菜鸟教程在线编辑器

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

<p id="demo">单击按钮查找按钮是否有onclick属性</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
	var btn=document.getElementsByTagName("BUTTON")[0];
	var x=document.getElementById("demo");
	x.innerHTML=btn.getAttributeNode("onclick").specified;
}

</script>

</body>
</html>
              