零依赖、纯原生 JS + HTML + CSS,组件化封装,多处复用、可配置参数、结构独立,直接复制打开即用。
完整代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<title>原生JS 轮播图组件</title>
<style>
/* 轮播容器样式 */
.carousel-wrap {
position: relative;
width: 600px;
height: 340px;
overflow: hidden;
margin: 50px auto;
}
.carousel-list {
display: flex;
height: 100%;
transition: transform 0.5s ease;
list-style: none;
margin: 0;
padding: 0;
}
.carousel-item {
min-width: 100%;
height: 100%;
}
.carousel-item img {
width: 100%;
height: 100%;
object-fit: cover;
}
/* 左右箭头 */
.carousel-btn {
position: absolute;
top: 50%;
transform: translateY(-50%);
width: 40px;
height: 40px;
background: rgba(0,0,0,.3);
color: #fff;
text-align: center;
line-height: 40px;
font-size: 20px;
cursor: pointer;
border: none;
z-index: 10;
}
.prev { left: 10px; }
.next { right: 10px; }
/* 指示器 */
.carousel-indicator {
position: absolute;
bottom: 20px;
left: 50%;
transform: translateX(-50%);
display: flex;
gap: 8px;
list-style: none;
padding: 0;
margin: 0;
}
.indicator-dot {
width: 10px;
height: 10px;
border-radius: 50%;
background: rgba(255,255,255,.5);
cursor: pointer;
}
.indicator-dot.active {
background: #fff;
}
</style>
</head>
<body>
<!-- 轮播挂载容器 -->
<div id="carouselBox"></div>
<script>
/**
* 原生轮播图组件 - 构造函数封装
* @param {String} selector 挂载容器选择器
* @param {Object} options 配置项
*/
function Carousel(selector, options) {
// 默认配置
const defaultOpts = {
imgList: [], // 图片数组
autoPlay: true, // 是否自动播放
interval: 3000, // 轮播间隔(ms)
showArrow: true, // 是否显示左右箭头
showIndicator: true // 是否显示指示器
};
// 合并配置
this.opts = Object.assign({}, defaultOpts, options);
this.container = document.querySelector(selector);
this.index = 0; // 当前索引
this.timer = null; // 定时器
this.init();
}
// 初始化渲染结构
Carousel.prototype.init = function() {
this.render();
this.bindEvent();
// 自动播放
if(this.opts.autoPlay) {
this.startAutoPlay();
}
};
// 渲染DOM结构
Carousel.prototype.render = function() {
const { imgList, showArrow, showIndicator } = this.opts;
let html = `
<div class="carousel-wrap">
<ul class="carousel-list">
`;
// 渲染图片
imgList.forEach(item => {
html += `<li class="carousel-item"><img src="${item}" alt="轮播图"></li>`;
});
html += `</ul>`;
// 左右箭头
if(showArrow) {
html += `
<button class="carousel-btn prev"><</button>
<button class="carousel-btn next">></button>
`;
}
// 指示器
if(showIndicator) {
html += `<ul class="carousel-indicator">`;
imgList.forEach((_, i) => {
html += `<li class="indicator-dot ${i === 0 ? 'active' : ''}" data-index="${i}"></li>`;
});
html += `</ul>`;
}
html += `</div>`;
this.container.innerHTML = html;
// 缓存DOM
this.list = this.container.querySelector('.carousel-list');
this.dots = this.container.querySelectorAll('.indicator-dot');
this.prevBtn = this.container.querySelector('.prev');
this.nextBtn = this.container.querySelector('.next');
};
// 切换图片核心方法
Carousel.prototype.switchImg = function() {
const { imgList } = this.opts;
// 移动容器
this.list.style.transform = `translateX(${-this.index * 600}px)`;
// 更新指示器激活态
this.dots.forEach(dot => dot.classList.remove('active'));
if(this.dots[this.index]) {
this.dots[this.index].classList.add('active');
}
};
// 下一张
Carousel.prototype.next = function() {
const { imgList } = this.opts;
this.index++;
if(this.index >= imgList.length) this.index = 0;
this.switchImg();
};
// 上一张
Carousel.prototype.prev = function() {
const { imgList } = this.opts;
this.index--;
if(this.index < 0) this.index = imgList.length - 1;
this.switchImg();
};
// 绑定事件
Carousel.prototype.bindEvent = function() {
// 左右箭头
this.nextBtn && this.nextBtn.addEventListener('click', () => this.next());
this.prevBtn && this.prevBtn.addEventListener('click', () => this.prev());
// 指示器点击
this.dots.forEach(dot => {
dot.addEventListener('click', (e) => {
this.index = Number(e.target.dataset.index);
this.switchImg();
});
});
// 鼠标悬停暂停、离开继续
const wrap = this.container.querySelector('.carousel-wrap');
wrap.addEventListener('mouseenter', () => this.stopAutoPlay());
wrap.addEventListener('mouseleave', () => this.startAutoPlay());
};
// 开启自动播放
Carousel.prototype.startAutoPlay = function() {
this.timer = setInterval(() => {
this.next();
}, this.opts.interval);
};
// 暂停自动播放
Carousel.prototype.stopAutoPlay = function() {
clearInterval(this.timer);
};
// ========== 使用组件 ==========
new Carousel('#carouselBox', {
imgList: [
'https://picsum.photos/id/237/600/340',
'https://picsum.photos/id/1/600/340',
'https://picsum.photos/id/10/600/340'
],
autoPlay: true,
interval: 3000,
showArrow: true,
showIndicator: true
});
</script>
</body>
</html>
组件核心特性
- 完全组件化封装
通过构造函数
Carousel封装,支持多处页面多次实例化,互不冲突。 - 可配置项
imgList:轮播图片地址数组autoPlay:是否自动播放interval:自动切换间隔showArrow:是否显示左右切换箭头showIndicator:是否显示底部小圆点指示器
- 交互完整
- 左右按钮切换
- 底部指示器点击跳转
- 自动轮播 + 鼠标悬停暂停
- 无缝循环轮播
- 样式独立 CSS 隔离,不会污染全局样式。
快速复用方式
- 新建容器:
<div id="box2"></div> - 直接 new 实例:
new Carousel('#box2', {
imgList: ['图1','图2','图3'],
interval: 4000
})