返回顶部的html和js

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://ww...

<!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</title>
</head>
<body>
<style>
#goTopBtn {position: fixed;line-height:36px;width:36px;bottom:35px;height:36px;cursor:pointer;display:none;
background:url(images/back_to_top_white.gif);}
</style>
<br/>
<p style="text-align:center;font-family:Georgia, 'Times New Roman', Times, serif;font-size:24px;font-weight:bold;">***，how are you。
<br/>Just do what you want do!!!</p>
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<div id="goTopBtn"></div>
<script type="text/javascript" src="jQuery1.3.2.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>