(Express)如何将一个值从 function 传递给 express.Router().get 中的另一个值

Question

如何将值从 function 传递给 router.get 的另一个值

router.get('/someurl', (req, res, next) => {
const token = req.headers.authorization.split(' ')[1] //jwtToken
const jwt = jwt.verify(
    token,
    jwtSecret
)
...do something to pass value to the next function
}, )

Answer 1

你可以使用res.locals来做到这一点

一个 object 包含范围为请求的响应局部变量，因此仅可用于在该请求/响应周期（如果有）期间呈现的视图。

所以在你的情况下

router.get(
  "/someurl",
  (req, res, next) => {
    const token = req.headers.authorization.split(" ")[1]; //jwtToken
    const jwt = jwt.verify(token, jwtSecret);
    // pass to res.locals so I can get it in next() middleware
    res.locals.token = token;
    next();
  },
  (req, res, next) => {
    // inside the next() middleware
    // get token from res.locals
    const previousToken = res.locals.token;
  }
);