下面将介绍2种（不是方法！！！）
<!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>轮播图点击切换</title>
<style>
* {
box-sizing: border-box;
}
.slider {
width: 560px;
height: 400px;
overflow: hidden;
}
.slider-wrapper {
width: 100%;
height: 320px;
}
.slider-wrapper img {
width: 100%;
height: 100%;
display: block;
}
.slider-footer {
height: 80px;
background-color: rgb(100, 67, 68);
padding: 12px 12px 0 12px;
position: relative;
}
.slider-footer .toggle {
position: absolute;
right: 0;
top: 12px;
display: flex;
}
.slider-footer .toggle button {
margin-right: 12px;
width: 28px;
height: 28px;
appearance: none;
border: none;
background: rgba(255, 255, 255, 0.1);
color: #fff;
border-radius: 4px;
cursor: pointer;
}
.slider-footer .toggle button:hover {
background: rgba(255, 255, 255, 0.2);
}
.slider-footer p {
margin: 0;
color: #fff;
font-size: 18px;
margin-bottom: 10px;
}
.slider-indicator {
margin: 0;
padding: 0;
list-style: none;
display: flex;
align-items: center;
}
.slider-indicator li {
width: 8px;
height: 8px;
margin: 4px;
border-radius: 50%;
background: #fff;
opacity: 0.4;
cursor: pointer;
}
.slider-indicator li.active {
width: 12px;
height: 12px;
opacity: 1;
}
</style>
</head>
<body>
<div class="slider">
<div class="slider-wrapper">
<img src="./images/slider01.jpg" alt="" />
</div>
<div class="slider-footer">
<p>对人类来说会不会太超前了？</p>
<ul class="slider-indicator">
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
<div class="toggle">
<button class="prev"><</button>
<button class="next">></button>
</div>
</div>
</div>// 第一种轮播图随机数
<script>
// 1. 初始数据
const sliderData = [
{ url: './images/slider01.jpg', title: '对人类来说会不会太超前了？', color: 'rgb(100, 67, 68)' },
{ url: './images/slider02.jpg', title: '开启剑与雪的黑暗传说！', color: 'rgb(43, 35, 26)' },
{ url: './images/slider03.jpg', title: '真正的jo厨出现了！', color: 'rgb(36, 31, 33)' },
{ url: './images/slider04.jpg', title: '李玉刚：让世界通过B站看到东方大国文化', color: 'rgb(139, 98, 66)' },
{ url: './images/slider05.jpg', title: '快来分享你的寒假日常吧~', color: 'rgb(67, 90, 92)' },
{ url: './images/slider06.jpg', title: '哔哩哔哩小年YEAH', color: 'rgb(166, 131, 143)' },
{ url: './images/slider07.jpg', title: '一站式解决你的电脑配置问题！！！', color: 'rgb(53, 29, 25)' },
{ url: './images/slider08.jpg', title: '谁不想和小猫咪贴贴呢！', color: 'rgb(99, 72, 114)' },
]
//第一种：生成随机数
// 2.获取DOM对象
const img = document.querySelector('.slider-wrapper>img')
const pp = document.querySelector('.slider-footer>p')
const bg = document.querySelector('.slider-footer')
// 2.1 随机数 生成一个随机数 0-7
let num = Math.floor(Math.random()*7)
// 修改元素
img.src = sliderData[num].url
pp.innerHTML = sliderData[num].title
bg.style.backgroundColor = sliderData[num].color
// 切换，从1切到2,先删除所有active，在逐一添加
const lis = document.querySelectorAll('.slider-footer>ul>li')
console.log(lis)
for (let i = 0; i< lis.length; i++) {
lis[i].classList.remove('actove')
}
console.log(lis)
// 为当前需要高亮的小圆点添加active类名
lis[num].classList.add('active')
let s = 0
let time = setInterval(function(){
s++
lis.innerHTML = sliderData
}, 1000);
</script>
</body>
</html>// 第二种轮播图计时
// 2.获取DOM对象
const img = document.querySelector('.slider-wrapper>img')
const pp = document.querySelector('.slider-footer>p')
const bg = document.querySelector('.slider-footer')
const lis = document.querySelectorAll('.slider-footer>ul>li')
let s = 0
let time = setInterval(function(){
//要让它等于最后一张图的下标，才在到最后一张图的时候停止
if(s === sliderData.length-1){
clearInterval(time)
return
}
s++
img.src = sliderData[s].url
pp.innerHTML = sliderData[s].title
bg.style.backgroundColor = sliderData[s].color
for (let i = 0; i < sliderData.length; i++) {
lis[i].classList.remove('active')
}
lis[s].classList.add('active')
// if(s===7) s=-1 当秒数到 7 时，切换为0
},1000);