Found this useful snippet in http://getbootstrap.com/customize/

getQueryParam.js

function getQueryParam(key) {
  key = key.replace(/[*+?^$.\[\]{}()|\\\/]/g, "\\$&"); // escape RegEx meta chars
  var match = location.search.match(new RegExp("[?&]"+key+"=([^&]+)(&|$)"));
  return match && decodeURIComponent(match[1].replace(/\+/g, " "));
}
  
// ?id=123
// getQueryParam('id') --> 123