<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html lang="ja">
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>Sample</title>
<link rel="stylesheet" href="resource/css/ext-all.css" type="text/css" media="all">
<link rel="stylesheet" href="resource/css/main.css" type="text/css" media="all">
<script type="text/javascript" src="js/ext-base.js"></script>
<script type="text/javascript" src="js/ext-all.js"></script>
<script type="text/javascript"><!--
function checkDate(){
var cDate = new Date();
var lastDay = cDate.getLastDateOfMonth();
Ext.get("result").dom.innerHTML = "今月の最終日は"+lastDay.getDate()+"日です";
}
// --></script>
</head>
<body>
<h1>今月の最終日を求める</h1>
<form>
<input type="button" value="調べる" onClick="checkDate()">
</form>
<div id="result">---</div>
</body>
</html>