```
<html>
<head>
<meta charset="utf-8">
<title></title>
CSS代码
<style type="text/css">
*{
margin: 0px;padding: 0px;
}
#main{
width: 300px;
height: 350px;
}
img{
width: 300px;
height: 300px;
}
#box div{
display: none;
}
li{
list-style-type: none;
}
#oul li{
float: left;
width: 75px;
text-align: center;
height: 50px;
line-height: 50px;
overflow: hidden;
}
.a{
background-color: #5F9EA0;
}
</style>
<script src="../jquery-3.4.1.min.js" type="text/javascript" charset="utf-8"></script>
</head>
<body>
HTML代码
<div id="main">
<ul id="oul">
<li class="a">汤姆1</li>
<li>汤姆2</li>
<li>汤姆3</li>
<li>汤姆4</li>
</ul>
<div id="box">
<div style="display: block;"><img src="imges/tm1.jpg" ></div>
<div><img src="imges/tm2.jpg" ></div>
<div><img src="imges/tm3.jpg" ></div>
<div><img src="imges/tm4.jpg" ></div>
</div>
</div>
js代码
<script type="text/javascript">
$(function(){
$('li').mouseover(function(){
$('li').removeClass() //移除类名
$(this).addClass('a') //给当前元素添加类名
$('#box > div').hide().eq($(this).index()).show() //其他兄弟节点隐藏掉 //选择下标显示
})
})
</script>
</body>
</html>
```
