node.js:试试express

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npm i express

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const express = require("express");
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const app = express();

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const express = require("express");
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const singers = require("./singers.json").singers;
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const app = express();
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console.log(singers);
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app.get("/singers/:id", (req, res) => {
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  let id = req.params.id;
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  let singer = singers.find((singer) => {
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    if (singer.id == id) {
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      res.send(singer.name);
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    }
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  });
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});
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app.listen(3000, () => {
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  console.log("Server is running on port 3000");
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});

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const express = require("express");
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const fs = require("fs");
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const app = express();
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const path = require("path");
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function recordMiddleware(req, res, next) {
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  let { url, ip } = req;
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  console.log(`用户访问了${url}，IP地址为${ip}`);
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  fs.appendFile(path.resolve(__dirname, "./access.log"), `${url} ${ip}\n`, (err) => {
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    if (err) {
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      console.log(err);
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    }
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  });
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  next();
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}
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function checkcoode(req, res, next) {
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  let { code } = req.query;
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  if (code === "666") next();
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  else res.send("验证码错误");
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}
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app.use(express.static(path.resolve(__dirname, "./")));
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app.use(recordMiddleware);
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//前台首页
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app.get("/home", checkcoode, (req, res) => {
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  res.send("首页你好");
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});
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app.get("/admin", checkcoode, (req, res) => {
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  res.send("后台管理你好");
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});
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app.get("*", (req, res) => {
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  res.send("404 Not Found");
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});
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app.listen(3000, () => {
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  console.log("服务器启动成功，端口号为3000");
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});
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//后台首页

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const express = require("express");
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const app = express();
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const path = require("path");
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app.use((req, res, next) => {
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  let reffer = req.get("Referrer");
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  if (reffer) {
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    let url = new URL(reffer);
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    let hostname = url.hostname;
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    console.log(hostname);
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    if (hostname !== "127.0.0.1") {
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      console.log("not 127");
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      res.status = 404;
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      res.end("Not Found");
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    }
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  }
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  next();
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});
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app.use(express.static(path.resolve(__dirname, "./")));
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app.listen(3000, () => {
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  console.log("Server is running on port 3000");
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});