const http = require("http");
const server = http.createServer();
server.on("request", function (req, res) {
  //  获取请求的url地址
  const url = req.url;
  // 设置默认的响应内容为404 Not found
  let content = "
404 Not found
";
  // 判断用户请求的是否为/ 或/index.html
  // 判断用户请求的是否为/about.html关于页面
  if (url == "/" || url == "/index.html") {
    content = "
首页
";
  } else if (url == "/about.html") {
    content = "
关于页面
";
  }
  // 设置content-type响应头,防止中文乱码
  res.setHeader("content-type", "text/html;charset=utf-8");
  // 使用res.end()把内容响应给客户端
  res.end(content);
});
server.listen(80, () => {
  console.log("server running at http://127.0.0.1");
});

 效果: