本文实例讲述了JS实现头条新闻的经典轮播图效果。分享给大家供大家参考，具体如下：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
*{
margin:0;
padding:0;
list-style: none;
}
.box{
width: 665px;
height: 362px;
border: solid;
margin: 100px auto;
position:relative ;
}
.left{
width: 50px;
height: 50px;
border: solid white;
border-radius: 50%;
position: absolute;
line-height: 50px;
text-align: center;
font-size: 50px;
left:0px;
top:180px;
cursor: pointer;
color: white;
}
.right {
width: 50px;
height: 50px;
border: solid white;
border-radius: 50%;
position: absolute;
line-height: 50px;
text-align: center;
font-size: 50px;
right: 0px;
top: 180px;
cursor: pointer;
color: white;
}
ul{
width: 400px;
height: 50px;
margin:307px 188px;
position: absolute;
left:30px;
top:24px;
}
li{
width: 30px;
height: 30px;
border: solid 1px white;
border-radius: 50%;
float: left;
cursor: pointer;
line-height: 30px;
text-align: center;
color: white;
}
img{
display: none;
width: 665px;
height: 362px;
}
.act{display: block;
}
.active{
background: black;
}
</style>
</head>
<body>
<div class="box" id="box">
<img src="img/1.jpg" class="act">
<img src="img/2.jpg" >
<img src="img/3.jpg" >
<img src="img/4.jpg" >
<img src="img/5.jpg" >
<img src="img/6.jpg" >
<img src="img/7.jpg" >
<img src="img/8.jpg" >
<div class="left" id="left"> < </div>
<div class="right" id="right"> > </div>
<ul>
<li class="active">1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
</div>
<script>
window.onload=function () {
var arrLi=document.getElementsByTagName("li");
var arrImg=document.getElementsByTagName("img");
var oLeft=document.getElementById("left");
var oRight=document.getElementById("right");
var oBox=document.getElementById("box");
var num=0;
f=setInterval(abc,1000);
oBox.onmouseover=function () {
clearInterval(f)
}
oBox.onmouseout=function () {
f=setInterval(abc,1000);
}
for(x=0;x<arrLi.length;x++) {
arrLi[x].index=x;
arrLi[x].onmouseover=function () {
for(j=0;j<arrLi.length;j++){
arrLi[j].className="";
arrImg[j].className="";
}
this.className="active";
arrImg[this.index].className="act";
}
}
oLeft.onclick=function () {
num=num-1;
if(num<0){
num=arrImg.length-1
}
for(j=0;j<arrImg.length;j++){
arrImg[j].className="";
arrLi[j].className="";
}arrImg[num].className="act";
arrLi[num].className="active";
}
oRight.onclick=abc
function abc() {
num=num+1;
if(num>arrImg.length-1){
num=0
}
for(j=0;j<arrImg.length;j++){
arrImg[j].className="";
arrLi[j].className="";
}arrImg[num].className="act";
arrLi[num].className="active";
}
}
</script>
</body>
</html>
本机测试运行效果如下：
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希望本文所述对大家JavaScript程序设计有所帮助。
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