Difference between document.URL and location.href
Solution 1:
You can get the document.URL, but you can not set it.
You can both get and set the location.href.
In some webbrowsers, you are able to set the document.URL but please don't, as it doesn't work in most browsers.
You gave the answer yourself!
var currentURL = document.URL;
alert(currentURL);
Learn more here
Solution 2:
They're interchangeable as far as getting data is concerned, but as you pointed out document.URL can not be set. I just always use location.href since it's a getter/setter.