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72 lines
2.0 KiB
72 lines
2.0 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>Document</title>
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</head>
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<body>
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<div class="header">
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我是头部
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</div>
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<div class="main">
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<div class="content">
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秒杀模块
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</div>
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</div>
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<!--回到顶部按钮-->
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<div id="toTop" style="position: fixed; bottom: 70px; right: 50px; border-radius: 50%; background-color: rgba(0,0,0,0.1); height: 30px;width: 30px; display: none;flex-direction: column; justify-content: center; align-items: center;">
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<img src="./assets/top.png" style="height: 20px; width: 20px;" alt="">
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</div>
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</body>
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<style>
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.header{
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position: fixed;
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top: -80px;
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left: 0;
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width: 100%;
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height: 80px;
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background-color: skyblue;
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text-align: center;
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color: #fff;
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line-height: 80px;
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font-size: 30px;
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transition: all 0.3s;
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}
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.main{
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height: 1800px;
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width: 1000px;
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background-color: pink;
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}
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.content{
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position: absolute;
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top: 500px;
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background-color: gray;
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}
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</style>
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<script>
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const content = document.querySelector('.content')
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const header = document.querySelector('.header')
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const toTop = document.querySelector('#toTop')
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window.addEventListener('scroll',function(){
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const n = document.documentElement.scrollTop
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let viewScrollTop = document.documentElement.scrollTop
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if(n>=content.offsetTop){
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header.style.top = 0
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}else{
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header.style.top = '-80px'
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}
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if(viewScrollTop>400){
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toTop.style.display = 'flex'
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}else{
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toTop.style.display = 'none'
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}
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})
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toTop.addEventListener('click',()=>{
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document.documentElement.scrollTop = 0
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})
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</script>
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</html>
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