jquery上移下移删除

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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>jquery上移下移删除</title>
<script type="text/javascript" src="//code.jquery.com/jquery-latest.js" ></script>
<script type="text/javascript">
$(document).ready(function(){
$(".up").click(function(){
   var onthis = $(this).parent("span").parent("li");
   var getup = $(this).parent("span").parent("li").prev();
   $(getup).before(onthis);
});
$(".down").click(function(){
   var onthis = $(this).parent("span").parent("li");
   var getdown = $(this).parent("span").parent("li").next();
   $(getdown).after(onthis);
});
$(".del").click(function(){
   var onthis = $(this).parent("span").parent("li");
   onthis.remove()
});
});
</script>
</head>
<body>
<ul>
   <li><span>1</span><span id="1"><a href="#" class="up">上移</a> | <a href="#" class="down">下移</a> | <a href="#" class="del">删除</a></span></li>
   <li><span>2</span><span id="2"><a href="#" class="up">上移</a> | <a href="#" class="down">下移</a> | <a href="#" class="del">删除</a></span></li>
   <li><span>3</span><span id="3"><a href="#" class="up">上移</a> | <a href="#" class="down">下移</a> | <a href="#" class="del">删除</a></span></li>
</ul>
</body>
</html>

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