code: function(_config){
              if (!_config) return;
              this.__config.r.push(_config);
              // parse build-in rewrite rule
              _u._$forEach(_buildin,
                  function(_key){
                      if (!_config[_key]) return;
                      this.__config.rr[_key] = _config[_key];
                      delete _config[_key];
                  },this);
          }
docs: regist rewrite