query string to map

querystring.js

    // execute on ready state
    jQuery.extend({
       getQueryParameters : function (str) {
           return (str || document.location.search).replace(/(^\?)/, '').split("&").map(function (n) {
               return n = n.split("="), this[n[0]] = n[1], this
           }.bind({}))[0];
        }
    });