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2016-04-05 10:25 302 查看

<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="http://cdn.bootcss.com/jquery/2.2.0/jquery.min.js"></script>
<script>
jQuery(document).ready(function($){
var offset = 300,
offset_opacity = 1200,
scroll_top_duration = 700,
$back_to_top = $('.cd-top');
$(window).scroll(function(){
( $(this).scrollTop() > offset ) ? $back_to_top.addClass('cd-is-visible') : $back_to_top.removeClass('cd-is-visible cd-fade-out');
if( $(this).scrollTop() > offset_opacity ) {
$back_to_top.addClass('cd-fade-out');
}
});
$back_to_top.on('click', function(event){
event.preventDefault();
$('body,html').animate({
scrollTop: 0 ,
}, scroll_top_duration
);
});

});
</script>
<style>
.cd-top {
display: inline-block;
height: 40px;
width: 40px;
position: fixed;
bottom: 40px;
right: 10px;
box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
overflow: hidden;
text-indent: 100%;
white-space: nowrap;
background: rgba(232, 98, 86, 0.8)
url(http://www.100sucai.com/img/demo/1335.svg) no-repeat center 50%;
visibility: hidden;
opacity: 0;
-webkit-transition: opacity .3s 0s, visibility 0s .3s;
-moz-transition: opacity .3s 0s, visibility 0s .3s;
transition: opacity .3s 0s, visibility 0s .3s;
}

.cd-top.cd-is-visible,.cd-top.cd-fade-out,.no-touch .cd-top:hover {
-webkit-transition: opacity .3s 0s, visibility 0s 0s;
-moz-transition: opacity .3s 0s, visibility 0s 0s;
transition: opacity .3s 0s, visibility 0s 0s;
}

.cd-top.cd-is-visible {
visibility: visible;
opacity: 1;
}

.cd-top.cd-fade-out {
opacity: .5;
}

.no-touch .cd-top:hover {
background-color: #e86256;
opacity: 1;
}
</style>
<title>Back To Top | Cody</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
返回顶部代码
<div style="height: 1500px;"></div>
<div class="cd-top">Top</div>
</body>
</html>

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