text: //路由函数
  function route(handle, pathname, response) {
    if (typeof handle[pathname] === 'function') {
       handle[pathname](response); //不同路由的方法
    } else {
      response.writeHead(404, {'Content-Type': 'text/plain'});
      response.end('404 Not Found'); //404
    }
  }
  
  exports.route = route;
  