How to replace Javascript of production website with local Javascript?

Question

On my production website, I have compiled Javascript.

It would be very convient for

Answer 1

Add something to your URL to distinguish between your dev and prod context ; example : http://url_of_prod.com

http://url_of_dev.com?debug=true

and then, use some javascript to check if the GET variable debug is ON or NOT or check the URL with
if (window.location.host.indexOf(‘url_of_dev’) > -1) ...

THEN USE a load function to load or not your file, as in this example : http://www.softpeople.fr/replaceswitch-dev-local-production-website-javascript-during-debug/