Why doesn't js work on a subdomain?

Question

JavaScript

Hello. There is a simple site on html, a couple of js are connected to it. They don't do anything in particular (a slider, a heart is attached to the menu, etc.)
For some reason, it works on the main 1-level domain i.e. everything is fine on websait.ru, but on xxx.websait.ru there is no heart, no extra. functions that should be (retractable panel, etc.)
What do you need to lay out so that you can tell?
https://docs.google.com/document/d/1rVlAO8cTqllvMf...