为什么箭头不起作用？急急急！在线等
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>焦点轮播图</title>
<style type="text/css">
*{margin: 0;padding: 0;text-decoration: none;}
body{padding: 20px;}
#container{
width: 600px;height: 400px;border: 3px solid #333;overflow: hidden;position: relative;
}
#list{width: 4200px;height: 400px;z-index: 1;position: absolute;}
#list img{float:left;}
#buttons{height: 10px;width: 100px;z-index: 2;bottom: 20px;left: 250px;position: absolute;}
#buttons span { cursor: pointer; float: left; border: 1px solid #fff; width: 10px; height: 10px; border-radius: 50%; background: #333; margin-right: 5px;}
#buttons .on { background: orangered;}
.arrow{cursor: pointer;display: none;line-height: 39px;text-align: center;font-size: 36px; font-weight: bold; width: 40px; height: 40px; position: absolute; z-index: 2; top: 180px; background-color: RGBA(0,0,0,.3); color: #fff;}
.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');
next.onclick = function(){
list.style.left = parseInt(list.style.left) - 600 + 'px';
}
prev.onclick = function(){
list.style.left = parseInt(list.style.left) + 600+'px';
}
}
</script>
</head>
<body>
<div id="container">
<div id="list">
<img src="images/5.jpg" alt="1"/>
<img src="images/1.jpg" alt="1"/>
<img src="images/2.jpg" alt="2"/>
<img src="images/3.jpg" alt="3"/>
<img src="images/4.jpg" alt="4"/>
<img src="images/5.jpg" alt="5"/>
<img src="images/1.jpg" alt="5"/>
</div>
<div id="buttons" style="left: -600px;">
<span index="1"></span>
<span index="2"></span>
<span index="3"></span>
<span index="4"></span>
<span index="5"></span>
</div>
<a href="javascript:;" id="prev"><</a>
<a href="javascript:;" id="next">></a>
</body>
</html>
qq_眉黛青山_01回答
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JavaScript