<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>無標(biāo)題文檔</title>
<style>
.panel{overflow:hidden;width:100%;height:1000px;}
#return-top{position:fixed;bottom:10%;right:50px; width:60px;height:60px;background-color:#eee; text-align:center; display:none;}
#return-top a{text-decoration:none; }
</style>
<script src="js/jquery-1.8.3.min.js"></script>
</head>
<body>
<div class="panel" style="background-color:red;"></div>
<div class="panel" style="background-color:blue;"></div>
<div class="panel" style="background-color:yellow;"></div>
<div id="return-top"><a href="#">返回頂部</a></div>
<script>
$(function(){
$('#return-top').hide();
$(function(){
$(window).scroll(function(){
if($(window).scrollTop()>300){
$('#return-top').fadeIn(300);
}
else{$('#return-top').fadeOut(200);}
});
$('#return-top').click(function(){
$('body,html').animate({scrollTop:0},300);
return false;
})
})
})
</script>
</body>
</html>
作者：仰望星空的包子
來源：CSDN
原文：https://blog.csdn.net/sinat_21206105/article/details/52287654
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