I would like to run a piece of code on all my subdomains all with different pages on them (using JS). I could of course write a function and call it from all individual subdomains, but I hope there is a way to do it dynamically. So if I would create a new subdomain it would automatically also run the code there.

I thought of removing the subdomains so everything would lead to one file, executing the code and then redirecting to the correct page, but then the subdomain wouldnt show up in the url bar. Thinking of it, that still wouldnt make it dynamic...

What would be the best way to do this?