​x
 
<!DOCTYPE html>
<html>
<body>
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<p>单击按钮可在更改秒和毫秒后显示它们。</p>
​
<button onclick="myFunction()">试一试</button>
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<p id="demo"></p>
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<script>
function myFunction() {
  var d = new Date();
  d.setUTCSeconds(35, 825);
  var s = d.getUTCSeconds();
  var ms = d.getUTCMilliseconds();
  var x = document.getElementById("demo");
  x.innerHTML = s + ":" + ms;
}
</script>
​
</body>
</html>
​