原生JavaScript实现轮播图
编程学习 2021-07-04 14:07www.dzhlxh.cn编程入门
这篇文章主要为大家详细介绍了原生JavaScript实现轮播图，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
本文实例为大家分享了JavaScript实现轮播图的具体代码，供大家参考，具体内容如下
效果：
代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
* {
margin: 0;
padding: 0;
}
ul,
li {
list-style: none;
}
.banner {
width: 1200px;
height: 535px;
border: 1px solid red;
margin: 0 auto;
position: relative;
}
.slider li {
position: absolute;
left: 0;
top: 0;
}
a {
width: 40px;
height: 50px;
background-color: rgba(0, 0, 0, 0.1);
font-size: 50px;
text-align: center;
line-height: 50px;
position: absolute;
text-decoration: none;
color: gray;
}
.btnl {
left: 0;
top: 50%;
margin-top: -15px;
}
.btnr {
right: 0;
top: 50%;
margin-top: -25px;
}
.tabs {
position: absolute;
bottom: 20px;
left: 50%;
margin-left: -75px;
}
.tabs li {
width: 15px;
height: 15px;
background-color: #ccc;
border-radius: 50%;
float: left;
margin-right: 10px;
}
</style>
</head>
<body>
<div class="banner">
<ul class="slider">
<li><img src="img/b1.jpg" alt="" /></li>
<li><img src="img/b2.jpg" alt="" /></li>
<li><img src="img/b3.jpg" alt="" /></li>
<li><img src="img/b4.jpg" alt="" /></li>
<li><img src="img/b5.jpg" alt="" /></li>
<li><img src="img/b6.jpg" alt="" /></li>
</ul>
<a href="javascript:void(0);" class="btnl">
<</a>
<a href="javascript:void(0);" class="btnr">></a>
<ul class="tabs">
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
</div>
<script type="text/javascript">
var banner = document.getElementsByClassName("banner")[0];
var slider = document.getElementsByClassName("slider")[0];
var li = slider.getElementsByTagName("li");
var btnl = document.getElementsByClassName("btnl")[0];
var btnr = document.getElementsByClassName("btnr")[0];
var tabs = document.getElementsByClassName("tabs")[0];
var btns = tabs.getElementsByTagName("li");
//初始化
btns[0].style.backgroundColor = "red";
for(var i = 0; i < li.length; i++) {
if(i == 0) {
continue;
} else {
li[i].style.opacity = 0;
}
}
var timer = setInterval(mover, 1000);
//声明一个变量，代表当前图片的下标
var num = 0;
function mover() {
num++;
if(num == li.length) {
num = 0;
}
for(var i = 0; i < li.length; i++) {
li[i].style.opacity = 0;
btns[i].style.backgroundColor = "#ccc";
}
li[num].style.opacity = 1;
btns[num].style.backgroundColor = "red";
}
function movel() {
num--;
if(num == -1) {
num = li.length - 1;
}
for(var i = 0; i < li.length; i++) {
li[i].style.opacity = 0;
btns[i].style.backgroundColor = "#ccc";
}
li[num].style.opacity = 1;
btns[num].style.backgroundColor = "red";
}
banner.onmouseover = function() {
clearInterval(timer)
}
banner.onmouseout = function() {
timer = setInterval(mover, 1000)
}
btnl.onclick = function(e) {
movel();
}
btnr.onclick = function(e) {
mover();
}
// 小圆点效果
for(var i = 0; i < btns.length; i++) {
btns[i].index = i;
btns[i].onmouseover = function() {
if(this.index == num) {
return;
} else {
for(var i = 0; i < li.length; i++) {
li[i].style.opacity = 0;
btns[i].style.backgroundColor = "#ccc";
}
li[this.index].style.opacity = 1;
btns[this.index].style.background="red";
num=this.index;
}
}
}
</script>
</body>
</html>
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