​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>单击该按钮可根据 UTC 显示星期几。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var d = new Date();
  var n = d.getUTCDay();
  document.getElementById("demo").innerHTML = n;
}
</script>
​
<p><strong>Note:</strong> 0=Sunday, 1=Monday, etc.</p>
​
</body>
</html>
​