js登陆用户名密码

document.getElementById('loginForm').addEventListener('submit', function(event) {
    const username = document.getElementById('username').value;
    const password = document.getElementById('password').value;

    if (!username || !password) {
        alert('用户名和密码不能为空');
        event.preventDefault();
    }
});

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

app.use(express.json());

app.post('/login', async (req, res) => {
    const { username, password } = req.body;

    // 假设从数据库中获取用户信息
    const user = await getUserFromDatabase(username);

    if (user && await bcrypt.compare(password, user.passwordHash)) {
        // 生成JWT
        const token = generateJWT(user);
        res.json({ token });
    } else {
        res.status(401).json({ message: '用户名或密码错误' });
    }
});

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

const jwt = require('jsonwebtoken');

function generateJWT(user) {
    return jwt.sign({ id: user.id, username: user.username }, 'your-secret-key', { expiresIn: '1h' });
}