右侧的按钮不显示-慕课网

右侧的按钮不显示

来源：3-1 箭头切换

越努力越幸运ydq

2016-10-19 20:18

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>焦点图练习1</title>
<style>
*{margin:0px;padding:0px;text-decoration:none;}
body{
padding:20px;
}
#container{
width:600px;
height:400px;
border:3px solid #333;
overflow:hidden;/*为了将多余的部分隐藏*/
position:relative;}
#list{
width:4200px;
height:400px;
position:absolute;
z-index:1;
}
#list img{
float:left;
}
#buttons{
position:absolute;
height:10px;
width:100px;
z-index:2;
bottom:20px;
left:250px;}
#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("prve");
var next=document.getElementById("next");


}
</script>
</head>
<body>
<div id="container">
    <div id="list" style="left:-600px;">
    <img src="images1/5.jpg" alt="1">
    <img src="images1/1.jpg" alt="1">
    <img src="images1/2.jpg" alt="2">
    <img src="images1/3.jpg" alt="3">
    <img src="images1/4.jpg" alt="4">
    <img src="images1/5.jpg" alt="5">
    <img src="images1/1.jpg" alt="5">
    </div>
    <div id="buttons">
    <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">&lt;</a>
         <a href="javascript:;" id="next">&gt;</a>
</div>
</body>
</html>

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