效果如下：
下面是具体的实现代码：
- HTML代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>轮播</title>
<link rel="stylesheet" href="index.css">
<script src="index.js"></script>
</head>
<body>
<div class="lunbo">
<div class="scroll">
<!-- 图片展示 -->
<img src="image/1.png" class="img current">
<img src="image/2.png" class="img">
<img src="image/3.png" class="img">
<img src="image/4.png" class="img">
<img src="image/5.png" class="img">
<!-- 左右箭头的展示 -->
<div class="left"></div>
<div class="right"></div>
<!-- 小圆点展示 -->
<div class="dots">
<span class="square"></span>
<span></span>
<span></span>
<span></span>
<span></span>
</div>
</div>
</div>
</body>
</html>
- CSS代码
.lunbo {
width: 100%;
margin:0;
text-align: center;
}
.lunbo .scroll {
position: relative;
display: inline-block;
width: 100%;
}
.lunbo .scroll .img {
display: none;
width: 100%;
height: 100%;
}
.lunbo .scroll .current {
display: block;
}
.scroll .left {
position: absolute;
top: 50%;
left: 100px;
background-image: url('image/left.png');
background-position: -83px 0;
width: 41px;
height: 69px;
cursor: pointer;
transform: translateY(-50%);
}
.scroll .right{
position: absolute;
top: 50%;
right: 100px;
background-image: url('image/right.png');
background-position: -123px 0;
width: 41px;
height: 69px;
cursor: pointer;
transform: translateY(-50%);
}
.dots {
position: absolute;
bottom: 10px;
left: calc(50% - 80px);
width: 160px;
}
.dots>span {
display: inline-block;
box-sizing: border-box;
width: 20px;
height: 20px;
border: 2px solid rgba(170,170,170,0.3);
border-radius: 15px;
cursor: pointer;
}
/* 小圆点的颜色 */
.dots .square {
background-color: #f30404;
}
- JS代码
window.addEventListener('load', function() {
//获取左右箭头
var leftArrow = this.document.querySelector('.left');
var rightArrow = this.document.querySelector('.right');
// 获取图片 和 小点
var imgs = this.document.querySelectorAll('.img');
var dots = this.document.querySelector('.dots').querySelectorAll('span');
// 给图片添加index 属性，方便判断当前的图片是哪一张
for (let i = 0; i < imgs.length; i++) {
imgs[i].setAttribute('data-index', i);
}
// 获取当前图片 和 图片的数组下标
var current = this.document.querySelector('.current');
var currentIndex = current.getAttribute('data-index');
// 左箭头的点击事件，点击了就返回前一张图片
// 如果当前图片为第一张那么需要更换到最后一张图片也就是第四张
leftArrow.addEventListener('click', function() {
if (currentIndex > 0) {
imgs[currentIndex].classList.remove('current');
dots[currentIndex].classList.remove('square');
imgs[--currentIndex].classList.add('current');
dots[currentIndex].classList.add('square');
} else {
imgs[currentIndex].classList.remove('current');
dots[currentIndex].classList.remove('square');
currentIndex = 4;
imgs[currentIndex].classList.add('current');
dots[currentIndex].classList.add('square');
}
});
// 点击右箭头下一张图片切换
// 如果当前为第五张图片，那么切换回第一张图片
rightArrow.addEventListener('click', changeImage);
//2秒切换一张照片
var timer = this.setInterval(changeImage, 2000);
function changeImage(){
if (currentIndex < 4) {
imgs[currentIndex].classList.remove('current');
dots[currentIndex].classList.remove('square');
imgs[++currentIndex].classList.add('current');
dots[currentIndex].classList.add('square');
} else {
imgs[currentIndex].classList.remove('current');
dots[currentIndex].classList.remove('square');
currentIndex = 0;
imgs[currentIndex].classList.add('current');
dots[currentIndex].classList.add('square');
}
}
// 小圆点的点击事件
for (let k = 0; k < dots.length; k++) {
dots[k].setAttribute('data-index', k);
dots[k].addEventListener('click', function() {
var index = this.getAttribute('data-index');
if (index != currentIndex) {
imgs[currentIndex].classList.remove('current');
dots[currentIndex].classList.remove('square');
imgs[index].classList.add('current');
dots[index].classList.add('square');
currentIndex = index;
}
})
}
});