效果图:

<div class="wrap" id='wrap'>
 <ul id="pic">
 <li><img src="img/ce.jpg" alt=""></li>
 <li><img src="img/ce2.jpg" alt=""></li>
 <li><img src="img/ce3.jpg" alt=""></li>
 </ul>
 <ol id="list">
 <li class="on">1</li>
 <li>2</li>
 <li>3</li>
 </ol>
 </div>
*{margin:0;
 padding:0;
 list-style:none;}
 .wrap{height:170px;/**/
 width:490px;/**/
 margin:60px auto;/**/
 overflow: hidden;
 position: relative;
 margin:100px auto;}/**/
 .wrap ul{position:absolute;} 
 .wrap ul li{height:170px;}/**/
 .wrap ol{position:absolute;
 right:5px;
 bottom:10px;}
 .wrap ol li{height:20px; width: 20px;
 background:#ccc;
 border:solid 1px #666;
 margin-left:5px;
 color:#000;
 float:left;
 line-height:center;
 text-align:center;
 cursor:pointer;}
 .wrap ol .on{background:#E97305;
 color:#fff;}
window.onload=function(){
 var wrap=document.getElementById('wrap'),
 pic=document.getElementById('pic').getElementsByTagName("li"),
 list=document.getElementById('list').getElementsByTagName('li'),
 index=0,
 timer=null;
 
 // 定义并调用自动播放函数
 timer = setInterval(autoPlay, 2000);
 
 // 鼠标划过整个容器时停止自动播放
 wrap.onmouseover = function () {
 clearInterval(timer);
 }
 
 // 鼠标离开整个容器时继续播放至下一张
 wrap.onmouseout = function () {
 timer = setInterval(autoPlay, 2000);
 }
 // 遍历所有数字导航实现划过切换至对应的图片
 for (var i = 0; i < list.length; i++) {
 list[i].onmouseover = function () {
 clearInterval(timer);
 index = this.innerText - 1;
 changePic(index);
 };
 };
 
 function autoPlay () {
 if (++index >= pic.length) index = 0;
 changePic(index);
 }
 
 // 定义图片切换函数
 function changePic (curIndex) {
 for (var i = 0; i < pic.length; ++i) {
 pic[i].style.display = "none";
 list[i].className = "";
 }
 pic[curIndex].style.display = "block";
 list[curIndex].className = "on";
 }
 
 };
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