<!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 weekday = new Array(7);
weekday[0] = "Sunday";
weekday[1] = "Monday";
weekday[2] = "Tuesday";
weekday[3] = "Wednesday";
weekday[4] = "Thursday";
weekday[5] = "Friday";
weekday[6] = "Saturday";
var n = weekday[d.getUTCDay()];
document.getElementById("demo").innerHTML = n;}
</script>
<p><strong>Note:</strong> 0=Sunday, 1=Monday, etc.</p>
</body>
</html>