效果
<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/wallpaper1.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 class="active"></li>
<li></li>
<li></li>
<li></li>
</ul>
<div class="toggle">
<button class="prev"><</button>
<button class="next">></button>
</div>
</div>
</div>
// 1. 初始数据
const sliderData = [
{ url: './images/wallpaper1.jpg', title: '对人类来说会不会太超前了？' },
{ url: './images/wallpaper2.jpg', title: '开启剑与雪的黑暗传说！' },
{ url: './images/wallpaper3.jpg', title: '真正的出现了！' },
{ url: './images/wallpaper4.jpg', title: '人生如梦，一樽还酹江月' },
]
//获取元素
const img = document.querySelector('.slider-wrapper img')
const title = document.querySelector('.slider-footer p')
//开启定时器
let i =0
setInterval(function(){
i++
if(i >= sliderData.length){
i=0
}
//更改图片路径
img.src = sliderData[i].url
//更改文字路径
title.innerHTML = sliderData[i].title
document.querySelector('.slider-indicator .active').classList.remove('active')
document.querySelector(`.slider-indicator li:nth-child(${i+1})`).classList.add('active')
},2000)
js解析
1.首先获取图片和文字的dom对象。再设定一个用来计数的i，写间歇函数，让i在函数内自加，这样的话就可以遍历对象，取到对应的图片和文字。在i++后设定当i等于存对象的数组长度时把i设为0.就实现了从最后一张图到第一张图的跳转。
2.在间歇函数内获取li的dom对象，使用子代选择器实现选取到不同的li，并用classList.remove删除在添加active之前旧的active。classList.add()添加active