js实现幻灯片轮播图

2020年08月14日作者：星辰落海原文

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="../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 class="arrow">
 <a class="left" href="javacript:void(0);" ><</a>
 <a class="right" href="javacript:void(0);" >></a>
 </div>
 <ul class="btn">
 <li class="on" 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;
 }
 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();
}

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