Javascript 从中间件nodejs传递参数

我需要从next（）将user_name作为参数传递，调用它的函数如下所示

if (token_count == 1) {
    var user_name = rows[0].user_name;
    next();
} else {
    data = {
        message :"Invalid Token"
    }
    res.send(data);
}

---

您可以向req对象添加数据

router.post('/dashboard', function (req, res) {
    // user_name must be fetched here
    console.log("middleware next")
});

---

我用res.locals res.locals.user\u name=user\u name解决了这个问题；

if (token_count == 1) {
          var user_name = rows[0].user_name;
          req.user_name = user_name; 
            next();
        }else{
          data = {
            message :"Invalid Token"
          }
          res.send(data);
        }


    router.post('/dashboard', function (req, res) {
    // user_name must be fetched here
    console.log(req.user_name)
    });