Question

我在做快递路由器。
有一些类似下面的代码。
但是当我运行该文件时，它不起作用。
我认为这部分问题。
这在Koa中有效，但不能表达。
你能给我一些建议吗？

const printInfo = (req) => {
  req.body = {
    method: req.method,
    path: req.path,
    params: req.params,
  };
};

这是连续的代码。

const express = require('express');
const posts = express.Router();

const printInfo = (req) => {
  req.body = {
    method: req.method,
    path: req.path,
    params: req.params,
  };
};

posts.get('/', printInfo);

module.exports = posts;

和

const express = require('express');

const api = express.Router();
const posts = require('./posts');

api.use('/posts', posts);

module.exports = api;

和

const express = require('express');

const app = express();
const api = require('./api/index');

app.use('/api', api);

app.listen(4000, () => {
  console.log('Example app listening on port 4000!');
});

Answer 1

您的中间件错过了next（）调用，并且路由器配置不正确。

按照此示例，这就是我始终将中间件与Expressjs一起使用的方式

middleware.js

// no need to import express/router

module.exports = (req, res, next) => {

  // manipulate your body obj
  req.body = {
    method: req.method,
    path: req.path,
    params: req.params,
  };

  // go to the next function
  next();

}

routes.js

// only import the router
const router = require('express').Router();

// function for /api/posts
router.route('/posts').post( (req, res) => {
    // req.body has been manipulated from the middleware
    // do anything you like and call res
    res.send("...")
});

// other routes

module.exports = router;

server.js

const express = require('express');
const middleware = require('./middleware');
const routes = require('./routes');

const app = express();

// all calls to /api/* execute the middleware first
app.use('/api', middleware);

// execute the other routes functions
app.use('/api', routes);

app.listen(4000, () => {
  console.log('Example app listening on port 4000!');
});

如何使用Express

1 个答案: