效果图可以看本站，我这里就上传了一张。
html部分:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1,
minimum-scale=1,maximum-scale=1,user-scalable=no" />
<!--引入CSS代码-->
<link rel="stylesheet" type="text/css" href="./css/index.css"/>
<!--引入Js代码-->
<script src="./js/index.js"></script>
<title>Js实现轮播图</title>
</head>
<body>
<div class="lunbo">
<div class="content">
<ul id="item">
<li class="item">
<a href="#"><img src="img/pic1.jpg" ></a>
</li>
<li class="item">
<a href="#"><img src="img/pic2.jpg" ></a>
</li>
<li class="item">
<a href="#"><img src="img/pic3.jpg" ></a>
</li>
<li class="item">
<a href="#"><img src="img/pic4.jpg" ></a>
</li>
<li class="item">
<a href="#"><img src="img/pic5.jpg" ></a>
</li>
</ul>
<div id="btn-left"><</div>
<div id="btn-right">></div>
<ul id="circle">
<li class="circle"></li>
<li class="circle"></li>
<li class="circle"></li>
<li class="circle"></li>
<li class="circle"></li>
</ul>
</div>
</div>
</body>
</html>
</html>CSS部分:
*{
margin: 0;
padding: 0;
}
a{
list-style: none;
}
li{
list-style: none;
}
.lunbo{
width: 100%;
}
.content{
width: 800px;
height: 300px;
margin: 20px auto;
position: relative;
}
#item{
width: 100%;
height: 100%;
}
.item{
position: absolute;
opacity: 0;
transition: all 1s;
}
.item.active{
opacity:1;
}
img{
width: 100%;
}
#btn-left{
width: 30px;
height: 69px;
font-size: 30px;
color: white;
background-color:rgba(0,0,0,0.4);
line-height: 69px;
padding-left:5px;
z-index: 10;/*始终显示在图片的上层*/
position: absolute;
left: 0;
top: 50%;
transform: translateY(-60%);/*使按钮向上偏移居中对齐*/
cursor: pointer;
opacity: 0;/*平时隐藏*/
}
.lunbo:hover #btn-left{
/*鼠标滑入，显示图标*/
opacity: 1;
}
#btn-right{
width: 26px;
height: 69px;
font-size: 30px;
color: white;
background-color:rgba(0,0,0,0.4);
line-height: 69px;
padding-left: 5px;
z-index: 10;
position: absolute;
right: 0;
top: 50%;
cursor: pointer;
opacity: 0;
transform: translateY(-60%);
}
.lunbo:hover #btn-right{
opacity: 1;
}
#circle{
height: 20px;
display: flex;
position: absolute;
bottom: 35px;
right: 25px;
}
.circle{
width: 10px;
height: 10px;
border-radius: 10px;
border: 2px solid white;
background: rgba(0,0,0,0.4);
cursor: pointer;
margin: 5px;
}
.white{
background-color: #FFFFFF;
}js部分:
window.onload=function(){
var items=document.getElementsByClassName("item");
var circles=document.getElementsByClassName("circle");
var leftBtn=document.getElementById("btn-left");
var rightBtn=document.getElementById("btn-right");
var content=document.querySelector('.content');
var index=0;
var timer=null;
//清除class
var clearclass=function(){
for(let i=0;i<items.length;i++){
items[i].className="item";
circles[i].className="circle";
circles[i].setAttribute("num",i);
}
}
/*只显示一个class*/
function move(){
clearclass();
items[index].className="item active";
circles[index].className="circle white";
}
//点击右边按钮切换下一张图片
rightBtn.onclick=function(){
if(index<items.length-1){
index++;
}
else{
index=0;
}
move();
}
//点击左边按钮切换上一张图片
leftBtn.onclick=function(){
if(index<items.length){
index--;
}
else{
index=items.length-1;
}
move();
}
//开始定时器，点击右边按钮，实现轮播
timer=setInterval(function(){
rightBtn.onclick();
},1500)
//点击圆点时，跳转到对应图片
for(var i=0;i<circles.length;i++){
circles[i].addEventListener("click",function(){
var point_index=this.getAttribute("num");
index=point_index;
move();
})
}
//鼠标移入清除定时器，并开启一个三秒的定时器，使慢慢转动
content.onmouseover=function(){
clearInterval(timer);
timer=setInterval(function(){
rightBtn.onclick();
},3000)
}
//鼠标移出又开启定时器
content.onmouseleave=function(){
clearInterval(timer);
timer=setInterval(function(){
rightBtn.onclick();
},1500)
}
}
评论一下？