在 Express.js 中使用 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

我想将一些变量从第一个中间件传递给另一个中间件，我尝试这样做，但是req.somevariable 被指定为未定义".>

---

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.

代替

res.somevariable = variable1;

有:

req.somevariable = variable1;

正如其他人所指出的，res.locals 是通过中间件传递数据的推荐方式.

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

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