NodeJs Passport 身份验证（无法登录）

Question

我一直在关注Coursera for NodeJs的服务器端教程，问题是我可以使用邮递员（http://localhost:3000/users/signup）注册并且注册成功，但是每当我想登录 (http://localhost:3000/users/login) 我收到一条错误消息：“Unknown authentication strategy 'local'” at ...\passport\lib\middleware\authenticate.js:190:39。

authenticate.js:

var passport = require('passport');
var LocalStrategy = require('passport-local').Strategy;
var User = require('./models/user');



exports.local = passport.use(new LocalStrategy(User.authenticate()));
passport.serializeUser(User.serialize());
passport.deserializeUser(User.deserialize());

users.js：

var express = require('express');
var router = express.Router();
const bodyParser = require('body-parser');
var User = require('../models/user');
var passport = require('passport');

router.use(bodyParser.json());

/* GET users listing. */
router.get('/', function(req, res, next) {
  res.send('respond with a resource');
});

router.post('/signup', (req, res, next) => {
    User.register(new User({username: req.body.username}),
        req.body.password, (err, user) => {
            if(err) {
                res.statusCode = 500;
                res.setHeader('Content-Type', 'application/json');
                res.json({err: err});
            }
            else {
                passport.authenticate('local')(req, res, () => {
                    res.statusCode = 200;
                    res.setHeader('Content-Type', 'application/json');
                    res.json({success: true, status: 'Registration Successful!'});
                });
            }
        });
});

router.post('/login', passport.authenticate('local'), (req, res) => {
    res.statusCode = 200;
    res.setHeader('Content-Type', 'application/json');
    res.json({success: true, status: 'You are successfully logged in!'});
});

router.get('/logout', (req, res) => {
  if (req.session) {
    req.session.destroy();
    res.clearCookie('session-id');
    res.redirect('/');
  }
  else {
    var err = new Error('You are not logged in!');
    err.status = 403;
    next(err);
  }
});

module.exports = router;

app.js：

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
const mongoose = require('mongoose');
const Menu = require('./models/menu');
var session = require('express-session');
var FileStore = require('session-file-store')(session);
var passport = require('passport');

const url = 'mongodb://localhost:27017/lebEats';
const connect = mongoose.connect(url,{useNewUrlParser: true});
connect.then((db) => {
  console.log("Connected correctly to server");
}, (err) => { console.log(err); });

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var menuRouter = require('./routes/menuRouter');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(express.static(path.join(__dirname, 'public')));

//app.use(cookieParser('12345-67890-09876-54321'));

app.use(session({
  name: 'session-id',
  secret: '12345-67890-09876-54321',
  saveUninitialized: false,
  resave: false,
  store: new FileStore()
}));

app.use(passport.initialize());
app.use(passport.session());

app.use('/', indexRouter);
app.use('/users', usersRouter);

function auth (req, res, next) {
  console.log(req.user);

  if (!req.user) {
    var err = new Error('You are not authenticated!');
    err.status = 403;
    next(err);
  }
  else {
    next();
  }
}

app.use(auth);




app.use('/platters',menuRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;

提前谢谢各位！