Detecting URL Change in javascript?

Question

Not a hash change but a URL change. I know that with hashes you can use the jquery plugin like so

$(window).on('hashchange', function(e){
 // Your Code goes here
});

but i've yet to see how to detect a url change that doesn't involve a hash.

ex.

http://www.google.com -> http://www.google.com/woot

I want to be able to detect a certain URL so i can run a function that will display a button on that page.