jQuery选项卡实现切换图像

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>选项卡</title>
<script src="jquery-3.3.1.min.js"></script>
<style>
*{
margin: 0;
padding: 0;
}
.box{
width: 440px;
height: 500px;
border: 1px solid red;
margin: 50px auto;
}
ul>li{
list-style: none;
width: 110px;
height: 50px;
background: rgb(205, 164, 245);
float: left;
text-align: center;
line-height: 50px;
}
.nav>.current{
background: #f39797;
}
.content>li{
list-style: none;
display: none;
}
img{
width: 440px;
height: 450px;
}
.content>.show{
display: block;
}
</style>
<script>
$(function(){
$(".nav>li").mouseenter(function(){
$(this).addClass("current")
var index = $(this).index()
var img = $(".content>li").eq(index)
img.addClass("show")
})
$(".nav>li").mouseleave(function(){
$(this).removeClass("current")
var index = $(this).index()
var img = $(".content>li").eq(index)
img.removeClass("show")
})
})
</script>
</head>
<body>
<div class="box">
<ul class="nav">
<li class="current">第一张</li>
<li>第二张</li>
<li>第三张</li>
<li>第四张</li>
</ul>
<ul class="content">
<li class="show"><img src="images/第1页.png" alt=""></li>
<li><img src="images/下载 (1).jpg" alt=""></li>
<li><img src="images/心灵捕手_1时22分18秒_4.jpg" alt=""></li>
<li><img src="images/心灵捕手_19分17秒_1.jpg" alt=""></li>
</ul>
</div>
</body>
</html>