js轮播图透明度切换（带上下页和底部圆点切换）

效果图：

代码如下：

 
 
 
 
 *{
 margin:0;
 padding:0;
 border:none;
 }
 li{
 list-style: none;
 }
 #box{
 height:340px;
 width:790px;
 position: relative;
 margin:100px auto;

 }
 #box #list1{
 height:340px;
 width:790px;

 }
 #box #list1 li{
 font-size: 80px;
 line-height: 340px;
 text-align: center;
 height:340px;
 width:790px;
 position: absolute;
 left:0;
 top:0;
 opacity: 0;
 filter: alpha(opacity=0);
 }
 #box #list1 li img{
 height:340px;
 width:790px;
 }
 #shang,#xia{
 height:80px;
 width:50px;
 color:#212121;
 background: #ccc;
 font-size: 60px;
 font-weight: bold;
 line-height: 80px;
 text-align: center;
 position: absolute;
 top:130px;
 opacity: 0.8;
 filter: alpha(opacity=80);
 cursor: pointer;

 }
 #shang{
 left:0;
 }
 #xia{
 right:0;
 }
 #box #list2{
 height:20px;
 width:195px;
 position: absolute;
 left:297px;
 bottom:25px;
 opacity: 0.8;
 filter: alpha(opacity=80);

 }
 #box #list2 li{
 height:20px;
 width:20px;
 background: #ccc;
 border-radius: 50%;
 float: left;
 margin-right:5px;
 cursor: pointer;

 }

 #box #list2 li.active{
 background: black;
 }
 

 
 
 
 
 

 
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