<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>輪播圖</title>
<style>
*{
margin: 0;
padding: 0;
}
.box{
width: 800px;
height: 360px;
margin: 100px auto;
border: 1px solid #EEE;
position: relative;
}
.box ul li{
width:100%;
height: 360px;
list-style: none;
position: absolute;
top: 0;
font-size: 50px;
text-align: center;
line-height: 360px;
/*//display: none;*/
opacity: 0;
}
.box ul li:nth-child(1){
background-color: red;
}
.box ul li:nth-child(2){
background-color: yellow;
}
.box ul li:nth-child(3){
background-color: pink;
}
.box ul li:nth-child(4){
background-color: blue;
}
</style>
</head>
<body>
<div class="box" id='box'>
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
</ul>
</div>
</body>
</html>
<script>
var oBox = document.getElementById("box"),
oUl = oBox.getElementsByTagName('ul')[0],
oLi = oUl.getElementsByTagName('li'),
index = 0;
oLi[0].style.opacity = '1';
function autoPlay(){
index++;
if(index >= oLi.length){
index = 0;
};
chengLi(index)
}
function chengLi(cur){
for(var i = 0; i < oLi.length; i++){
oLi[i].style.opacity = '0';
}
// alert(cur)
oLi[cur].style.opacity = '1';
index = cur;
}
setInterval(autoPlay, 500);
</script>
