Get param from url

paramify.js

var qs = (function(a) {
  if (a === '') return {};
  var b = {};
  for (var i = 0; i < a.length; ++i) {
  var p = a[i].split('=');
    if (p.length != 2) continue;
    b[p[0]] = decodeURIComponent(p[1].replace(/\+/g, ' '));
  }
  return b;
})(window.location.search.substr(1).split('&'));