将变量传递给下一个使用express（）的中间件 [英] passing variables to the next middleware using next() in expressjs

问题描述

我的问题是，我想把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是一个给定的'undefined'。

---

  // app.js 
 .. 
 app.get（'/ someurl /'，middleware1，中间件2）
 ... 
  

---

  //// middleware1 
 ... 
某些条件
 ... 
 res.somevariable = variable1; 
 next（）; 
 ... 
  

---

  //// middleware2 
 ... 
某些条件
 ... 
 variable = req.somevariable; 
 ... 
  

---

感谢您的回答

解决方案

将您的变量附加到 req 对象，而不是 res 。

而不是

  res.somevariable = variable1; 
  

有：

 code> req.somevariable = variable1; 
  

编辑：

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式。

Well my question is I want to pass some variable from 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;
...

---

Thanks for answering.

解决方案

Attach your variable to the req object, not res.

Instead of

res.somevariable = variable1;

Have:

req.somevariable = variable1;

Edit:

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

这篇关于将变量传递给下一个使用express（）的中间件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！