<!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</title>
</head>
<style>
.container {
position: relative;
width: 600px;
height: 400px;
margin: 0 auto;
background-color: gray;
overflow: hidden;
}
.ul-img {
position: absolute;
display: flex;
width: 4200px;
height: 400px;
left: 0;
padding: 0;
margin: 0;
}
.li-img {
list-style: none;
width: 600px;
height: 400px;
display: flex;
align-items: center;
justify-content: center;
background-color: aquamarine;
font-size: 30px;
font-weight: 800;
border: 1px solid #ccc;
}
/* 上一张、下一张 */
.prev,
.next {
position: absolute;
height: 400px;
width: 80px;
display: flex;
justify-content: center;
align-items: center;
top: 0;
}
.prev {
left: 0;
}
.next {
right: 0;
}
.prev span,
.next span {
display: block;
color: #fff;
width: 40px;
height: 40px;
display: flex;
justify-content: center;
align-items: center;
background-color: rgba(0, 0, 0, 0.5);
border-radius: 50%;
cursor: pointer;
}
/* 数字切换按钮 */
.num-box {
position: absolute;
left: 50%;
bottom: 20px;
transform: translate(-50%, 0);
z-index: 2;
}
.num-ul {
list-style: none;
margin: 0;
padding: 0;
display: flex;
}
.num-ul li {
height: 20px;
width: 20px;
border-radius: 50%;
background-color: rgba(0, 0, 0, 0.5);
display: flex;
justify-content: center;
align-items: center;
font-size: 9px;
color: #fff;
margin: 0 4px;
cursor: pointer;
user-select: none;
}
</style>
<body>
<div class="container">
<!-- 图片列表 -->
<ul class="ul-img">
<li class="li-img">1</li>
<li class="li-img">2</li>
<li class="li-img">3</li>
<li class="li-img">4</li>
<li class="li-img">5</li>
</ul>
<!-- 上一张、下一张按钮 -->
<div class="prev">
<span><</span>
</div>
<div class="next">
<span>></span>
</div>
<!-- 数字切换按钮 -->
<div class="num-box">
<ul class="num-ul">
<li data-index="0">1</li>
<li data-index="1">2</li>
<li data-index="2">3</li>
<li data-index="3">4</li>
<li data-index="4">5</li>
</ul>
</div>
</div>
</body>
<script>
// 获取元素节点
const containerDom = document.getElementsByClassName("container")[0]; // 容器
const ulDom = document.getElementsByClassName("ul-img")[0]; // 图片盒子
const prevDom = document.getElementsByClassName("prev")[0].firstElementChild; // 上一张按钮
const nextDom = document.getElementsByClassName("next")[0].firstElementChild; // 下一张按钮
const numUlDom = document.getElementsByClassName("num-ul")[0]; // 数字按钮父级容器
const numList = document
.getElementsByClassName("num-ul")[0]
.getElementsByTagName("li"); // 数字切换按钮列表
// 定义全局变量
let currentIndex = 0; // 当前显示的图片索引
let timer = null; // 自动播放定时器
numList[currentIndex].style.backgroundColor = "#ccc"; // 默认选中第一个数字
// 上一张
prevDom.addEventListener("click", prevFun);
// 下一张
nextDom.addEventListener("click", nextFun);
// 鼠标移入容器，停止自动播放
containerDom.addEventListener("mouseenter", stopAutoPlay);
// 鼠标移出容器，开启自动播放
containerDom.addEventListener("mouseleave", autoPlay);
// 数字按钮点击事件
numUlDom.addEventListener("click", numClick);
// 开启自动播放
autoPlay();
// 切换上一张
function prevFun() {
ulDom.style.transition = "0.5s";
numList[currentIndex].style.backgroundColor = ""; // 清空上一个按钮的样式
if (currentIndex === 0) {
ulDom.style.transition = "0s"; // 为了实现无缝滚动，清除动画
currentIndex = 4;
} else {
--currentIndex;
}
ulDom.style.left = `-${currentIndex * 600}px`;
numList[currentIndex].style.backgroundColor = "#ccc";
}
// 切换下一张
function nextFun() {
ulDom.style.transition = "0.5s";
numList[currentIndex].style.backgroundColor = ""; // 清空上一个按钮的样式
if (currentIndex === 4) {
ulDom.style.transition = "0s"; // 为了实现无缝滚动，清除动画
currentIndex = 0; // 重新播放第一张
} else {
++currentIndex;
}
ulDom.style.left = `-${currentIndex * 600}px`;
numList[currentIndex].style.backgroundColor = "#ccc"; // 设置按钮选中样式
}
// 数字按钮点击事件
function numClick(e) {
ulDom.style.transition = "0.5s";
let index = e.target.dataset.index;
if (index == undefined) {
return;
}
numList[currentIndex].style.backgroundColor = ""; // 清空上一个按钮的样式
currentIndex = Number(index);
numList[currentIndex].style.backgroundColor = "#ccc";
ulDom.style.left = `-${currentIndex * 600}px`;
}
// 循环播放
function autoPlay() {
timer = setInterval(nextFun, 1000);
}
// 关闭自动播放
function stopAutoPlay() {
// 清除定时器
clearInterval(timer);
}
</script>
</html>
查看19道真题和解析
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