//多个路由匹配一个路由中间件

 app.use(['/gre+t', '/hel{2}o'], greet);

 var greet = express.Router();

 greet.get('/jp', function (req, res) {

   console.log(req.baseUrl); // /greet

   res.send('Konichiwa!');

 });

 app.use('/greet', greet);

 //多个中间件匹配一个路由

 app.use('/rtest', [r1, r2]);

 var r1 = express.Router();

 r1.get('/', function (req, res, next) {

   console.log("r1 router");

   next();

 })

 var r2 = express.Router();

 r2.get('/', function (req, res, next) {

   console.log('r2 router ');

   res.send("r2 router " + req.app.get("view engine"))

   // next();

 })