实例
<!DOCTYPE html>
<html>
<head>
<title>轮播图</title>
<meta charset="utf-8">
<style type="text/css">
*{margin:0;padding:0;}
.main{
width:800px;
height:1200px;
margin:20px auto;
background: #ccc;
}
.pic{
width: 500px;
height:300px;
margin:0 auto;
overflow: hidden;
position: relative;
}
.pic img{
width: 500px;
height:300px;
}
.pic_span{
position:absolute;bottom:0;left:0;
width: 500px;
text-align: center;
}
.pic span{
color:#fff;
display: inline-block;
cursor:pointer;
z-index: 999;
}
</style>
</head>
<body>
<div class="main">
<div class="pic">
<a href="" target="_blank"><img src="static/images/1.jpg"></a>
<a href="" target="_blank"><img src="static/images/2.jpg"></a>
<a href="" target="_blank"><img src="static/images/3.jpg"></a>
<a href="" target="_blank"><img src="static/images/4.jpg"></a>
<a href="" target="_blank"><img src="static/images/5.jpg"></a>
<div class="pic_span">
<span onclick="wheel(0)">1</span>
<span onclick="wheel(1)">2</span>
<span onclick="wheel(2)">3</span>
<span onclick="wheel(3)">4</span>
<span onclick="wheel(4)">5</span>
</div>
</div>
</div>
<script type="text/javascript">
function wheel(num){
var pic_a=document.getElementsByClassName('pic')[0].getElementsByTagName('a');
for(i=0;i<pic_a.length;i++){
pic_a[i].style.display="none";
}//for循环用来遍历出所有的a标签，并且将它们全部隐藏
pic_a[num].style.display="block";//点击时，使对应的a元素显示，num的值是就是a元素下标的值
}
</script>
</body>
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