Express 框架是一个快速、开放、极简的 web 应用开发框架，用于构建灵活和强大的 web 应用和 API。它是 Node.js 平台上最流行的框架之一，因为它提供了一套丰富的功能来简化和加速 web 开发过程。

使用

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npm i express

引入头

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

样例

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const express = require('express');
const singers = require('./singers.json').singers;
const app = express();

console.log(singers);

app.get('/singers/:id', (req, res) => {
let id = req.params.id;
let singer = singers.find(singer => {
    if(singer.id == id){
        res.send(singer.name);
    }
});
});

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});

验证

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const express = require('express');
const fs = require('fs');
const app = express();
const path = require('path');

function recordMiddleware(req,res,next){
    let {url,ip} =req;
    console.log(`用户访问了${url}，IP地址为${ip}`);
    fs.appendFile(path.resolve(__dirname, './access.log'), `${url} ${ip}\n`, (err) => {
      if (err) {
        console.log(err);
      }
    });
    next();
}

function checkcoode(req,res,next){
    let {code} = req.query;
    if(code === '666')
        next();
    else
        res.send('验证码错误');
}
app.use(express.static(path.resolve(__dirname, './')));
app.use(recordMiddleware);

//前台首页
app.get('/home', checkcoode, (req, res) => {
  res.send('首页你好');
});


app.get('/admin', checkcoode, (req, res) => {
    res.send('后台管理你好');
  });

app.get('*', (req, res) => {
    res.send('404 Not Found');
});
app.listen(3000, () => {
  console.log('服务器启动成功，端口号为3000');
});
//后台首页

防盗链

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const express = require('express');
const app = express();
const path = require('path');

app.use((req, res, next) => {
    let reffer = req.get('Referrer');
    if(reffer){
        let url = new URL(reffer);
        let hostname = url.hostname;
        console.log(hostname);
        if(hostname !== '127.0.0.1'){
            console.log('not 127');
            res.status = 404;
            res.end('Not Found');
        }
    }
    next();
})

app.use(express.static(path.resolve(__dirname, './')));

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});