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index.html
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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>原生JS实现图片轮播</title>
<style>
* {
margin: 0;
padding: 0;
text-decoration: none;
}
body {
padding: 20px;
}
#container {
width: 600px;
height: 400px;
border: 3px solid #333;
overflow: hidden;
position: relative;
margin: 0 auto;
}
#list {
width: 4200px;
height: 400px;
position: absolute;
z-index: 1;
}
#list img {
float: left;
}
#buttom {
position: absolute;
height: 10px;
width: 100px;
z-index: 2;
bottom: 20px;
left: 250px;
}
#buttom span {
cursor: pointer;
float: left;
border: 1px solid #fff;
width: 10px;
height: 10px;
border-radius: 50%;
background: #333;
margin-right: 5px;
}
#buttom .on {
background: orangered;
}
.arrow {
display: none;
position: absolute;
top: 180px;
cursor: pointer;
line-height: 40px;
text-align: center;
font-size: 40px;
font-weight: bold;
width: 40px;
height: 40px;
z-index: 2;
background-color: rgba(0, 0, 0, 0.3);
color: #fff;
}
.arrow:hover {
background-color: rgba(0, 0, 0, 0.7);
}
#container:hover .arrow {
display: block;
}
#prev {
left: 20px;
}
#next {
right: 20px;
}
#banner {
position: relative;
padding: 20px 0;
text-align: center;
font-family: '微软雅黑';
font-weight: bold;
font-size: 30px;
}
</style>
</head>
<body>
<p id="banner">JS原生图片轮播演示</p>
<div id="container">
<div id="buttom">
<span index="1" class='on'></span>
<span index="2"></span>
<span index="3"></span>
<span index="4"></span>
<span index="5"></span>
</div>
<div id="list" style='left: -600px;'>
<img src="imgs/5.jpg" alt="1" title="轮播图片">
<img src="imgs/1.jpg" alt="1" title="轮播图片">
<img src="imgs/2.jpg" alt="2" title="轮播图片">
<img src="imgs/3.jpg" alt="3" title="轮播图片">
<img src="imgs/4.jpg" alt="4" title="轮播图片">
<img src="imgs/5.jpg" alt="5" title="轮播图片">
<img src="imgs/1.jpg" alt="5" title="轮播图片">
</div>
<a href="javascript:;" id="prev" class="arrow"><</a>
<a href="javascript:;" id="next" class="arrow">></a>
</div>
<script>
window.onload = function(){ // 页面加载完后开始执行
var container = document.getElementById('container'),
list = document.getElementById('list'),
buttom = document.getElementById('buttom').getElementsByTagName('span'),
prev = document.getElementById('prev'),
next = document.getElementById('next');
index = 1,
len = 5,
animated = false,
interval = 2000;
var timer;
function animate(offset){
if (offset == 0) {
return;
}
// 加入图片动画进去效果，优化体验
animated = true;
var time = 300, //动画位移总时间
interval = 10, // 位移间隔时间
speed = offset/(time/interval), // 每次位移量
left = parseInt(list.style.left) + offset; // parseInt()解析字符串，返回整数
var go = function (){
if ((speed > 0 && parseInt(list.style.left) < left) || (speed < 0 &&parseInt(list.style.left) > left)) {
list.style.left = parseInt(list.style.left) + speed + 'px';
setTimeout(go, interval);//达到位移间隔时间后，自调go()函数，也就是运用递归不停的进行自调
} else {
list.style.left = left + 'px';
if (left > -200) {
list.style.left = -600 * len + 'px';
}
if (left < (-600 * len)) {
list.style.left = '-600px';
}
animated = false;
}
}
go();
}
function showButtom(){ //
for (var i = 0; i < buttom.length; i++) {
if (buttom[i].className == 'on') {
buttom[i].className = '';
break;
}
}
buttom[index - 1].className = 'on';
}
function play(){ // 自动播放
timer = setTimeout(function(){
next.onclick();
play();
}, interval);
}
function stop(){
clearTimeout(timer);
}
next.onclick = function(){
if (animated) {
return;
}
if (index==5) { // 归位按钮
index = 1;
} else {
index += 1;
}
animate(-600);
showButtom();
}
prev.onclick = function(){
if (animated) {
return;
}
if (index == 1) {
index = 5;
} else {
index -= 1;
}
animate(-600);
showButtom();
}
for (var i = 0; i < buttom.length; i++) {
buttom[i].onclick = function(){
if (animated) {
return;
}
if (this.className == 'on') {// 显示的当前图片和要点击的按钮对应时，不执行下列操作
return;
}
// 点击按钮，跳到对应的目标图片
var myIndex = parseInt(this.getAttribute('index'));// getAttribute() 方法返回指定属性名的属性值
var offset = -600 * (myIndex - index);
animate(offset);
index = myIndex;
showButtom();
}
}
container.onmouseover = stop; // 当鼠标移到图片上时，清除自动播放
container.onmouseout = play; // 当鼠标离开图片时，开始自动播放
play();
}
</script>
</body>
</html>