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如何使用正确的请求和响应对象调用函数?

node.js javascript

-1

batman · 技术社区 · 7 年前

我有一段代码:

var http = require('http');
function createApplication() {
    let app = function(req,res,next) {
        console.log("hello")
    };

    return app;
}

app = createApplication();

app.listen = function listen() {
    var server = http.createServer(this);
    return server.listen.apply(server, arguments);
};

app.listen(3000, () => console.log('Example app listening on port 3000!'))

这里没什么好奇心。但当我运行此代码并转到 localhost:3000 ,我能看到 hello 正在打印。我不知道这个函数是如何被调用的。此外,函数接收 req 和; res 对象也一样。不知道这里发生了什么。

2 回复 | 直到 7 年前

1

2

Patrick Evans 7 年前

http.createServer() requestListener

https://nodejs.org/api/http.html#http_http_createserver_options_requestlistener

listen() app.listen() this createApplication

http.createServer(function(req,res,next) {
  console.log("hello")
});

var http = require('http');
var server = http.createServer();
server.on('request',function(req,res,next) {
  //callback anytime a request is made
  console.log("hello")
});
server.listen(3000);

2

-1

Narek Hakobyan 7 年前

// content of index.js
const http = require('http')
const port = 3000

const requestHandler = (request, response) => {
  console.log(request)
  response.end('Hello Node.js Server!')
}

const server = http.createServer(requestHandler)

server.listen(port, (err) => {
  if (err) {
    return console.log('something bad happened', err)
  }

  console.log(`server is listening on ${port}`)
})