location, url, hash

locations.js

location = {
  host: "stackoverflow.com",
  hostname: "stackoverflow.com",
  href: "http://stackoverflow.com/questions/2300771/jquery-domain-get-url",
  pathname: "/questions/2300771/jquery-domain-get-url",
  port: "",
  protocol: "http:"
}

location.host // would be the domain
location.protocol + "//" + location.host // complete first part of the url
document.baseURI // gives you the domain + port. It's used if an image tag uses a relative instead of an absolute path
document.baseURI + window.location.hash // complete first part of the url + hash, example: http://stackoverflow.com/#section