Get The Current Domain Name With Javascript (Not the path, etc.)

Question

I plan on buying two domain names for the same site. Depending on which domain is used I plan on providing slightly different data on the page. Is there a way for me to de

Answer 1

       Feel free to visit our “Contact” link

Indeed worked for me whereas I couldn't use PHP

Just tested that it worked thanks to the approach mentioned above in some of the answers, so quick and verified that worked