jquery动态回到顶部特效-优快云博客

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jquery动态回到顶部特效 - www.update8.com</title>
</head>
<body>
<style>
#goTopBtn {position: fixed;line-height:36px;width:36px;bottom:35px;height:36px;cursor:pointer;display:none;
background:url(/js_img/20121229/back_to_top_white.gif);}
</style>
 
***，how are you。
 Just do what you want do!!!
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
<div id="goTopBtn"></div>
<script type="text/javascript" src="http://www.update8.com/images/js/jquery.min.js"></script>
<script type="text/javascript">
$(window).scroll(function(){
var sc=$(window).scrollTop();
var rwidth=$(window).width()
if(sc>0){
$("#goTopBtn").css("display","block");
$("#goTopBtn").css("left",(rwidth-36)+"px")
}else{
$("#goTopBtn").css("display","none");
}
})
$("#goTopBtn").click(function(){
var sc=$(window).scrollTop();
$('body,html').animate({scrollTop:0},500);
})
</script>
</body>
</html>