还不会手撕轮播图？看完这篇你必会，超详细！图片来源于小米商城网站，若侵权请联系作者，立即删除。

啥也不说，先看效果图

一、html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>轮播图</title>
  <link rel="stylesheet" href="css/style.css">
</head>
<body>
  <div class="banner">
    <div class="content">
      <ul id="item">
        <li class="item active" ><a href="#"><img src="./img/1.jpg"></a></li>
        <li class="item" ><a href="#"><img src="./img/2.jpg"></a></li>
        <li class="item" ><a href="#"><img src="./img/3.jpg"></a></li>
        <li class="item" ><a href="#"><img src="./img/4.jpg"></a></li>
        <li class="item" ><a href="#"><img src="./img/5.jpg"></a></li>
      </ul>
      <div id="btn-left"></div>
      <div id="btn-right"></div>
      <ul id="point">
        <li class="point active" data-index="0"></li>
        <li class="point" data-index="1"></li>
        <li class="point" data-index="2"></li>
        <li class="point" data-index="3"></li>
        <li class="point" data-index="4"></li>
      </ul>
    </div>
  </div>
</body>
<script src="js/index.js"></script>
</html>

二、css

*{
  margin: 0;
  padding: 0;
}
a{
  text-decoration: none;
}
li{
  list-style: none;
}
.banner {
  width: 100%;

}
.content {
  width: 600px;
  height: 225px;
  margin: 20px auto;
  position: relative;
}
#item {
  width: 100%;
  height: 100%;
}
.item {
  position: absolute;
  opacity: 0;
  transform: all 1s;
}
.item.active {
  opacity: 1;
}
#btn-left {
  width: 41px;
  height: 69px;
  background: url(../img/icon-slides.png) no-repeat -84px 50%;
  z-index: 99;
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  cursor: pointer;
}
#btn-left:hover{
  background-position: 0 50%;
}
#btn-right {
  width: 41px;
  height: 69px;
  background: url(../img/icon-slides.png) no-repeat -125px 50%;
  z-index: 99;
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  cursor: pointer;
}
#btn-right:hover{
  background-position: -42px 50%;
}
#point {
  height: 20px;
  display: flex;
  position: absolute;
  bottom: 10px;
  right: 25px;
}
.point {
  width: 6px;
  height: 6px;
  border-radius: 10px;
  border: 2px solid #fff;
  background: rgba(0,0,0,.4);
  border-color: hsla(0, 1%, 64%, .3);
  overflow: hidden;
  cursor: pointer;
  margin: 5px;
}
.point:hover {
  background-color: hsla(0,0%,100%,.4);
  border-color: rgba(0,0,0,.4);
}
.point.active {
  background-color: hsla(0,0%,100%,.4);
  border-color: rgba(0,0,0,.4);
}
img {
  width: 100%;
}

三、js

let items = document.getElementsByClassName("item");
let points = document.getElementsByClassName("point");
let leftBtn = document.getElementById("btn-left");
let rightBtn = document.getElementById("btn-right");
let content = document.querySelector(".content");
let index = 0;
let timer = null;

// 清楚class
let clearActive = function() {
  for(let i = 0; i < items.length; i++) {
    items[i].className = "item";
    points[i].className = "point";
  }
}

let goIndex = function() {
  clearActive();
  items[index].className = "item active";
  points[index].className = "point active";
}

rightBtn.onclick = function() {
  if (index < items.length-1) {
    index++;
  } else {
    index = 0;
  }
  goIndex();
}

leftBtn.onclick = function() {
  if (index > 0) {
    index--;
  } else {
    index = items.length-1;
  }
  goIndex();
}

// 开启
timer = setInterval(()=>{
  rightBtn.onclick();
},1500)

// 当鼠标移入时候，关闭定时器
content.onmouseover = function() {
  clearInterval(timer);
}

// 当鼠标移出时 重新开启计时器
content.onmouseout = function() {
  timer = setInterval(()=>{
    rightBtn.onclick();
  },1500);
}

// 当点击原圆点时 跳转到 对应图片
for(let i = 0; i < points.length; i++) {
  points[i].addEventListener("click", function() {
    // 给所有的圆点添加监听事件
    let pointIndex = this.getAttribute("data-index");
    index = pointIndex;
    goIndex();
  })
}

看完觉得有用的话，记得点赞哟，thanks! 免责声明：图片来源于小米商城网站，若侵权请联系作者，立即删除。