nodejs使用connect-redis怎么设置session

Question

nodejs使用connect-redis怎么设置session？

如果直接

app.use(require('express-session')({    
    resave:false,
    saveUninitialized: true,
    secret: 'lalala',
}));

app.get('/', function (req, res) {
    console.log('session: ', req.session);        
});

是可以得出

session:  Session {
  cookie: 
   { path: '/',
     _expires: null,
     originalMaxAge: null,
     httpOnly: true } }

如果用connect-redis

var session = require('express-session');
var redisStore = require('connect-redis')(session);
app.use(session({
    saveUninitialized: true,
    resave: false,
    secret: 'lalala',
    store: new redisStore({ host: 'localhost', port: 6379}),
}));

得到的是undefined，得不到session

Answer 1

把logErrors设置了发现原来是connect-redis can't connect to Redis.