express 4 会话问题

Question

我req.session.UserID = _id;设置完会话之后。在另外一个路由中无法取出，是为神马？求教。

router.get('/', function(req, res, next) {
    var _id = req.query.UserID;
    if(_id){
            req.session.UserID = _id;
    }
    res.render('index', { title: 'Express' });
});

router.get('/about', function(req, res, next) {
    console.log(req,session.UserID);
    res.render('about')
})

console.log(req,session.UserID);输出，结果页面上显示 session is not defined

Answer 1

console.log(req,session.UserID);
朋友你把 . 写成,了