code: function (key, value) {
              var self = this, _queryMap;
              parseQuery(self);
              _queryMap = self._queryMap;
              if (typeof key === 'string') {
                  self._queryMap[key] = value;
              } else {
                  if (key instanceof Query) {
                      key = key.get();
                  }
                  S.each(key, function (v, k) {
                      _queryMap[k] = v;
                  });
              }
              return self;
          }
docs: Set parameter value corresponding to current key
  @param {String} key
  @param value
  @chainable