code: function () {
      var parts;
  
      if (!this.queryString) return;
  
      parts = this.queryString.replace('?','').split('&');
  
      each(parts, function (part) {
        var key = decodeURIComponent( part.split('=')[0] ),
            val = decodeURIComponent( part.split('=')[1] );
  
        if ( part.indexOf( '=' ) === -1 ) return;
        this._applyQueryParam( key, val );
  
      }, this);
  
    }
docs: Splits the query string by '&'. Splits each part by '='.
  Passes the key and value for each part to _applyQueryParam
  
  @method _extractQueryParamsFromQueryString
  @private