jquery first3 Dom对象操作

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>first-3</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="../js/jquery-1.3.1.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
   var domObj = document.getElementsByTagName("h3")[0]; // Dom对象
   var $jQueryObj = $(domObj); //jQuery对象
   alert("DOM对象："+domObj.innerHTML);
   alert("jQuery对象："+$jQueryObj.html());
});
</script>
</head>
<body>
<h3>例子</h3>
<p title="你学习到那个阶段了." >你学习的阶段为?</p>
<ul>
<li>第一阶段</li>
<li>第二阶段</li>
<li>第三阶段</li>
</ul>
</body>
</html>