js实现幻灯片轮播图
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
1.html
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='https://www.haobala.com/css/轮播图.css' rel='stylesheet'></head><body><div id='box'> <img src='https://www.haobala.com/image/car-1.jpg'> <img src='https://www.haobala.com/image/car-2.jpg'> <img src='https://www.haobala.com/image/car-3.jpg'> <img src='https://www.haobala.com/image/car-4.jpg'> <img src='https://www.haobala.com/image/car-5.jpg'> <div class='arrow'> <a href='javacript:void(0);' ><</a> <a href='javacript:void(0);' >></a> </div> <ul class='btn'> <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='https://www.haobala.com/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; } to{ 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.onclick=function () { if(slideIndex>1) { slideIndex--; showSlides(slideIndex); }else { slideIndex=5; showSlides(slideIndex); } } right.onclick=function () { if(slideIndex<5) { slideIndex++; showSlides(slideIndex); }else { slideIndex=1; showSlides(slideIndex); } } //btn切换 for(var i=0;i<btn.length;i++){ btn[i].onclick=function () { 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.onmouseover=stop; play();}
精彩专题分享：jQuery图片轮播 JavaScript图片轮播 Bootstrap图片轮播
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持好吧啦网。
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