Express+Nodejs 下的登录拦截实现代码

app.get('/show', controllers.checkLogin);//登录验证app.get('/show', controllers.showList);//实际跳转

if (!req.session.user) {    return res.redirect("/login");  }

//sessionapp.use(function (req, res, next) {  var err = req.flash('error');  var success = req.flash('success');  res.locals({    user:req.session.user,    navSide:req.session.navSide,    error:err.length ? err : null,    success:success.length ? success : null  });  next();});

//登录拦截器app.use(function (req, res, next) {  var url = req.originalUrl;  if (url != "/login" && !req.session.user) {    return res.redirect("/login");  }  next();});