Nodejs + Mongodblogin示例不起作用
我试着从网站的代码http://code.runnable.com/U108R8ihwn4m4TM5/user-creation-signup-and-login-with-express-4-and-mongodb-for-node-js当我跑
节点server.js
出现以下错误
module.js:340 throw err; ^ Error: Cannot find module 'connect-mongo' at Function.Module._resolveFilename (module.js:338:15) at Function.Module._load (module.js:280:25) at Module.require (module.js:364:17) at require (module.js:380:17) at Object.<anonymous> (/home/amitnaik01/Login/server.js:6:18) at Module._compile (module.js:456:26) at Object.Module._extensions..js (module.js:474:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Function.Module.runMain (module.js:497:10) package.json文件如下：
{ "name": "ExpressApp", "version": "0.0.1", "description": "A Node.js App using express", "dependencies": { "express": "~4.0.0", "body-parser": "~1.0.2", "express-session": "~1.0.3", "express3-handlebars": "~0.5.0", "mongodb": "~1.4.2", "connect-mongo": "git+https://github.com/kcbanner/connect-mongo.git#master", "cookie-parser": "~1.0.1" }, "engine": "node >=0.6.x" }
server.js文件在下面
var express = require('express'); var app = express(); var expressSession = require('express-session'); var expressHbs = require('express3-handlebars'); var mongoUrl = 'mongodb://localhost:27017/dbname'; var MongoStore = require('connect-mongo')(expressSession); var mongo = require('./mongo'); var port = 8000; // for heroku you would use process.env.PORT instead // This is a middleware that we will use on routes where // we _require_ that a user is logged in, such as the /secret url function requireUser(req, res, next){ if (!req.user) { res.redirect('/not_allowed'); } else { next(); } } // This middleware checks if the user is logged in and sets // req.user and res.locals.user appropriately if so. function checkIfLoggedIn(req, res, next){ if (req.session.username) { var coll = mongo.collection('users'); coll.findOne({username: req.session.username}, function(err, user){ if (user) { // set a 'user' property on req // so that the 'requireUser' middleware can check if the user is // logged in req.user = user; // Set a res.locals variable called 'user' so that it is available // to every handlebars template. res.locals.user = user; } next(); }); } else { next(); } } // Use this so we can get access to `req.body` in our posted login // and signup forms. app.use( require('body-parser')() ); // We need to use cookies for sessions, so use the cookie parser middleware app.use( require('cookie-parser')() ); app.use( expressSession({ secret: 'somesecretrandomstring', store: new MongoStore({ url: mongoUrl }) })); // We must use this middleware _after_ the expressSession middleware, // because checkIfLoggedIn checks the `req.session.username` value, // which will not be available until after the session middleware runs. app.use(checkIfLoggedIn); app.engine('hbs', expressHbs({extname:'hbs', defaultLayout:'main.hbs'})); app.set('view engine', 'hbs'); app.get('/', function(req, res){ var coll = mongo.collection('users'); coll.find({}).toArray(function(err, users){ res.render('index', {users:users}); }) }); app.get('/login', function(req, res){ res.render('login'); }); app.get('/logout', function(req, res){ delete req.session.username; res.redirect('/'); }); app.get('/not_allowed', function(req, res){ res.render('not_allowed'); }); // The /secret url includes the requireUser middleware. app.get('/secret', requireUser, function(req, res){ res.render('secret'); }); app.get('/signup', function(req,res){ res.render('signup'); }); // This creates a new user and calls the callback with // two arguments: err, if there was an error, and the created user // if a new user was created. // // Possible errors: the passwords are not the same, and a user // with that username already exists. function createUser(username, password, password_confirmation, callback){ var coll = mongo.collection('users'); if (password !== password_confirmation) { var err = 'The passwords do not match'; callback(err); } else { var query = {username:username}; var userObject = {username: username, password: password}; // make sure this username does not exist already coll.findOne(query, function(err, user){ if (user) { err = 'The username you entered already exists'; callback(err); } else { // create the new user coll.insert(userObject, function(err,user){ callback(err,user); }); } }); } } app.post('/signup', function(req, res){ // The 3 variables below all come from the form // in views/signup.hbs var username = req.body.username; var password = req.body.password; var password_confirmation = req.body.password_confirmation; createUser(username, password, password_confirmation, function(err, user){ if (err) { res.render('signup', {error: err}); } else { // This way subsequent requests will know the user is logged in. req.session.username = user.username; res.redirect('/'); } }); }); // This finds a user matching the username and password that // were given. function authenticateUser(username, password, callback){ var coll = mongo.collection('users'); coll.findOne({username: username, password:password}, function(err, user){ callback(err, user); }); } app.post('/login', function(req, res){ // These two variables come from the form on // the views/login.hbs page var username = req.body.username; var password = req.body.password; authenticateUser(username, password, function(err, user){ if (user) { // This way subsequent requests will know the user is logged in. req.session.username = user.username; res.redirect('/'); } else { res.render('login', {badCredentials: true}); } }); }); app.use('/public', express.static('public')); mongo.connect(mongoUrl, function(){ console.log('Connected to mongo at: ' + mongoUrl); app.listen(port, function(){ console.log('Server is listening on port: '+port); }); })
有没有解决这个错误？
看起来，你的节点模块中缺lessconnect-mongo 。 请安装并保存（将其保存在package.json中是最佳实践）。
npm install connect-mongo --save
或者干脆，
npm i --s connect-mongo
更新
Syntax error是旧节点版本的Syntax error ，请input这些命令来更新Nodejs。
sudo npm cache clean -f sudo npm install -gn sudo n stable
再次安装这个模块。
npm install connect-mongo
将其版本更改为最新版本。