jquery侧边广告

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery侧边广告</title>
    <style>
        #sidebar {
            position: fixed;
            top: 0;
            right: 0;
            width: 200px;
            height: 100%;
            background-color: #f1f1f1;
            padding: 20px;
        }
        #sidebar img {
            width: 100%;
            height: auto;
        }
    </style>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
    <div id="sidebar">
        <img src="ad1.jpg" alt="广告1">
    </div>

    <script>
        $(document).ready(function() {
            setInterval(function() {
                var currentAd = $('#sidebar img').attr('src');
                if (currentAd === 'ad1.jpg') {
                    $('#sidebar img').attr('src', 'ad2.jpg');
                } else {
                    $('#sidebar img').attr('src', 'ad1.jpg');
                }
            }, 3000);
        });
    </script>
</body>
</html>