名为 dishRouter.js 的 Node 模块为 /dishes/:dishId REST API 端点实现 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!
但我需要的是将菜品的详细信息:28发送给你!，而我无法解决这个问题。
我还需要对其他方法调用做出相同的响应。
最佳答案
当您将 Router 存储在 dishRouter 中时，您需要告诉它从父级继承参数。
...
const dishRouter = express.Router({ mergeParams: true });
...
关于javascript - 为什么我在使用 NODEJS 和 EXPRESSJS 通过 RESTAPI 中的参数(ID)向服务器发出请求后没有收到正确的响应，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59334228/