<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<!-- 引入jQuery -->
<script src="../js/jquery-1.4.3.js" type="text/javascript"></script>
<script type="text/javascript">
$(function(){
var $s =$("#test>div");
var $t = $("#test div");
alert($s.length);//获取子节点 3
alert($t.length);//获取子节点及其下属的子节点 5
})
</script>
</head>
<body>
<div id="test">
<div id="test1">
<div id="test11">
<div id="test111">
</div>
</div>
</div>
<div id="test2">
</div>
<div id="test3">
</div>
</div>
</body>
</html>
</span>
