此代码创建了一个动态时钟，其中 updateClock 函数会每秒更新一次当前时间，并将其显示在页面上。JavaScript 的 setInterval 函数用于每秒调用 updateClock 函数以更新时钟。以下是一个简单的HTML和JavaScript代码示例，用于在网页上实现动态的时钟：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Dynamic Clock</title>
<style>
#clock {
font-family: Arial, sans-serif;
font-size: 48px;
font-weight: bold;
color: #333;
}
</style>
</head>
<body>
<div id="clock"></div>
<script>
function updateClock() {
var now = new Date();
var hours = now.getHours();
var minutes = now.getMinutes();
var seconds = now.getSeconds();
// Add leading zeros if needed
hours = (hours < 10 ? "0" : "") + hours;
minutes = (minutes < 10 ? "0" : "") + minutes;
seconds = (seconds < 10 ? "0" : "") + seconds;
// Format the time
var timeString = hours + ":" + minutes + ":" + seconds;
// Update the clock element
document.getElementById("clock").innerHTML = timeString;
}
// Update the clock every second
setInterval(updateClock, 1000);
// Initial call to display the clock immediately
updateClock();
</script>
</body>
</html>