node创建web服务器

// 模块加载
const http = require('http');
const url = require("url");
const fs = require("fs");
// 初始变量声明
const hostname = "127.0.0.1";
const port = 3000;
const server = http.createServer((req, res) => {
    let urlObj = url.parse(req.url);
    let content = "Not Found!!";
    if (fs.existsSync("www" + urlObj.pathname)) {
        content = fs.readFileSync("www" + urlObj.pathname);
    }
    // 返回指定URL的内容
    res.end(content.toString());
});

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