<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Examples</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
<script src="http://libs.baidu.com/jquery/1.8.2/jquery.min.js"></script>
<style>
.demo li{line-height: 30px;border-bottom: 1px solid #000;}
.demo li a{padding: 0 20px;}
</style>
</head>
<body>
<ul class="demo">
<li>001 <a href="#" class="up">上移</a><a href="#" class="down">下移</a><a href="#" class="top">置顶</a><a href="#" class="bottom">置底</a></li>
<li>002 <a href="#" class="up">上移</a><a href="#" class="down">下移</a><a href="#" class="top">置顶</a><a href="#" class="bottom">置底</a></li>
<li>003 <a href="#" class="up">上移</a><a href="#" class="down">下移</a><a href="#" class="top">置顶</a><a href="#" class="bottom">置底</a></li>
<li>004 <a href="#" class="up">上移</a><a href="#" class="down">下移</a><a href="#" class="top">置顶</a><a href="#" class="bottom">置底</a></li>
</ul>
<script>
$(".demo").on('click', 'a', function(event) {
event.preventDefault;
var parent=$(this).parent();
var parents=$(this).parents(".demo");
var len=parents.children().length;
if(($(this).is(".up") || $(this).is(".top")) && parent.index()==0){
alert("已经置顶！");
return false;
}else if(($(this).is(".down") || $(this).is(".bottom")) && parent.index()==len-1){
alert("已经置底！");
return false;
}
switch (true) {
case $(this).is(".up"):
var prev = parent.prev();
parent.insertBefore(prev);
break;
case $(this).is(".down"):
var next = parent.next();
parent.insertAfter(next);
break;
case $(this).is(".top"):
parents.prepend(parent);
break;
case $(this).is(".bottom"):
parents.append(parent);
break;
}
alert("操作完成！！");
});
</script>
</body>
</html>