大家帮忙看看以下代码在执行动画的高度收回来的最后一点时为什么有点卡?
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/
html; charset=utf-8" />
<title></title>
<style>
body,div,ul,p,h1,h2,h3.img{ margin:0;padding:0;}
ul li{list-style-type:none;}
a{ font-size: 1.0625em; text-decoration: none; color:#565656;}
#landing{ overflow:hidden;}
.fblod{ color: #fff!important; font-weight:blod!important; background: #76afe0!important;}
ul#landing li{ float:left; width:32.4%; height:36px; line-height: 36px; background: #ebf2f7; color: #2a70be; margin: 0 5px 0 0; text-align:center;}
ul#landing li:nth-child(3){ margin-right: 0;}
ul#landing li:nth-child(4){ width:99.8%; height:136px; display:none; position: relative; padding-top: 26px;}
input,select{display:block; margin: 0 0 10px 20px; width:56%; height:35px;border:1px solid #669fdf; border-radius:5px;}
select{ height: 30px;}
input:nth-child(2){ margin-bottom: 3px;}
input:nth-child(4){ width:70px; height:72px; background-image:linear-gradient(to top,#669fdf,#3177c5); color:white; position:absolute;left:60%;top:66px; }
</style>
<script src="http://libs.baidu.com/jquery/1.9.1/jquery.js"></script>
</head>
<body>
<!--点击展开登陆-->
<ul id="landing">
<li onclick ="changeselect('select','1')">TAB1</li>
<li onClick="changeselect('select','2')">TAB2</li>
<li onClick="changeselect('select','3')">TAB3</li>
<li></li>
</ul>
<script>
$('#landing li:eq(0),#landing li:eq(1),#landing li:eq(2)').click(function(){
$('#landing li:eq(3)').animate({height:'toggle'},1000);
})
</script>
</body>
</html>
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