extracts and parses url query string

getQuery.js

(function(window){
  'use strict';
  function getQuery(query){
    var args = decodeURIComponent(location.search).substring(1).split('&');
    var argsParsed = {};
    var i, arg, kvp, key, value;
    for (i=0; i < args.length; i++) {
      arg = args[i];
      if (-1 === arg.indexOf('=')) {
        argsParsed[decodeURIComponent(arg).trim()] = true;
      }
      else {
        kvp = arg.split('=');
        key = decodeURIComponent(kvp[0]).trim();
        value = decodeURIComponent(kvp[1]).trim();
        argsParsed[key] = value;
      }
    }
    return argsParsed[query];
  }

  window.getQuery = window.getQuery || getQuery;

})(window);