在线下单小程序_js完成幻灯片轮播图

本文实例为大家分享了js实现幻灯片轮播图的具体代码，供大家参考，具体内容如下

选取了五张图片 放入div中，然后是左右箭头，以及按钮，代码如下

 !DOCTYPE html 
 html lang="en" 
 head 
 meta charset="UTF-8" 
 title 轮播图 /title 
 link href="../css/轮播图.css" rel="stylesheet" 
 /head 
 body 
 div id="box" 
 img src="../image/car-1.jpg" 
 img src="../image/car-2.jpg" 
 img src="../image/car-3.jpg" 
 img src="../image/car-4.jpg" 
 img src="../image/car-5.jpg" 
 div 
 a href="javacript:void(0);" /a 
 a href="javacript:void(0);" /a 
 /div 
 li slideIndex="1" 1 /li 
 li slideIndex="2" 2 /li 
 li slideIndex="3" 3 /li 
 li slideIndex="4" 4 /li 
 li slideIndex="5" 5 /li 
 /ul 
 /div 
 script src="../js/轮播图.js" 
 /script 
 /body 
 /html 

2.css给div设置居中

将所有图片隐藏，设置箭头和小圆点的样式
代码如下

 margin:0;
 padding:0;
 text-decoration: none;
 list-style: none;
#box{
 width:800px;
 height: 500px;
 margin:50px auto 0px;
 position: relative;
#box img{
 width:800px;
 height: 500px;
 display: none;
 animation:fade 3s;
#box .arrow{
 width:800px;
 height: 80px;
 position: absolute;
 top:50%;
 margin-top: -40px;
#box .arrow .left,.right{
 display: inline-block;
 line-height: 80px;
 width: 50px;
 height:80px;
#box .arrow .left:hover{
 background:rgba(0,0,0,0.8);
#box .arrow .right:hover{
 background:rgba(0,0,0,0.8);
#box .arrow .right{
 text-align: right;
 position: absolute;
 right:0;
#box .arrow a{
 font-size: 50px;
 color: #ffffff;
#box .btn{
 position: absolute;
 bottom: 10px;
 left:50%;
 margin-left: -98.47px;
 text-align: center;
#box .btn li{
 text-align: center;
 margin:0 5px;
 padding: 10px;
 float:left;
 background:white;
 border-radius:20%;
 cursor: pointer;
 transition: background 2s ease;
#box .btn .on{
 background: #000;
 color:white;
@keyframes fade{
 from{
 opacity:.4;
 opacity:1;
}

3.js部分

js设定让当前图片显示display：block，其他图片隐藏display：none；

js代码如下

window.onload=function () {
 var left=document.getElementsByClassName("left")[0];
 var right=document.getElementsByClassName("right")[0];
 var btn=document.getElementsByClassName("btn")[0].getElementsByTagName("li");
 var box=document.getElementById("box");
 var slideIndex=1;
 var index=1;
 var timer;
 //图片切换函数
 showSlides(slideIndex);
 function showSlides(n) {
 var slides=document.getElementById("box").getElementsByTagName("img");
 for(var i=0;i slides.length;i++){
 slides[i].style.display="none";
 btn[i].className="";
 slides[slideIndex-1].style.display="block";
 btn[slideIndex-1].className="on"
 //箭头切换
 left. unction () {
 if(slideIndex 1) {
 slideIndex--;
 showSlides(slideIndex);
 }else {
 slideIndex=5;
 showSlides(slideIndex);
 right. unction () {
 if(slideIndex 5) {
 slideIndex++;
 showSlides(slideIndex);
 }else {
 slideIndex=1;
 showSlides(slideIndex);
 //btn切换
 for(var i=0;i btn.length;i++){
 btn[i]. unction () {
 var myslideIndex=this.getAttribute('slideIndex');
 // var myindex=parseInt(this.getAttribute("index"));
 slideIndex=myslideIndex;
 showSlides(slideIndex);
 //自动播放
 function play() {
 timer=setInterval(function () {
 right.onclick();
 },4000);
 function stop() {
 clearInterval(timer);
box.onmouseout=play;
 box. top;
 play();
}

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