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jquery动态回到顶部特效

2014-05-09 17:33 423 查看
<!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(/jscss/demoimg/201212/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="/ajaxjs/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>
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