NodeJS Passport TypeError：undefined不是一个函数

我正在使用护照模块node.js，我收到以下错误：

TypeError: undefined is not a function at module.exports (C:\cygwin64\home\Home\gethweb\routes\index.js:21:33) at Layer.handle [as handle_request] (C:\cygwin64\home\Home\gethweb\node_modules\express\lib\router\layer.js:95:5) at trim_prefix (C:\cygwin64\home\Home\gethweb\node_modules\express\lib\router\index.js:312:13) at C:\cygwin64\home\Home\gethweb\node_modules\express\lib\router\index.js:280:7 at Function.process_params (C:\cygwin64\home\Home\gethweb\node_modules\express\lib\router\index.js:330:12) at next (C:\cygwin64\home\Home\gethweb\node_modules\express\lib\router\index.js:271:10) at C:\cygwin64\home\Home\gethweb\node_modules\connect-flash\lib\flash.js:21:5 at Layer.handle [as handle_request] (C:\cygwin64\home\Home\gethweb\node_modules\express\lib\router\layer.js:95:5) at trim_prefix (C:\cygwin64\home\Home\gethweb\node_modules\express\lib\router\index.js:312:13) at C:\cygwin64\home\Home\gethweb\node_modules\express\lib\router\index.js:280:7 at Function.process_params (C:\cygwin64\home\Home\gethweb\node_modules\express\lib\router\index.js:330:12) at next (C:\cygwin64\home\Home\gethweb\node_modules\express\lib\router\index.js:271:10) at SessionStrategy.strategy.pass (C:\cygwin64\home\Home\gethweb\node_modules\passport\lib\middleware\authenticate.js:318:9) at SessionStrategy.authenticate (C:\cygwin64\home\Home\gethweb\node_modules\passport\lib\strategies\session.js:67:10) at attempt (C:\cygwin64\home\Home\gethweb\node_modules\passport\lib\middleware\authenticate.js:341:16) at authenticate (C:\cygwin64\home\Home\gethweb\node_modules\passport\lib\middleware\authenticate.js:342:7) 

以下是我的index.js文件的相关部分：

 var express = require('express'); var passport = require('passport'); router = express.Router(); module.exports = function(passport) { router.get('/', function(req, res) { res.render('index', { message: req.flash('message') }); }); router.post('/login', passport.authenticate('login', { successRedirect: '/home', failureRedirect: '/', failureFlash : true })); router.get('/signup', function(req, res) { res.render('register',{message: req.flash('message')}); }); router.post('/signup', passport.authenticate('signup', { successRedirect : '/home', failureRedirect : '/signup', failureFlash : 'true' })); return router; }; 

编辑：

init.js：

 var login = require('./login.js'); var signup = require('./signup.js'); var User = require('../models/user'); module.exports = function(passport) { passport.serializeUser(function(user, done) { console.log('serializing user: '); console.log(user); done(null, user._id); }); passport.deserializeUser(function(id, done) { User.findById(id, function(err, user) { console.log('deserializing user: ', user); done(err, user); }); }); login(passport); signup(passport); } 

和signup.js：

 var LocalStrategy = require('passport-local').Strategy; var User = require('../models/user'); var bCrypt = require('bCrypt-nodejs'); module.exports = function(passport) { passport.use('signup', new LocalStrategy({ passReqToCallback : true }, function(req, username, password, done) { findOrCreateUser = function() { User.findOne({ 'username' : username }, function(err, user) { if (err) { console.log('Error in SignUp: '+err); return done(err); } if (user) { console.log('User already exists with username' + username); return done(null, false, req.flash('message', 'User Already Exists')); } else { var newUser = new User(); newUser.username = username; newUser.password = createHash(password); newUser.email = req.param('email'); newUser.firstName = req.param('firstName'); newUser.lastName = req.param('lastName'); newUser.save(function(err) { if (err) { console.log('Error in Saving user: ' + err); throw err; }; console.log('User Registration successful'); return done(null, newUser); }); } }); }; process.nextTick(findOrCreateUser); }) ); var createHash = function(password) { return bCrypt.hashSync(password, bCrypt.genSaltSync(10), null); } } 

谁能告诉我是什么原因造成的？ 这将非常感激。