使用Express.js中的next（）将变量传递给下一个中间件 [英] Passing variables to the next middleware using next() in Express.js

问题描述

好吧，我的问题是我想将一些变量从第一个中间件传递到另一个中间件，我尝试这样做，但是有 req.somevariable 是一个给定为'undefined'。

Well, my question is I want to pass some variable from the first middleware to another middleware, and I tried doing this, but there was "req.somevariable is a given as 'undefined'".

//app.js
..
app.get('/someurl/', middleware1, middleware2)
...

---

---

////middleware1
...
some conditions
...
res.somevariable = variable1;
next();
...

---

---

////middleware2
...
some conditions
...
variable = req.somevariable;
...

推荐答案

将变量附加到 req 对象，而不是 res 。

Attach your variable to the req object, not res.

而不是

res.somevariable = variable1;

有：

req.somevariable = variable1;

正如其他人所指出的那样， res.locals 是通过中间件传递数据的推荐方法。

As others have pointed out, res.locals is the recommended way of passing data through middleware.

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