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>
<script>
function displayResult(){
	var x=document.getElementById("button1").form.id;
	alert(x);
}
</script>
</head>
<body>

<form id="form1">
<input type="button" onclick="displayResult()" value="显示包含按钮的表单id" id="button1">
</form>

</body>
</html>
              