You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
1.5 KiB
59 lines
1.5 KiB
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta charset="UTF-8">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
|
<title>页面指示器部分</title>
|
|
</head>
|
|
<body>
|
|
<style>
|
|
.container{
|
|
width: 100%;
|
|
height: 2000px;
|
|
}
|
|
.back-to-top{
|
|
position: fixed;
|
|
bottom: 100px;
|
|
right: 100px;
|
|
width: 80px;
|
|
height: 80px;
|
|
background-color: #000;
|
|
color: #fff;
|
|
border-radius: 50%;
|
|
display: flex;
|
|
justify-content: center;
|
|
align-items: center;
|
|
cursor: pointer;
|
|
opacity: 0;
|
|
transition: opacity 0.3s ease-in-out;
|
|
}
|
|
h1{
|
|
font-size: 50px;
|
|
text-align: center;
|
|
}
|
|
</style>
|
|
<div class="container">
|
|
<h1>Back To Top</h1>
|
|
|
|
<div class="back-to-top">lll1</div>
|
|
</div>
|
|
<script>
|
|
const backToTopBtn = document.querySelector('.back-to-top');
|
|
window.addEventListener('scroll', () => {
|
|
if (window.scrollY > 300) {
|
|
backToTopBtn.style.opacity = 1;
|
|
} else {
|
|
backToTopBtn.style.opacity = 0;
|
|
}
|
|
});
|
|
|
|
backToTopBtn.addEventListener('click', () => {
|
|
window.scrollTo({
|
|
top: 0,
|
|
behavior:'smooth'
|
|
});
|
|
});
|
|
</script>
|
|
|
|
</body>
|
|
</html> |