鼠标点击左右键可切换图片，且鼠标移入右下角数字也可切换图片。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
/*重置样式*/
*{margin: 0;padding: 0; list-style: none;}
/*wrap的轮播图和切换按钮样式*/
.wrap{height: 445px;width: 100%; overflow: hidden;position: relative;}
.wrap ul{position: absolute;}
.wrap ul li{height: 445px;}
.wrap ul li img {height: 445px;width: 100%;}
.wrap ol{position: absolute;right: 10px;bottom: 10px;}
.wrap ol li{height: 20px;width: 20px; background-color:#fff;border: 1px solid #eee; margin-left: 10px;float:left; line-height: 20px; text-align: center;border-radius: 5px;}
.wrap ol li.active{background-color: gray; color: #fff; border-radius: 5px; }
.g_key img {
position: absolute;
top:165px;
cursor: pointer;
}
#g_img1 {
left: 97%;
}
</style>
</head>
<body>
<!-- wrap包裹录播的图片以及可点击跳转的按钮 -->
<div class="wrap" id="wrap">
<ul id="pic">
<li><img id="g_image1" src="image/1.jpg" alt=""></li>
<li><img src="image/2.jpg" alt=""></li>
<li><img src="image/3.jpg" alt=""></li>
<li><img src="image/4.jpg" alt=""></li>
</ul>
<ol id="list">
<li class="active">1</li>
<li>2</li>
<li>3</li>
<li>4</li>
</ol>
<div class="g_key">
<img src="image/a.png" id="g_img1" onclick = "changeImg('next')">
<img src="image/b.png" id="g_img2" onclick = "changeImg('pre')">
</div>
</div>
<script type="text/javascript">
window.onload=function(){
var wrap=document.getElementById('wrap'),
pic=document.getElementById('pic'),
list=document.getElementById('list').getElementsByTagName('li'),
index=0,
timer=null;
// 定义并调用自动播放函数
if(timer){
clearInterval(timer);
timer=null;
}
timer=setInterval(autoplay,2000);
// 定义图片切换函数
function autoplay(){
index++;
if(index>=list.length){
index=0;
}
changeoptions(index);
}
// 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].id=i;
list[i].onmouseover=function(){
clearInterval(timer);
changeoptions(this.id);
}
}
function changeoptions(curindex){
for(var j=0;j<list.length;j++){
list[j].className='';
pic.style.top=0;
}
list[curindex].className='active';
pic.style.top=-curindex*445+'px';
index=curindex;
}
}
var now = 1;
function changeImg(which){
var img = document.getElementById("g_image1");
if(which == 'pre'){
now--;
img.src = "image/" +now+".jpg"
if(now < 1){
now = 4;
img.src = "image/" +now+".jpg"
}
}
else{
now++;
img.src = "image/" +now+".jpg";
if(now > 4){
now = 1;
img.src = "image/" +now+".jpg";
}
}
}//点击左右变换图片
</script>
</body>
</html>
来源：https://www.cnblogs.com/iriliguo/p/6275424.html