abstract：<!DOCTYPE html> <html> <head> <title>二级菜单和下滑线跟随导航</title> <meta charset="utf-8"/> <script type="text/javascript" src=&quo
<!DOCTYPE html>
<html>
<head>
<title>二级菜单和下滑线跟随导航</title>
<meta charset="utf-8"/>
<script type="text/javascript" src="jquery.js"></script>
<style type="text/css">
*{padding:0;margin:0;}
ul {list-style: none;z-index:20;position:relative;font-size: 15px;}
li {float:left;cursor:pointer;width:100px;height: 30px; background: #3162CC; text-align:center;line-height:30px;color: #fff;font-weight: bold;}
#nav1 li {margin-top: 2px; background: red;}
.nav{width:500px;position:relative;margin:20px auto;height:32px;box-shadow: 0 2px 20px #000;background: #3162CC;border-radius:3px }
</style>
<script type="text/javascript">
$(function(){
$('li').hover(
function(){
$x=parseInt($(this).attr('name'))*100
$('.block').stop().animate({left:$x+'px'},300)
},
function(){
$('.block').stop().animate({left:'0px'},300)
}
)
})
$(document).ready(function () {
$('#nav1').hide()
$('#nav0>li').mouseover(function(){
$(this).find('#nav1').slideDown(500)
})
$('#nav0>li').mouseleave(function(){
$(this).find('#nav1').slideUp(500)
})
})
</script>
</head>
<body>
<div class="nav">
<ul id="nav0">
<li name="0">首页</li>
<li name="1">公司概况
<ul id="nav1">
<li>二级菜单1</li>
<li>二级菜单2</li>
<li>二级菜单3</li>
</ul>
</li>
<li name="2">公司新闻</li>
<li name="3">机构导航</li>
<li name="4">联系我们</li>
</ul>
<div class="block" style="z-index:10;width:100px;height:2px;background:#fff;position:absolute;top:30px;"></div>
</div>
</body>
</html>
老师，我这个二级菜单slideDown的时候会突然结束，这个该怎么解决啊？
Correcting teacher：天蓬老师Correction time：2018-12-20 16:39:06
Teacher's summary：jQuery中的这些基本的简单动画 , 是复杂动画的基础