原生手动实现轮播图
本文最后更新于：2023年3月19日 晚上
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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<div>
<div class="swiper-container">
<div class="swiper-list" id="swiperList">
<div class="swiper-item">
<img
src="https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=518601442,146924060&fm=26&gp=0.jpg"
alt="1"
/>
</div>
<div class="swiper-item">
<img
src="https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=518601442,146924060&fm=26&gp=0.jpg"
alt="2"
/>
</div>
<div class="swiper-item">
<img
src="https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=518601442,146924060&fm=26&gp=0.jpg"
alt="3"
/>
</div>
</div>
</div>
<div class="swiper-dot" id="dotList"></div>
<div>
<button onclick="handlePrev()">上一张</button>
<button onclick="handleNext()">下一张</button>
</div>
</div>
<script>
let imageCount = 0;
let index = 0;
let interval = 2000;
setInterval(() => {
handleNext();
}, interval);
const handlePrev = () => {
index = index === 0 ? imageCount - 1 : index - 1;
change();
};
const handleNext = () => {
index = index === imageCount - 1 ? 0 : index + 1;
change();
};
const change = () => {
const dotItem = document.querySelector("#dotList").children;
const activeSwiperItem = document.querySelector("#swiperList");
console.log(dotItem);
for (let i = 0; i < dotItem.length; i++) {
if (i === index) dotItem[i].className = "swiper-dot-item active";
else dotItem[i].className = "swiper-dot-item";
}
const left = 600 * index;
activeSwiperItem.setAttribute("style", `left:-${left}px;`);
};
const countImageNum = () => {
const imageDoms = document.querySelector("#swiperList");
imageCount = imageDoms.children.length;
console.log(imageCount);
};
const creatDotDoms = () => {
const dotDom = document.querySelector("#dotList");
console.log(dotDom);
for (let i = 0; i < imageCount; i++) {
let div = document.createElement("div");
div.className = "swiper-dot-item";
dotDom.appendChild(div);
}
};
window.onload = function () {
countImageNum();
creatDotDoms();
change();
};
</script>
<style>
.swiper-container {
width: 600px;
height: 300px;
overflow: hidden;
position: relative;
}
.swiper-list {
display: flex;
flex-wrap: nowrap;
position: absolute;
transition: left 1s;
left: 0;
}
.swiper-item {
list-style-type: none;
}
.swiper-item img {
width: 600px;
height: 300px;
}
.swiper-dot {
width: 600px;
display: flex;
justify-content: space-around;
}
.swiper-dot-item {
width: 20px;
height: 10px;
border-radius: 5px;
background-color: #000;
}
.active {
background-color: #f00;
}
</style>
</body>
</html>
|