code: function middleware($names) : self {
          if (!isset($this->_pSet[self::_SIBLINGS])) {
              Console::warning("No route to bind middleware.");
              return $this;
          }
          if (!is_array($names))
              $names = [$names];
          foreach ($this->_pSet[self::_SIBLINGS] as &$pSet) {
              foreach ($names as $name) {
                  $callback = Middleware::fetch($name);
                  if ($callback) {
                      if (!is_callable($callback)) {
                          Console::warning('Failed to bind middleware. Callback function not callable.');
                          continue;
                      }
                      $this->_toClosure($callback);
                      $pSet[self::_MIDDLEWARE][] = $callback;
                  }
              }
          }
          return $this;
      }
docs: 绑定中间件
  
  @param mixed $names
  @return Router