HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>轮播图</title>
<link rel="stylesheet" href="css/common.css"/>
<link rel="stylesheet" href="css/carousel.css"/>
</head>
<body>
<div class="carousel">
<ul class="carousel-list">
<li><img src="img/1.jpg" /></li>
<li><img src="img/2.jpg" /></li>
<li><img src="img/3.jpg" /></li>
<li><img src="img/4.jpg" /></li>
</ul>
<div class="direction-btn">
<a href="javascript:;" class="prev">></a>
<a href="javascript:;" class="next"><</a>
</div>
<div class="dots">
<a href="javascript:;" class="active"></a>
<a href="javascript:;"></a>
<a href="javascript:;"></a>
<a href="javascript:;"></a>
</div>
</div>
<script src="js/common.js"></script>
<script src="js/carousel.js"></script>
</body>
</html>
common.js
/*
缓冲运动
obj：运动的对象
target：运动属性和终点值的对象
fn：回调函数
ratio：运动系数，默认值为8
*/
function bufferMove(obj,target,fn,ratio){
var ratio = ratio || 8;
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var allOK = true;
for(var attr in target){
var cur = 0;
if(attr === ‘opacity‘){
cur = parseInt(getStyle(obj,‘opacity‘) * 100);
} else{
cur = parseInt(getStyle(obj,attr));
}
var speed = (target[attr] - cur) / ratio;
speed = speed > 0? Math.ceil(speed) : Math.floor(speed);
var next = cur + speed;
if(attr === ‘opacity‘){
obj.style.opacity = next /100;
obj.style.filter = ‘alpha( opacity = ‘ + next + ‘)‘;
} else{
obj.style[attr] = next + ‘px‘;
}
if(next !== target[attr]){
allOK = false;
}
}
if(allOK){
clearInterval(obj.timer);
if(fn){
fn();
}
}
},50);
}
//
///*
// 获取当前样式值
//*/
function getStyle(obj, attr) {
if(obj.currentStyle) {
return obj.currentStyle[attr];
} else {
return getComputedStyle(obj, false)[attr];
}
}
//多属性函数封装
//封装获取样式的函数
// function getStyle(obj,attr){
// if(obj.currentStyle){
// return obj.currentStyle[attr];
// } else {
// return getComputedStyle(obj,false)[attr];
// }
// }
//封装类名的获取
function byClassName(sClassName){
if(document.getElementsByClassName){
return document.getElementsByClassName(sClassName);
} else {
var all = document.getElementsByTagName(‘*‘);
var result = [];
for(var i = 0;i <all.length;i++){
if(all[i].className === sClassName){
result.push(all[i]);
}
}
return result;
}
}
carousel.js
// 获取两个点击事件的元素
var oBtn = byClassName(‘direction-btn‘)[0],
// 获取大盒子
oCarousel = byClassName(‘carousel‘)[0],
// 获取存储图片的ul
oCarouselList = byClassName(‘carousel-list‘)[0],
// 获取ul下的li
oCarouselLi = oCarouselList.children,
// 获取上一个的点击按钮
oPrev = byClassName(‘prev‘)[0],
// 获取下一个的点击按钮
oNext = byClassName(‘next‘)[0],
// 记录图片下标
index = 0;
// 定义点的下标
dotIndex = 0;
// 定义常量图片的宽度
const iPerW = 590;
// 定义定时器
var timer = null;
var oDots = byClassName(‘dots‘)[0];
var oDotsA = Array.from(oDots.children);
//遍历a
oDotsA.forEach((v,k) =>{
v.onmouseover = function(){
index = k;
dotIndex = k;
bufferMove(oCarouselList,{left:-index * iPerW});
setDotClass();
}
})
function setDotClass(){
//遍历每个a标签
oDotsA.forEach(v => v.className=‘‘);
// 右侧a判断
if(dotIndex >= oDotsA.length){
dotIndex = 0;
}
// 左侧a判断
if(dotIndex < 0){
dotIndex = oDotsA.length - 1;
}
oDotsA[dotIndex].className = ‘active‘;
}
//添加第一张图片到末尾
oCarouselList.innerHTML += oCarouselLi[0].outerHTML;
//定义ul的总宽度
oCarouselList.style.width = iPerW * oCarouselLi.length + ‘px‘;
oCarousel.onmouseover = function(){
clearInterval(timer);
oBtn.style.display = ‘block‘;
}
oCarousel.onmouseout = function(){
autoMove();
oBtn.style.display = ‘none‘;
}
//添加点击事件
oNext.onclick = function(){
rightMove();
}
function rightMove(){
index++;
dotIndex++;
if(index >= oCarouselLi.length){
index = 1;
oCarouselList.style.left = ‘0px‘;
}
bufferMove(oCarouselList,{left:-index * iPerW});
setDotClass();
}
//添加左侧点击事件
oPrev.onclick = function(){
index--;
dotIndex--;
if(index < 0){
index = oCarouselLi.length - 2;
oCarouselList.style.left = - (oCarouselLi.length - 1) * iPerW + ‘px‘;
}
bufferMove(oCarouselList,{left:-index * iPerW});
setDotClass();
}
//自动播放
autoMove();
function autoMove(){
timer = setInterval(function(){
rightMove();
},3000);
}
css文件
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td{
margin: 0;
padding: 0;
}
body{
font-family:"Mrcrosoft Yahei",Arial;
}
ul,ol{
list-style: none;
}
a{
text-decoration: none;
}
img{
border:none;
}
body{
background:lightblue;
}
.carousel{
width: 590px;
height: 340px;
margin: 50px auto;
overflow: hidden;
position: relative;
}
.carousel-list{
position: absolute;
}
.carousel-list li{
float: left;
}
.direction-btn{
display: none;
}
.direction-btn a{
position: absolute;
top: 50%;
margin-top: -30px;
width: 30px;
line-height: 60px;
background: rgba(0, 0, 0, .3);
color: #fff;
font-size: 30px;
text-align: center;
}
.prev {
left: 0;
}
.next {
right: 0;
}
.dots{
position: absolute;
background:rgba(255,255,255,.4);
border-radius: 12px;
width: 72px;
left: 0;
right: 0;
bottom: 10px;
margin: 0 auto;
font-size: 0;
line-height: 0;
padding: 0 4px;
}
.dots a{
display: inline-block;
width:10px;
height: 10px;
border-radius: 50%;
background: #fff;
margin: 6px 4px;
}
.dots .active{
background: red;
}
图片更换成自己的路径即可
原文地址：https://www.cnblogs.com/bgwhite/p/9476330.html
时间： 2024-08-29 07:05:08