BASE64多层嵌套解码

解题思路※

<script>
        document.getElementById('loginForm').addEventListener('submit', function(e) {
            const correctPassword = "SXpVRlF4TTFVelJtdFNSazB3VTJ4U1UwNXFSWGRVVlZrOWNWYzU=";
            
            function validatePassword(input) {
                let encoded = btoa(input);
                encoded = btoa(encoded + 'xH7jK').slice(3);
                encoded = btoa(encoded.split('').reverse().join(''));
                encoded = btoa('aB3' + encoded + 'qW9').substr(2);
                return btoa(encoded) === correctPassword;
            }

            const enteredPassword = document.getElementById('password').value;
            const messageElement = document.getElementById('message');
            
            if (!validatePassword(enteredPassword)) {
                e.preventDefault();
                messageElement.textContent = "Login failed! Incorrect password.";
                messageElement.className = "message error";
            }
        });
    </script>