CSS+jQuery实现的一个放大缩小动画效果

今天帮朋友写了一些代码,自己觉得写着写着，好几个版本以后，有点满意，于是就贴出来。
都是定死了的。因为需求就只有4个元素。如果是要用CSS的class来处理，那就需要用到CSS3动画了。

<!DOCTYPE html> 
<html> 
<head> 
<title> CSS+jQuery动画效果 </title> 
<meta name="Generator" content="EditPlus"> 
<meta name="Author" content="铁锚"> 
<style> 
body{ 
z-index: 0; 
width: 100%; 
min-height: 400px; 
} 
.pages{ 
position: absolute; 
} 
.current{ 
position: absolute; 
z-index: 12 !important; 
left: 0px !important; 
} 
.page1{ 
background-color: #a5cfff; 
z-index: 1; 
width: 300px; 
height:280px; 
top: 100px; 
left: 0px; 
} 
.page2{ 
background-color: #b1ca54; 
z-index: 2; 
width: 250px; 
height:270px; 
top: 160px; 
left: 0px; 
} 
.page3{ 
background-color: #c2c6c9; 
z-index: 3; 
width: 200px; 
height:260px; 
top: 220px; 
left: 0px; 
} 
.page4{ 
background-color: #ef9e9c; 
z-index: 4; 
width: 150px; 
height:250px; 
top: 250px; 
left: 0px; 
} 
</style> 
<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.min.js"></script> 
<script> 
$(function(){ 
// 增长 
function increase($div,e){ 
var style = $div.attr("style"); 
$div.addClass("current").attr("styleold",style); 
// 
$div.stop(); 
$div.animate({ 
opacity:0.9, 
width:"400px", 
height: "400px", 
top: "100px", 
left: "0px" 
},600) 
.animate({ 
opacity:1.0 
},30); 

e.stopPropagation(); 
return false; 
}; 
// 还原 
function resize(e){ 
// 所有的都移除 
var $page1 = $(".current.page1") ; 
$page1.stop(); 
$page1.animate({ 
opacity:1.0, 
width:"300px", 
height: "280px", 
top: "100px", 
left: "0px" 
},600,null,function(){ 
$page1.removeClass("current").attr("style",""); 
}); 

var $page2 = $(".current.page2") ; 
$page2.stop(); 
$page2.animate({ 
opacity:1.0, 
width:"250px", 
height: "270px", 
top: "160px", 
left: "0px" 
},600,null,function(){ 
$page2.removeClass("current").attr("style",""); 
}); 

var $page3 = $(".current.page3") ; 
$page3.stop(); 
$page3.animate({ 
opacity:1.0, 
width:"200px", 
height: "260px", 
top: "220px", 
left: "0px" 
},600,null,function(){ 
$page3.removeClass("current").attr("style",""); 
}); 

var $page4 = $(".current.page4") ; 
$page4.stop(); 
$page4.animate({ 
opacity:1.0, 
width:"150px", 
height: "250px", 
top: "250px", 
left: "0px" 
},600,null,function(){ 
$page4.removeClass("current").attr("style",""); 
}); 

e.stopPropagation(); 
return false; 
}; 
// 
$("#button1").unbind("mouseover").bind("mouseover",function(e){ 
// 
var $page1 = $(".page1"); 
// 添加特定的 
return increase($page1,e); 

}).unbind("mouseout").bind("mouseout",function(e){ 
return resize(e); 

}); 
// 
$("#button2").unbind("mouseover").bind("mouseover",function(e){ 
// 
var $page2 = $(".page2"); 
// 添加特定的 
return increase($page2,e); 

}).unbind("mouseout").bind("mouseout",function(e){ 
return resize(e); 
}); 
// 
$("#button3").unbind("mouseover").bind("mouseover",function(e){ 
// 
var $page3 = $(".page3"); 
// 添加特定的 
return increase($page3,e); 

}).unbind("mouseout").bind("mouseout",function(e){ 
return resize(e); 
}); 
// 
$("#button4").unbind("mouseover").bind("mouseover",function(e){ 
// 
var $page4 = $(".page4"); 
// 添加特定的 
return increase($page4,e); 

}).unbind("mouseout").bind("mouseout",function(e){ 
return resize(e); 
}); 

// 
$(".pages").unbind("mouseover").bind("mouseover",function(e){ 
// 
var $this = $(this); 
// 添加特定的 
return increase($this,e); 
}).unbind("mouseout").bind("mouseout",function(e){ 
// 所有的都移除 
return resize(e); 
}); 
// 
$("body").click(function(e){ 
// 所有的都移除 
return resize(e); 
}); 
}); 
</script> 
</head> 

<body> 
<div class="pages page1">page1</div> 
<div class="pages page2">page2</div> 
<div class="pages page3">page3</div> 
<div class="pages page4">page4</div> 

<div style="background-color: #a5cfff;"> 
<button id="button1">第一页</button> 
<button id="button2">第2页</button> 
<button id="button3">第3页</button> 
<button id="button4">第4页</button> 
</div> 
</body> 
</html> 