Parse the current window location's query parameters into a map

parseQueryString.js

function parseQueryString() {
      var query = (window.location.search || '?').substr(1),
          map = {};
      query.replace(/([^&=]+)=?([^&]*)(?:&+|$)/g, function(match, key, value) {
          (map[key] = map[key] || []).push(value);
      });
      return map;
  }