js 页面显示8s后关闭

js 页面显示8s后关闭，页面显示秒数

<!DOCTYPE html>
<html lang="zh_CN">
<head>
    <meta charset="UTF-8">
    <title>定时</title>
    <script src="jquery-3.4.1.min.js"></script>
    <script>
        /**
         * 定时8s，页面显示秒数，八秒之后关闭
         */

        let time = 8;
        setInterval(function () {
            if (time <= 0) {
                window.close();
            } else {
                document.getElementById('t').innerText = --time;
            }
        }, 1000)

    </script>
</head>
<body>

<div id="test">
    页面将在<span id="t">8</span>秒后关闭
</div>

</body>
</html>