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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>依依園地</title>
</head>
<body>
<div id="win">
<ul id="picChange">
<li>
<img src="images/01.jpg" title="圖片1"></li>
<li>
<img src="images/02.jpg" title="圖片2"></li>
<li>
<img src="images/03.jpg" title="圖片3"></li>
</ul>
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<script type="text/javascript">
var pic = document.getElementById('picChange');
var picList = pic.getElementsByTagName("li");
alert(picList[0].firstChild);
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>依依園地</title>
</head>
<body>
<div id="win">
<ul id="picChange">
<li><img src="images/bigpic/01.jpg" title="護腰/HY005"></li>
<li><img src="images/bigpic/02.jpg" title="枕頭吊臂/DB-004"></li>
<li><img src="images/bigpic/03.jpg" title="大護腳/HY-001"></li>
</ul>
</div>
<script type="text/javascript">
var pic = document.getElementById('picChange');
var picList = pic.getElementsByTagName("li");
alert(picList[0].firstChild);
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