<!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>Swiper 轮播图 dotcoo</title>
<style>
.list {
margin: 100px auto;
border: 16px solid #ccc;
height: 40px;
width: 300px;
}
.list .item {
line-height: 40px;
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<div class="list">
<div class="item" style="background-color:#000000aa">00</div>
<div class="item" style="background-color:#249249aa">01</div>
<div class="item" style="background-color:#492492aa">02</div>
<div class="item" style="background-color:#6db6dbaa">03</div>
<div class="item" style="background-color:#924924aa">04</div>
<div class="item" style="background-color:#b6db6daa">05</div>
<div class="item" style="background-color:#db6db6aa">06</div>
</div>
<script>
/**
* 轮播图
* @param {string} selector 轮播图容器选择器
* @param {number} duration 轮播间隔时长
* @param {number} current 默认显示第几个元素
* @param {string} direction 滚动方向 top bottom left right
* @param {boolean} debug 是否调试
* @returns {number} 定时器id
*/
function swiper(selector, duration = 3000, current = 0, direction = 'top', debug = false) {
const vertical = direction == 'top' || direction == 'bottom'; // vertical horizontal 是垂直还是水平
const forward = direction == 'top' || direction == 'left'; // forward backward 是前进还是倒退
const parent = document.querySelector(selector), width = parent.clientWidth, height = parent.clientHeight;
parent.style.position = parent.style.position || 'relative';
parent.style.overflow = debug ? '' : (parent.style.overflow || 'hidden');
const items = document.querySelectorAll(selector + ' > *'), l = items.length;
const move = () => {
for (let i = 0, index = (l + current + i - 1) % l, item = items[index]; i < l; i++, index = (l + current + i - 1) % l, item = items[index]) {
item.style.position = 'absolute';
if (i < 3) {
if (i == 0) {
item.style.transition = forward ? 'all .4s ease-out' : '';
} else if (i == 1) {
item.style.transition = 'all .4s ease-out';
} else if (i == 2) {
item.style.transition = forward ? '' : 'all .4s ease-out';
}
item.style.top = vertical ? `${(i - 1) * height}px` : 0;
item.style.left = vertical ? 0 : `${(i - 1) * width}px`;
} else {
item.style.transition = '';
item.style.left = 0;
item.style.top = `${(index + 3) * height}px`;
}
}
current = (l + current + (forward ? 1 : -1)) % l;
};
move();
return setInterval(move, duration);
}
swiper('.list');
</script>
</body>
</html>