不知道为什么出现不了箭头的切换。很头疼啊
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>lunbo</title>
<style type="text/css">
*{margin:0;padding:0;text-decoration: none;}
#container{width:600px;height:400px;position:relative;border:1px solid red;overflow: hidden;}
.list{position:absolute;z-index:1;width:3000px;height:400px;}
.list img{float:left;width:600px;height:400px;}
.buttons{position:absolute;width:80px;height:8px;bottom:20px;left:250px;z-index:2;}
.buttons span{float:left;border:1px solid #fff;width:10px;height:8px;border-radius:50%;background:#333;margin-left:4px;}
.buttons .on{background: orangered;}
.arrow{position:absolute;color:#fff;
border:1px solid red;
width:40px;height:40px;
font-size:39px;line-height:40px;
font-weight:bold;
text-align:center;display:none;
background-color: RGBA(0,0,0,.3);
z-index:2;
top:180px;}
.arrow:hover{background-color: RGBA(0,0,0,.7)}
#container:hover .arrow{display:block;}
#prev{left:20px;}
#next{right:20px;}
</style>
<script type="text/javascript">
window.onload=function(){
var container=document.getElementById('container');
var list=document.getElementById('list');
var buttons=document.getElementById('buttons').getElementsByTagName('span');
var prev=document.getElementById('prev');
var next=document.getElementById('next');
function animate(offset){
list.style.left=parseInt(list.style.left)+offset+'px';
}
next.onclick=function(){
animate(-600);
}
prev.onclick=function(){
animate(600);
}
}
</script>
</head>
<body>
<div id="container">
<div class="list" style="left:-600px;">
<img src="images/27.jpg" alt=""/>
<img src="images/33.jpg" alt=""/>
<img src="images/32.jpg" alt=""/>
<img src="images/28.jpg" alt=""/>
<img src="images/29.jpg" alt=""/>
</div>
<div class="buttons">
<span index="1" class="on"></span>
<span index="2"></span>
<span index="3"></span>
<span index="4"></span>
<span index="5"></span>
</div>
<a href="javascript:;" class="arrow"id="prev"><</a>
<a href="javascript:;" class="arrow" id="next">></a>
</div>
</body>
