jq自动关闭底部弹出层

<div id="ad" style="z-index:100; position: absolute; bottom: 5px; width: 100%; ">
        <a href="#" target="_blank">
            <img src="https://stats.chinaz.com/gj_g/anweishi.gif" width="100%">
        </a>
    </div>
    <script>
        $(document).ready(function () {
            setTimeout(function () {
                $('#ad').remove();
            }, 5000); // 5000毫秒后删除div
        });
    </script>