效果如下：
代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style type = "text/css">
ul, li { padding: 0; margin: 0; }
li { list-style: none; }
.box {
width: 800px;
height: 450px;
margin: 50px auto;
overflow: hidden;
position: relative;
}
.box span {
width: 40px;
height: 60px;
display: block;
position: absolute;
top: 225px;
margin-top: -20px;
cursor: pointer;
z-index: 1;
}
.box #left {
background: url('http://cdn.attach.qdfuns.com/notes/pics/201701/14/042311cbd7gbjd7sggkd2b.png') no-repeat;
left: 0;
}
.box #right {
background: url('http://cdn.attach.qdfuns.com/notes/pics/201701/14/042241w8z4hx4m4pjhyjzs.png') no-repeat;
right: 0;
}
#ad {
width: 4000px;
height: 450px;
position: absolute;
}
#ad li {
float: left;
}
</style>
<script type = "text/javascript">
window.onload = function(){
var ad = document.getElementById("ad");
var timer = null;//管理定时器
var leader = 0;
//1秒之后再开启定时器
timer = setTimeout(function(){
timer = setInterval(autoAd,30);
},1000);
//开启定时器
function autoAd(){
leader -=5;
leader<=-3200"px";
}
//鼠标划入 关闭定时器
ad.onmouseover = function() {
clearInterval(timer);
}
//鼠标离开 开启定时器
ad.onmouseout = function(){
timer = setInterval(autoAd,20);
}
}
</script>
</head>
<body>
<div class="box">
<ul id="ad">
<li><img src="/UploadFiles/2021-04-02/042153lscsitwp7sszb6zs.jpg">
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