necessary line before /body. A task for 5 minutes for the knowledgeable, for half an hour for the not very knowledgeable.
Well, or hands.

Answer 2

If on-the-fly conversion with .htaccess is required, you should probably look into filters in Apache . I can't say anything more.