querrystring to object

querrystring to object

/**
 * converts querystring to object. Allows multiple values per key
 * @param  {String} querystring - optional querystring. default address bar
 * @return {object}
 */
    self.querystringToObject = function(querystring){
        var params = {};
        (querystring || window.location.search)
            .replace(/([^?=&]+)(=([^&]*))?/g, function($0, $1, $2, $3) {
                if (params[$1]){
                    if (!$.isArray(params[$1])){
                        params[$1] = [params[$1]];    
                    }
                    params[$1].push($3);
                }else{
                    params[$1] = $3;
                }
            });
        return params;
    }