JavaScript将当前时间转换成UTC标准时间的方法

<!DOCTYPE html>
<html>
<body>
<p id="demo">
Click the button to display the UTC date and time as a string.
</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var d = new Date();
var x = document.getElementById("demo");
x.innerHTML=d.toUTCString();
}
</script>
</body>
</html>