摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>自定义动画三级导航栏</title>
<script src="/jQuery/jQuery-3.3.1.js"></script>
<script>
$(function(){
$('.box-3').hide();
$('.box-2').hide();
$('.box-1>li').mouseover(function(){
$(this).find('.box-2').slideDown(500)
})
$('.box-1>li').mouseleave(function(){
$(this).find('.box-2').slideUp(500)
})
$('.box-2>li').mouseover(function(){
$(this).find('.box-3').slideDown(500)
})
$('.box-2>li').mouseleave(function(){
$(this).find('.box-3').slideUp(500)
})
})
</script>
<style>
*{margin: 0px;padding: 0px;}
a{text-decoration: none;color:cornflowerblue;}
.nav a:hover{color: cornsilk;}
.cont{margin: 50px;}
ul{list-style: none;}
li{height: 40px;width: 100px;text-align: center;line-height: 40px;background:#ccc;;border-bottom: 1px dashed red;border-radius: 5px;margin: 2px;}
</style>
</head>
<body>
<div class="cont">
<div class="nav">
<ul class="box-1">
<li><a href="#">首页</a></li>
<li style="position: relative;"><a href="#">产品</a>
<ul class="box-2" style="position:absolute; top:0px; left:100px;">
<li style="position: relative;"><a href="#">汽车</a>
<ul class="box-3" style="position:absolute; top:0px; left:100px;">
<li><a href="#">汽车一</a></li>
<li><a href="#">汽车二</a></li>
<li><a href="#">汽车三</a></li>
</ul>
</li>
<li><a href="#">配件</a></li>
</ul>
</li>
<li><a href="#">关于我们</a></li>
<li><a href="#">加入我们</a></li>
</ul>
</div>
</div>
</body>
</html>
问题：有没有办法在动画没有结束的时候不再次触发！用if判断吗？
批改老师：灭绝师太批改时间：2019-01-14 11:51:23
老师总结：你可以使用stop()停止动画，鼠标移出停止当前动画效果；
