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59 lines
1.5 KiB
59 lines
1.5 KiB
1 month ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>页面指示器部分</title>
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</head>
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<body>
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<style>
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.container{
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width: 100%;
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height: 2000px;
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}
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.back-to-top{
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position: fixed;
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bottom: 100px;
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right: 100px;
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width: 80px;
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height: 80px;
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background-color: #000;
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color: #fff;
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border-radius: 50%;
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display: flex;
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justify-content: center;
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align-items: center;
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cursor: pointer;
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opacity: 0;
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transition: opacity 0.3s ease-in-out;
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}
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h1{
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font-size: 50px;
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text-align: center;
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}
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</style>
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<div class="container">
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<h1>Back To Top</h1>
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<div class="back-to-top">lll1</div>
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</div>
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<script>
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const backToTopBtn = document.querySelector('.back-to-top');
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window.addEventListener('scroll', () => {
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if (window.scrollY > 300) {
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backToTopBtn.style.opacity = 1;
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} else {
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backToTopBtn.style.opacity = 0;
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}
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});
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backToTopBtn.addEventListener('click', () => {
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window.scrollTo({
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top: 0,
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behavior:'smooth'
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});
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});
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</script>
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</body>
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</html>
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