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");
  }

//session
app.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();
});