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js 图片轮播（一）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>图片轮播（一）</title>
<style>
*{margin:0; padding:0;}
.div1{position:relative;height:100%;}
.div1 img{width:100%; position:relative; display:none;}
.div1 a{
font-size:50pt; color:#fff;
position:absolute;
text-decoration:none;
cursor:pointer;
display:inline-block;
width:100px; height:100px;
background:#cccccc;
filter:alpha(opacity=20);
-moz-opacity:0.2;
-khtml-opacity: 0.2;
opacity: 0.2;
line-height:100px;
text-align:center;
}
.a1{top:50%; left:10%;}
.a2{top:50%; left:90%;}
</style>
</head>
<body>
<div class="div1" id="div1">
<img src="http://www.mamicode.com/images/1.jpg" style="display:block" />
<img src="http://www.mamicode.com/images/2.jpg" />
<img src="http://www.mamicode.com/images/3.jpg" />
<img src="http://www.mamicode.com/images/4.jpg" />
<a class="a1" > < </a>
<a class="a2" > > </a>
</div>
<script>
window.onload=function(){
var oDiv1=document.getElementById("div1");
var oimgs=oDiv1.getElementsByTagName("img");
var oA=oDiv1.getElementsByTagName("a");
oA[0].onclick=function(){
var i=fnD(oimgs);
if(i===0){
return;
}
oimgs[i].style.display="none";
oimgs[i-1].style.display="block";
return;
}
oA[1].onclick=function(){
var i=fnD(oimgs);
if(i===3){
return;
}
oimgs[i].style.display="none";
oimgs[i+1].style.display="block";
return;
}
}
//获取当前图片的下标
function fnD(images){
for(var i=0;i<images.length;i++){
if(images[i].style.display===‘block‘){
return i;
}
}
}
</script>
</body>
</html>
js 图片轮播（一）