简单的js登录页面代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登录页面</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        .login-container {
            border: 1px solid #ccc;
            padding: 20px;
            width: 300px;
            text-align: center;
        }
        input[type="text"], input[type="password"] {
            width: calc(100% - 22px);
            padding: 10px;
            margin-bottom: 10px;
        }
        button {
            width: 100%;
            padding: 10px;
            background-color: #007BFF;
            color: white;
            border: none;
            cursor: pointer;
        }
        button:hover {
            background-color: #0056b3;
        }
    </style>
</head>
<body>
    <div class="login-container">
        <h2>登录</h2>
        <form id="loginForm">
            <input type="text" id="username" placeholder="用户名" required>
            <input type="password" id="password" placeholder="密码" required>
            <button type="submit">登录</button>
        </form>
    </div>

    <script>
        document.getElementById('loginForm').addEventListener('submit', function(event) {
            event.preventDefault(); // 阻止表单默认提交行为

            var username = document.getElementById('username').value;
            var password = document.getElementById('password').value;

            // 这里可以添加与服务器验证的逻辑
            if(username === 'admin' && password === '123456') {
                alert('登录成功！');
                // 可以跳转到其他页面
            } else {
                alert('用户名或密码错误！');
            }
        });
    </script>
</body>
</html>

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

app.use(express.json());

app.post('/login', (req, res) => {
    const { username, password } = req.body;
    if(username === 'admin' && password === '123456') {
        res.status(200).send('登录成功！');
    } else {
        res.status(401).send('用户名或密码错误！');
    }
});

app.listen(3000, () => console.log('服务器运行在 http://localhost:3000'));