在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<body>

<p id="demo">Click the button to display the date after changing the month and day.</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction()
{
var d = new Date();
d.setUTCMonth(4,20);
var x = document.getElementById("demo");
x.innerHTML=d;
}
</script>

</body>
</html>

源代码

动行结果