如果用户登录， passport.js 将为 req 中的用户对象$ c> express.js ，您可以检查任何中间件的存在：

If user is logged in, passport.js will create user object in req for every request in express.js, which you can check for existence in any middleware:

if (req.user) {
    // logged in
} else {
    // not logged in
}

您可以为此创建简单的 express.js 中间件，这将检查用户是否登录，如果没有，将重定向到 / login 页面：

You can create simple express.js middleware for that, that will check if user is logged in, and if not - will redirect to /login page:

function loggedIn(req, res, next) {
    if (req.user) {
        next();
    } else {
        res.redirect('/login');
    }
}

并使用它：

app.get('/orders', loggedIn, function(req, res, next) {
    // req.user - will exist
    // load user orders and render them
});