<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Untitled Document</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
<style type="text/css">
div, span, p {
140px;
height: 140px;
margin: 5px;
background: #aaa;
border: #000 1px solid;
float: left;
font-size: 17px;
font-family: Verdana;
}
div.mini {
55px;
height: 55px;
background-color: #aaa;
font-size: 12px;
}
div.hide {
display: none;
}
</style>
<script type="text/javascript" src="jquery-1.7.2.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#btn1").click(function(){
//选取子元素, 需要在选择器前添加一个空格.
$("div.one :nth-child(2)").css("background", "#ffbbaa");
});
$("#btn2").click(function(){
$("div.one :first-child").css("background", "#ffbbaa");
});
$("#btn3").click(function(){
$("div.one :last-child").css("background", "#ffbbaa");
});
$("#btn4").click(function(){
$("div.one :only-child").css("background", "#ffbbaa");
});
});
</script>
</head>
<body>
<input type="button" value="选取每个class为one的div父元素下的第2个子元素." id="btn1"/>
<input type="button" value="选取每个class为one的div父元素下的第一个子元素." id="btn2"/>
<input type="button" value="选取每个class为one的div父元素下的最后一个子元素." id="btn3"/>
<input type="button" value="如果class为one的div父元素下的仅仅只有一个子元素，那么选中这个子元素." id="btn4"/>
<br><br>
<div class="one" id="one">
id 为 one,class 为 one 的div
<div class="mini">class为mini</div>
</div>
<div class="one" id="two" title="test">
id为two,class为one,title为test的div
<div class="mini" title="other">class为mini,title为other</div>
<div class="mini" title="test">class为mini,title为test</div>
</div>
<div class="one">
<div class="mini">class为mini</div>
<div class="mini">class为mini</div>
<div class="mini">class为mini</div>
<div class="mini"></div>
</div>
<div class="one">
<div class="mini">class为mini</div>
<div class="mini">class为mini</div>
<div class="mini">class为mini</div>
<div class="mini" title="tesst">class为mini,title为tesst</div>
</div>
<div style="display:none;" class="none">style的display为"none"的div</div>
<div class="hide">class为"hide"的div</div>
<div>
包含input的type为"hidden"的div<input type="hidden" value="123456789" size="8">
</div>
<div id="mover">正在执行动画的div元素.</div>
</body>
</html>