Question

图书馆，例如快递验证和护照为req变量添加方法，如req.assert和req.user。我知道我可以从路线内做到这一点：

app.get('/', (req,res,next) => {
   req.foo = bar;
   next();
}

但是如何从库或外部模块中进行操作？

Answer 1

简而言之：您公开了消费者需要的处理程序功能app.use()。

这是一般方法。请考虑以下模块：

module.exports = function myExtension() {
  return function myExtensionHandler(req, res, next) {
    // This is called for every request - you can extend req or res here
    req.myFun = myFun

    // Make sure to call next() in order to continue the
    // chain of handlers
    return next()
  }
}

function myFun() {
  // My magic function
}

现在，从消费者的角度来看：

const express = require('express')
const myExtension = require('my-extension')
const app = express()

// Here you tell Express to use your extension for incoming requests
app.use(myExtension())
// ...

添加方法req？

1 个答案: