下面看下js轮播图的实现代码，具体代码如下所示：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
* {
padding: 0;
margin: 0;
list-style: none;
border: 0;
}
.all {
width: 500px;
height: 200px;
padding: 7px;
border: 1px solid #ccc;
margin: 100px auto;
position: relative;
}
.screen {
width: 500px;
height: 200px;
overflow: hidden;
position: relative;
}
.screen li {
width: 500px;
height: 200px;
overflow: hidden;
float: left;
}
.screen ul {
position: absolute;
left: 0;
top: 0px;
width: 3000px;
}
.all ol {
position: absolute;
right: 10px;
bottom: 10px;
line-height: 20px;
text-align: center;
}
.all ol li {
float: left;
width: 20px;
height: 20px;
background: #fff;
border: 1px solid #ccc;
margin-left: 10px;
cursor: pointer;
}
.all ol li.current {
background: yellow;
}
#arr {
display: none;
}
#arr span {
width: 40px;
height: 40px;
position: absolute;
left: 5px;
top: 50%;
margin-top: -20px;
background: #000;
cursor: pointer;
line-height: 40px;
text-align: center;
font-weight: bold;
font-family: '黑体';
font-size: 30px;
color: #fff;
opacity: 0.3;
border: 1px solid #fff;
}
#arr #right {
right: 5px;
left: auto;
}
</style>
</head>
<body>
<div class="all" id='box'>
<div class="screen">
<ul>
<li><img src="/UploadFiles/2021-04-02/1.jpg">
补充：原生javascript实现banner图自动轮播切换
一般在做banner轮播图的时候都是用jquery，因为代码少，方便，不需要花费很长的时间去获取某个元素作为变量，然后再进行操作，只要一个$就搞定了。但是今天我用原生的javascript做了一下这个轮播效果，感觉还行，以下是部分js源代码，仅供参考！文章底部查看效果演示。
1、鼠标离开banner图，每隔2s切换一次；
2、鼠标滑过下方的小按钮，可以切换图片；
3、鼠标点击左右按钮，可以切换图片。
var oPic,oLi,anniu,aLi,aLength,num,timer,oG,_index,oSpan;
window.onload = function(){
oPic = document.getElementsByClassName("pic")[0];
oLi = oPic.getElementsByTagName("li");
anniu = document.getElementsByClassName("anniu")[0];
aLi = anniu.getElementsByTagName("li");
aLength = aLi.length;
num = 0;
oG = document.getElementsByClassName("g")[0];
oSpan = oG.getElementsByTagName("span");
oLeft = oSpan[0];
oRight = oSpan[1];
start();
oG.onmouseover = end;
oG.onmouseout = start;
for(var j=0; j<aLength; j++){
aLi[j].index = j;
aLi[j].onmouseover = change;
}
oRight.onclick = time;
oLeft.onclick = times;
}
//自动轮播开始或结束
function start(){
timer = setInterval(time,2000);
hide();
}
function end(){
clearInterval(timer);
show();
}
//图片切换++
function time(){
for(var i=0; i<aLength; i++){
oLi[i].style.display = "none";
aLi[i].className = "";
}
num++;
num = num % 4;
oLi[num].style.display = "block";
aLi[num].className = "on";
}
//图片切换--
function times(){
for(var i=0; i<aLength; i++){
oLi[i].style.display = "none";
aLi[i].className = "";
}
num--;
num = (num+4)%4;
oLi[num].style.display = "block";
aLi[num].className = "on";
}
//鼠标滑过按钮，图片轮播
function change(){
_index = this.index;
for(var k=0; k<aLength; k++){
aLi[k].className = "";
oLi[k].style.display = "none";
}
aLi[_index].className = "on";
oLi[_index].style.display = "block";
}
//左右按钮显示或隐藏
function show(){
oSpan[0].style.display = "block";
oSpan[1].style.display = "block";
}
function hide(){
oSpan[0].style.display = "none";
oSpan[1].style.display = "none";
}
以上所述是小编给大家介绍的使用原生的javascript来实现轮播图，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！