<head>
<style>
* {
padding: 0;
margin: 0;
}
ul{
list-style: none;
overflow: hidden;
}
ul li{
float: left;
60px;
height: 60px;
margin-left: 30px;
margin-top: 30px;
border: 2px solid #da10a7b6;
}
ul li.active{
border-color:rgb(0, 255, 85);
}
</style>
</head>
<body>
<img src="p/01.jpg" id="bigImg" width="400px" height="400px">
<ul>
<li class="active">
<a href="">
<img src="p/02.jpg" width="46" class="smallImg">
</a>
</li>
<li>
<a href="">
<img src="p/03.jpg" width="46" class="smallImg">
</a>
</li>
<li>
<a href="">
<img src="p/04.jpg" width="46" class="smallImg">
</a>
</li>
<li>
<a href="">
<img src="p/05.jpg" width="46" class="smallImg">
</a>
</li>
</ul>
<script>
// 1.获取事件源
var bigImg = document.getElementById('bigImg');
var smallImgs = document.getElementsByClassName('smallImg');
for (var i = 0; i < smallImgs.length; i++) {
// 遍历集合，给每个img标签添加事件
smallImgs[i].onmouseover = function () {
// 将悬浮的每个li标签类名置为空
for (var j = 0; j < smallImgs.length; j++) {
smallImgs[j].parentNode.parentNode.setAttribute('class', '');
}
// 修改大图src属性
var smallImgSrc = this.getAttribute('src');
bigImg.setAttribute('src', smallImgSrc);
// 给鼠标悬浮的img标签中的父标签添加类
this.parentNode.parentNode.setAttribute('class', 'active');
}
}
</script>