完美实现js焦点轮播效果(一)

最简单轮播形式，js中通过pic的display属性控制变换，也可通过调整Pic的margin-Left

效果如图：

实现代码：

<!DOCTYPE html>
<html>
<head lang="en">
 <meta charset="UTF-8">
 <title></title>
 <style type="text/css">
*{
 margin: 0;
 padding: 0;
 list-style: none;
 text-decoration: none;
}
 .wrap{
 width: 490px;
 height: 170px;
 margin: 100px auto;
 border: 1px solid #000000;
 position: relative;
 overflow: hidden;
 }
 #pic{
 width: 2450px;
 height: 170px;
 }
 #pic li{
 float: left;
 }
 #list{
 position: absolute;
 bottom: 10px;
 left:150px ;
 }
 #list li{
 float: left;
 width: 15px;
 height: 15px;
 background: #fff;
 margin: 0 10px;
 border-radius: 50%;
 cursor: pointer;
 }
 #list .on{
 background: #e27a00;
 }
 .Prev{
 top: 30px;
 left: 0;
 }
 .Next{
 top: 30px;
 right: 0;
 }
 .Prev,.Next{
 position: absolute;
 font-size: 80px;
 font-weight: bold;
 color:#fff ;
 -webkit-transition: all 0.35s ease-in-out
 }
 .Next:hover,
 .Prev:hover{
 background: #ccc;
 background: rgba(204, 204, 204, 0.4);
 }
 .show{
 display: block;
 }
 .hidden{
 display: none;
 }
 </style>
 <script type="text/javascript">
 window.onload=function(){
 var pic=document.getElementById('pic').getElementsByTagName('li');
 var list=document.getElementById('list').getElementsByTagName('li');
 var prev=document.getElementById('Prev');
 var next=document.getElementById('Next');
 var index=0;
 var timer=null;

 auto();
 for(var i=0;i<list.length;i++){
 list[i].index=i;
 list[i].onmouseover=function(){
  clearInterval(timer);
  Change(this.index);
 }
 list[i].onmouseout=function(){
  auto();
 }
 pic[i].onmouseover=function(){
  clearInterval(timer);
 }
 pic[i].onmouseout=function(){
  auto();
 }
 }
 prev.onclick=function(){
 clearInterval(timer);
 index--;
 if(index<=0){
  index=list.length-1;
 }
 Change(index);
 }
 next.onclick=function(){
 clearInterval(timer);
 index++;
 if(index>=list.length){
  index=0;
 }
 Change(index);
 }
 prev.onmousemove=function(){
 clearInterval(timer);
 }
 prev.onmouseout=function(){
 auto();
 }
 next.onmouseover=function(){
 clearInterval(timer);
 }
 next.onmouseout=function(){
 auto();
 }

 function Change(curIndex){
  for(var i=0;i<list.length;i++){
  list[i].className="";
  pic[i].className="hidden";
  }
  list[curIndex].className="on";
  pic[curIndex].className="show";
 index=curIndex;
 }
 function auto(){
 timer=setInterval(function(){
  index++;
  if(index>=list.length){
  index=0
  }
  Change(index);
 },2000);
 }
 }
 </script>
</head>
<body>
<div class="wrap" id="wrap">
 <ul id="pic">
 <li class="show"><a href="#"><img src="/54111cd9000174cd04900170.jpg" alt=""/></a></li>
 <li><a href="#"><img src="/54111dac000118af04900170.jpg" alt=""/></a></li>
 <li><a href="#"><img src="/54111d9c0001998204900170.jpg" alt=""/></a></li>
 <li><a href="#"><img src="/54111d8a0001f41704900170.jpg" alt=""/></a></li>
 <li><a href="#"><img src="/54111d7d00018ba604900170.jpg" alt=""/></a></li>
 </ul>
 <ul id="list">
 <li class="on"></li>
 <li></li>
 <li></li>
 <li></li>
 <li></li>
 </ul>
 <a href="javascript:;" class="Prev" id="Prev"><</a>
 <a href="javascript:;" class="Next" id="Next">></a>
</div>
</body>
</html>

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