代码实现：
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
ul {
list-style: none;
}
body {
background: #000;
}
.wrap {
margin: 100px auto 0;
630px;
height: 394px;
padding: 10px 0 0 10px;
background: #000;
overflow: hidden;
border: 1px solid #fff;
}
.wrap li {
float: left;
margin: 0 10px 10px 0;
}
.wrap img {
display: block;
border: 0;
}
</style>
<script src="https://blog-static.cnblogs.com/files/jacklzx/jquery.min.js"></script>
<script>
$(function() {
//鼠标进入的时候,其他的li标签透明度：0.3
$(".wrap li").hover(function() {
$(this).siblings().stop().fadeTo(200, 0.3);
}, function() {
// 鼠标离开，其他li 透明度改为 1
$(this).siblings().stop().fadeTo(200, 1);
});
});
</script>
</head>
<body>
<div class="wrap">
<ul>
<li>
<a href="#"><img src="https://s1.ax1x.com/2020/10/16/07bsG4.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="https://s1.ax1x.com/2020/10/16/07briF.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="https://s1.ax1x.com/2020/10/16/07bBIU.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="https://s1.ax1x.com/2020/10/16/07b0aT.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="https://s1.ax1x.com/2020/10/16/07baq0.jpg" alt="" /></a>
</li>
<li>
<a href="#"><img src="https://s1.ax1x.com/2020/10/16/07bwZV.jpg" alt="" /></a>
</li>
</ul>
</div>
</body>
</html>