uri.js

var parser = document.createElement('a');
parser.href = "http://example.com:3000/pathname/?search=test#hash";

(function(){
  parser.isLocal = (window.location.host === parser.host) ? true : false; // determine if is local url
  parser.fullPath = parser.host + parser.pathname + parser.hash;
  parser.params = {};
  
   // Convert query string to object
  var split, 
      queries = parser.search.replace(/^\?/, '').split('&')
  ;
  for (i = 0; i < queries.length; i++) {
    split = queries[i].split('=');
    parser.params[split[0]] = split[1];
  }
})();

//parser.protocol; // => "http:"
//parser.hostname; // => "example.com"
//parser.port;     // => "3000"
//parser.pathname; // => "/pathname/"
//parser.search;   // => "?search=test"
//parser.hash;     // => "#hash"
//parser.host;     // => "example.com:3000"
//parser.fullPath; // => "example.com:3000/pathname/#hash"
//parser.isLocal;  // => false
//parser.params;   // => [object Object] { search: "test" }

Added support for parameters object and isLocal detection.