<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style>
*{padding: 0;margin: 0;}
li{list-style: none;}
ul{width:1000px;margin: 0 auto;}
ul li{width: 490px;margin-top: 10px;}
ul li:nth-child(odd){
float: left;
}
ul li:nth-child(even){
float: right;
}
ul li img{width: 100%;}
ul:after {clear:both;content:'.';display:block;width: 0;height: 0;visibility:hidden;}
</style>
<link rel="stylesheet" href="css/animate.min.css" />
</head>
<body>
<ul>
<li class="animated"><img src="img/a1.png"></li>
<li class="animated"><img src="img/a2.png"></li>
</ul>
<ul class="one">
<li class="animated"><img src="img/a3.png"></li>
<li class="animated"><img src="img/a4.png"></li>
</ul>
<ul class="two">
<li class="animated"><img src="img/a1.png"></li>
<li class="animated"><img src="img/a2.png"></li>
</ul>
<ul class="thr">
<li class="animated"><img src="img/a3.png"></li>
<li class="animated"><img src="img/a4.png"></li>
</ul>
<ul class="for">
<li class="animated"><img src="img/a1.png"></li>
<li class="animated"><img src="img/a2.png"></li>
</ul>
<ul class="fiv">
<li class="animated"><img src="img/a3.png"></li>
<li class="animated"><img src="img/a4.png"></li>
</ul>
<ul class="a1">
<li class="animated"><img src="img/a1.png"></li>
<li class="animated"><img src="img/a2.png"></li>
</ul>
<ul class="a2">
<li class="animated"><img src="img/a3.png"></li>
<li class="animated"><img src="img/a4.png"></li>
</ul>
<ul class="a3">
<li class="animated"><img src="img/a1.png"></li>
<li class="animated"><img src="img/a2.png"></li>
</ul>
<ul class="a4">
<li class="animated"><img src="img/a3.png"></li>
<li class="animated"><img src="img/a4.png"></li>
</ul>
</body>
<script src="http://www.jq22.com/jquery/jquery-1.10.2.js"></script>
<script>
function ani(claname,type1,type2){
if(($("."+claname).offset().top - $(window).scrollTop())<$(window).height()){
$("."+claname).find("li").eq(0).addClass(type1);
$("."+claname).find("li").eq(1).addClass(type2);
};
$(window).scroll(function(){
if(($("."+claname).offset().top - $(window).scrollTop())<$(window).height()){
$("."+claname).find("li").eq(0).addClass(type1);
$("."+claname).find("li").eq(1).addClass(type2);
};
});
};
ani("one","bounceInLeft","bounceInRight");
ani("two","bounceIn","bounceIn");
ani("thr","fadeInDownBig","fadeInDownBig");
ani("for","bounceInUp","bounceInUp");
ani("fiv","rotateInDownLeft","rotateInDownRight");
ani("a1","zoomInLeft","zoomInRight");
ani("a2","bounceInUp","bounceInUp");
ani("a3","rotateInDownLeft","rotateInDownRight");
ani("a4","zoomInLeft","zoomInRight");
</script>
</html>