nodejs初识

一、nodejs网络模块的第一个程序

代码语言：javascript复制

const http = require('http');
const hostName = '127.0.0.1';
const port = 3000;

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('hello world');
})

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

二、获取服务路由地址

准备三个文件

server 文件夹 --index.js --router.js --first-serve.js

代码语言：javascript复制

// index.js
const server = require("./first-serve");
const router = require("./router");
server.start(router.route);

代码语言：javascript复制

// router.js
const route = (pathName) => {
  console.log("About to route a request for"   pathName)
}
exports.route = route;

代码语言：javascript复制

// first-serve.js
const http = require('http');
const url = require('url');
const hostName = '127.0.0.1';
const port = 3000;

function start(route) {
  function onRequest(request, response) {
    let pathName = url.parse(request.url).pathname;
    console.log('Request for'   pathName   " received");

    route(pathName);

    response.writeHead(200, { "Content-Type": "text/plain" });
    response.write("Hello World");
    response.end();
  }
  http.createServer(onRequest).listen(port, hostName);
  console.log("Serve has started.")
}

exports.start = start;

用 url.parse(request.url).pathname 获取到路由地址

用node index.js 启动服务,可以看到控制台打印：

// Serve has started.

然后在浏览器输入 http://127.0.0.1:3000/user 访问，我们可以看到打印以下信息

代码语言：javascript复制

// Request for/user received
// About to route a request for/user
// Request for/favicon.ico received
// About to route a request for/favicon.ico

写在最后

我是 AndyHu，目前暂时是一枚前端搬砖工程师。

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