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<!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>
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