如何在Express.js 4.* 的大量模板中访问req.session？
架构是Node.js 4.* + Express 4.13, 使用的模板是 Nunjucks。我知道可以通过在每个具体的routes中通过将 req.session 传递进 res.render 函数，可以使得模板访问 session：
router.get('/', function(req, res, next) {
res.render('index', {
session: req.session
});
});
但是这样的量太大了，重复代码太多。每个 render 方法多要这样传递一次。请问除此之外，如何在所有的模板中可以访问到 req.session ？
狂気D優曇華院
8 years, 7 months ago
Answers
擦，又是自问自答了。。。
解决方案参考： ExpressJS exposing variables and session to Jade templates
然后顺着这个文章，看Express.js 4.* 的API文档，如下介绍：
res.locals
An object that contains response local variables scoped to the request, and therefore available only to the view(s) rendered during that request / response cycle (if any). Otherwise, this property is identical to app.locals.
This property is useful for exposing request-level information such as the request path name, authenticated user, user settings, and so on.
示例代码：
app.use(function(req, res, next){
res.locals.user = req.user;
res.locals.authenticated = ! req.user.anonymous;
next();
});
对于我具体提问的情形，在所有的路由代码之前，加入该代码：
app.use(function(req, res, next){
res.locals.session = req.session;
next();
});
然后就可以在模板里面直接访问
session
了。
绝对领域我最爱
answered 8 years, 7 months ago