​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>此页面上的脚本启动这个时钟：</p>
​
<p id="demo"></p>
​
<button onclick="clearInterval(myVar)">停止时间</button>
​
<script>
var myVar = setInterval(myTimer ,1000);
function myTimer() {
  var d = new Date();
  document.getElementById("demo").innerHTML = d.toLocaleTimeString();
}
</script>
​
</body>
</html>
​