<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>相册</title>
<style>
*{
margin:0;
padding:0;
}
ul{
list-style: none;
overflow: hidden;
}
ul li{
float: left;
55px;
height: 40px;
margin-top: 10px;
margin-left: 10px;
border: 2px solid #fff;
}
ul li.active{
border-color: red;
}
</style>
</head>
<body>
<img src="img/1.jpeg" id="img">
<ul>
<li>
<a href="">
<img src="img/1.jpeg" width="55px" height="40px" class="small">
</a>
</li>
<li>
<a href="">
<img src="img/2.jpeg" width="55px" height="40px" class="small">
</a>
</li>
<li>
<a href="">
<img src="img/3.jpeg" width="55px" height="40px" class="small">
</a>
</li>
<li>
<a href="">
<img src="img/4.jpeg" width="55px" height="40px" class="small">
</a>
</li>
</ul>
<script>
var big=document.getElementById('img');
var small=document.getElementsByClassName('small');
for(var i=0;i<small.length;i++)
{
small[i].onmouseover=function()
{
for(var j=0;j<small.length;j++)
{
small[j].parentNode.parentNode.setAttribute('class','');
}
var smalls=this.getAttribute('src');
big.setAttribute('src',smalls);
this.parentNode.parentNode.setAttribute('class','active');
}
}
</script>
</body>
</html>