HTML 实时显示本地电脑时间（精确到毫秒）

<!DOCTYPE html>
<html>
<head>
    <title>实时显示本地电脑时间（精确到毫秒）</title>
</head>
<body>
    <h1>本地电脑时间（精确到毫秒）：</h1>
    <h1 id="clock"></h1>

    <script>
        function updateClock() {
            const now = new Date();
            const year = now.getFullYear();
            const month = String(now.getMonth() + 1).padStart(2, '0');
            const day = String(now.getDate()).padStart(2, '0');
            const hours = String(now.getHours()).padStart(2, '0');
            const minutes = String(now.getMinutes()).padStart(2, '0');
            const seconds = String(now.getSeconds()).padStart(2, '0');
            const milliseconds = String(now.getMilliseconds()).padStart(3, '0');
            
            const timeString = `${year}-${month}-${day} ${hours}:${minutes}:${seconds}   ${milliseconds}`;
            document.getElementById('clock').textContent = timeString;
        }

        // 每毫秒更新一次时间
        setInterval(updateClock, 1);
    </script>
</body>
</html>