<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{
padding: 0px;
margin: 0px;
}
.box2{
position: relative;
width: 500px;
height: 400px;
border: 10px solid rgb(247, 241, 241);
box-shadow: 10px 10px 10px #aeaeae;
overflow: hidden;
}
.tup{
position: absolute;
width: 3000px;
height: 100%;
border: 1px solid blueviolet;
}
.tup li{
list-style: none;
width: 500px;
height: 400px;
/* border: 1px solid burlywood; */
float: left;
}
.tup li:nth-child(1){
background: url(images/大1.jpg);
}
.tup li:nth-child(2){
background: url(images/大2.jpg);
}
.tup li:nth-child(3){
background: url(images/大5.png);
}
.tup li:nth-child(4){
background: url(images/大6.jpg);
}
.tup li:nth-child(5){
background: url(images/大7.jpg);
}
.tup li:nth-child(6){
background: url(images/大8.jpg);
}
.right{
position: absolute;
top: 50%;
margin-top: -10px;
right: 20px;
width: 20px;
height: 20px;
background-color:rgba(0,0,0,0.4);
}
a{
color: aliceblue;
text-decoration: none;
}
.left{
position: absolute;
top: 50%;
margin-top: -10px;
left: 20px;
width: 20px;
height: 20px;
background-color:rgba(0,0,0,0.4);
}
</style>
</head>
<body>
<div class="box2">
<ul class="tup">
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
<div class="right">
<a href="#">></a>
</div>
<div class="left">
<a href="#"><</a>
</div>
</div>
</body>
<script>
const right=document.querySelector('.right');
const left=document.querySelector('.left');
const ul=document.querySelector('.tup');
const box2=document.querySelector('.box2');
let arr=document.querySelectorAll('.tup li');
console.log(arr)
let index=0;
let width=500;
function stepy(){
ul.style.left=-index*width+'px';
}
right.addEventListener('click',function(){
index++;
//如果这只写大于arr.length，最后会多一个空白li
if(index>=arr.length){
index=0;
}
stepy();
})
left.addEventListener('click',function(){
index--;
if(index<0){
index=5;
}
-stepy();
})
let xh=setInterval(function(){
right.click();
},1000)
box2.addEventListener('mouseenter',function(){
clearInterval(xh);
console.log(xh);
})
box2.addEventListener('mouseleave',function(){
clearInterval(xh);
setInterval(function(){
right.click();
},1000)
})
</script>
</html>
解决方法：鼠标离开时，设置的定时器没有命名，也没有关闭定时器
box2.addEventListener('mouseleave',function(){
clearInterval(xh);
xh= setInterval(function(){
right.click();
},1000)
})