为什么在使用 NODEJS 和 EXPRESSJS 通过 RESTAPI 中的参数（ID）向服务器发出请求后我没有收到正确的响应

Question

名为 dishRouter.js 的节点模块为 /dishes/:dishId REST API 端点实现了 Express 路由器。

index.js

const express = require('express');
const http = require('http');
const morgan = require('morgan');
const hostname = 'localhost';
const port = 3000;
const app = express();
const dishRouter = require('./routes/dishRouter');
const bodyParser = require('body-parser');

app.use(morgan('dev'));
app.use(bodyParser.json()); //parse the json in the body
app.use('/dishes/:dishId', dishRouter);
app.use(express.static(__dirname + '/public'));

app.use((req, res, next) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/html');
  res.end('<html><body><h1>This is an express server</h1></body></html');
});

const server = http.createServer(app);

server.listen(port, hostname, () => {
  console.log(`Server running at http://${hostname}:${port}`)
});

dishRouter.js

const express = require('express');
const bodyParser = require('body-parser');
const dishRouter = express.Router();

dishRouter.use(bodyParser.json());
dishRouter.route('/')

  .all((req, res, next) => {
    res.statusCode = 200;
    res.setHeader('Content-Type', 'text/html');
    next();
  })

  .get((req, res, next) => {
    res.end('Will send details of the dish: ' + req.params.dishId + ' to you!');
  })

  .post((req, res, next) => {
    res.write('Updating the dish: ' + req.params.dishId + '\n');
    res.end('Will update the dish: ' + req.body.name +
      ' with details: ' + req.body.description);
  })

  .put((req, res, next) => {
    res.end(req.params.dishId + ' Will update the dishId and dish: ' + req.body.name + 'with details: ' + req.body.description);
  })

  .delete((req, res, next) => {
    res.end('Deleting the dishId: ' + req.params.dishId);
  });

module.exports = dishRouter;

向localhost:3000/dishes/28发送GET请求时，会发送以下响应：

Will send details of the dish: undefined to you!

但是我需要的是Will send details of the dish:28 to you!，我无法解决问题

对于其他方法调用，我也需要相同的响应。

Answer 1

当您将路由器存储在 dishRouter 中时，您需要告诉它从 parents.

继承参数

...
const dishRouter = express.Router({ mergeParams: true });
...

Express document

为什么在使用 NODEJS 和 EXPRESSJS 通过 RESTAPI 中的参数（ID）向服务器发出请求后我没有收到正确的响应

Why I am Not receiving proper respond after giving request to server through parameter(ID) in RESTAPI using NODEJS & EXPRESSJS

javascript

rest

server-response

node.js

express