<!doctype html>
<html>
<head>
<meta charset="gb2312">
<title>webrx-title</title>
<script src="js/jquery-1.11.1.min.js"></script>
<style>
/*returnTop*/
p#back-to-top{
position:fixed;
display:none;
bottom:100px;
right:80px;
}
p#back-to-top a{
text-align:center;
text-decoration:none;
color:#d1d1d1;
display:block;
64px;
/*使用CSS3中的transition属性给跳转链接中的文字加入渐变效果*/
-moz-transition:color 1s;
-webkit-transition:color 1s;
-o-transition:color 1s;
}
p#back-to-top a:hover{
color:#979797;
}
p#back-to-top a span{
background-image:url(top1.png);
border-radius:6px;
display:block;
height:64px;
56px;
margin-bottom:5px;
/*使用CSS3中的transition属性给<span>标签背景颜色加入渐变效果*/
-moz-transition:background 1s;
-webkit-transition:background 1s;
-o-transition:background 1s;
}
#back-to-top a:hover span{
background-image:url(top1.png);
}
</style>
<script>
$(document).ready(function(e) {
//当滚动栏的位置处于距顶部100像素下面时。跳转链接出现，否则消失
$(function () {
$(window).scroll(function(){
if ($(window).scrollTop()>100){
$("#back-to-top").fadeIn(1500);
}
else
{
$("#back-to-top").fadeOut(1500);
}
});
//当点击跳转链接后。回到页面顶部位置
$("#back-to-top").click(function(){
$('body,html').animate({scrollTop:0},1000);
return false;
});
});
});
</script>
</head>
<body>
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aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>
aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>
aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>
aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>aaa<br>bb<br>
<p id="back-to-top"><a href="#top"><span></span>返回顶部</a></p>
</body>
</html>