菜鸟教程在线编辑器

 
                <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>

<p id="demo">返回当前时间的毫秒数：</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
	const currentTime = Date.now();
	var x = document.getElementById("demo");
	x.innerHTML = currentTime;
}
</script>

</body>
</html>
              