html 回到顶部按钮|标签HTML
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<title>Testing Page</title>
<!-- Normalize.css -->
<link rel="stylesheet" href="https://necolas.github.io/normalize.css/6.0.0/normalize.css">
<style>
body{
padding:50px;
font-family: sans-serif;
}
ul{
padding:0;
list-style:none;
}
li{
width:150px;
height:300px;
background-color:pink;
border-bottom:4px solid white;
}
/* back to top button styles */
#back-to-top {
display:block;
display:none;
position: fixed;
bottom: 20px;
right: 100px;
background: rgb(0, 0, 0);
background: rgba(0, 0, 0, 0.7);
width: 50px;
height: 50px;
text-decoration: none;
-webkit-border-radius: 35px;
-moz-border-radius: 35px;
border-radius: 35px;
}
#back-to-top:before{
position: absolute;
content:'';
width:8px;
height:8px;
border:3px solid white;
border-right:none;
border-bottom:none;
left: 18px;
top: 21px;
transform-origin: 66% 66%;
transform: rotate(45deg);
transition: all 0.15s ease-in-out;
}
#back-to-top:hover {
background: rgba(0, 0, 0, 0.9);
}
#back-to-top:hover:before {
top:17px;
}
</style>
</head>
<body>
<a href="#" id="back-to-top">
</a>
<h1>Test Page</h1>
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js'></script>
<script>
$(document).ready(function(){
$(window).scroll(function(){
if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
$('#back-to-top').fadeIn(200);
} else {
$('#back-to-top').fadeOut(200);
}
})
$('#back-to-top').click(function(){
$('body,html').animate({
scrollTop : 0
}, 250);
})
})
</script>
</body>
</html>
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