<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="../lxx.css">
<style>
.list{
display: none;
}
</style>
</head>
<body>
<div class="box">
大大滴
</div>
<ul class="list">
<li>111</li>
<li>111</li>
<li>111</li>
<li>111</li>
<li>111</li>
</ul>
<script src='https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js'></script>
<script>
$('.box').hover(function () {
// 会多次触发，所以加个stop()
$('.list').stop().slideDown();
}, function () {
// out
$('.list').stop().slideUp();
}
);
</script>
</body>
</html>
