js获取浏览器的userid

// 设置cookie
document.cookie = "userid=12345; expires=Fri, 31 Dec 9999 23:59:59 GMT; path=/";

// 获取cookie
function getCookie(name) {
    const value = `; ${document.cookie}`;
    const parts = value.split(`; ${name}=`);
    if (parts.length === 2) return parts.pop().split(';').shift();
}

const userid = getCookie('userid');
console.log(userid); // 输出: 12345

// 设置localStorage
localStorage.setItem('userid', '12345');

// 获取localStorage
const userid = localStorage.getItem('userid');
console.log(userid); // 输出: 12345

// 设置sessionStorage
sessionStorage.setItem('userid', '12345');

// 获取sessionStorage
const userid = sessionStorage.getItem('userid');
console.log(userid); // 输出: 12345

function getFingerprint() {
    const navigatorData = [
        navigator.userAgent,
        navigator.language,
        navigator.platform,
        navigator.vendor,
        screen.width,
        screen.height,
        new Date().getTimezoneOffset()
    ].join('|');
    return btoa(navigatorData); // 简单编码，实际应用中应使用更复杂的哈希算法
}

const userid = getFingerprint();
console.log(userid);

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

app.use(session({
    secret: 'secret-key',
    resave: false,
    saveUninitialized: true
}));

app.get('/', (req, res) => {
    if (!req.session.userid) {
        req.session.userid = generateUserId(); // 自定义函数生成userid
    }
    res.send(`Your userid is: ${req.session.userid}`);
});

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