var express = require('express');
var app = express();
app.param(function(param, option) {
 return function (req, res, next, val) {
 if (val == option) {
  next(); //
 }
 else {
  res.sendStatus(404);
 }
 }
});
app.param('id', 1337);
app.get('/user/:id', function (req, res) {
 res.send('参数通过检验');
});

app.listen(3000, function () {
 console.log('Ready');
});

express deprecated router.param(fn):Refactor to use path params

var express = require('express');
 var app = express();
 app.param('id', function (req, res, next, id) {
 if(req.params.id==1337){
  next();
 }
 else{
  res.sendStatus(404);
 }
 });
 app.param('id', 1337);
 app.get('/user/:id', function (req, res) {
  res.send('参数通过检验');
 });
 
 app.listen(3000, function () {
  console.log('Ready');
 });