jquery 注册页面源码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注册页面</title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <style>
        .error {
            color: red;
        }
    </style>
</head>
<body>
    <form id="registerForm">
        <div>
            <label for="username">用户名:</label>
            <input type="text" id="username" name="username">
            <span class="error" id="usernameError"></span>
        </div>
        <div>
            <label for="password">密码:</label>
            <input type="password" id="password" name="password">
            <span class="error" id="passwordError"></span>
        </div>
        <div>
            <label for="email">邮箱:</label>
            <input type="email" id="email" name="email">
            <span class="error" id="emailError"></span>
        </div>
        <button type="submit">注册</button>
    </form>

    <script>
        $(document).ready(function() {
            $('#registerForm').on('submit', function(event) {
                event.preventDefault(); // 阻止表单默认提交行为

                let isValid = true;
                const username = $('#username').val();
                const password = $('#password').val();
                const email = $('#email').val();

                // 用户名验证
                if (username.length < 4) {
                    $('#usernameError').text('用户名至少需要4个字符');
                    isValid = false;
                } else {
                    $('#usernameError').text('');
                }

                // 密码验证
                if (password.length < 6) {
                    $('#passwordError').text('密码至少需要6个字符');
                    isValid = false;
                } else {
                    $('#passwordError').text('');
                }

                // 邮箱验证
                const emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
                if (!emailPattern.test(email)) {
                    $('#emailError').text('请输入有效的邮箱地址');
                    isValid = false;
                } else {
                    $('#emailError').text('');
                }

                // 如果验证通过，则提交表单
                if (isValid) {
                    // 这里可以添加Ajax请求将数据发送到服务器
                    console.log('表单验证通过，可以提交数据');
                }
            });
        });
    </script>
</body>
</html>