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77 lines
1.7 KiB
77 lines
1.7 KiB
<!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>仿京东导航</title>
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</head>
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<style>
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* {
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margin: 0;
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padding: 0;
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box-sizing: border-box;
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}
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.header {
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position: fixed;
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top: -80px;
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text-align: center;
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left: 0;
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width: 100%;
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height: 80px;
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background-color: #faaf86;
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color: #000;
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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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.content {
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overflow: hidden;
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width: 1000px;
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height: 2000px;
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background-color: #a3efa2;
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margin: 0 auto;
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}
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.sk {
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width: 300px;
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height: 300px;
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display: flex;
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justify-content: center;
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align-items: center;
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background-color: #faaf86;
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margin-top: 200px;
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}
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</style>
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<body>
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<div class="header">导航栏</div>
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<div class="content">
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<div class="sk">
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秒杀模块
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</div>
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</div>
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</div>
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<script>
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const sk = document.querySelector('.sk')
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const header = document.querySelector('.header')
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//页面滚动事件
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window.addEventListener('scroll', function () {
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const n = document.documentElement.scrollTop
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// if( n >= sk.offsetTop){
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// header.style.top = 0
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// }
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// else {
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// // header.style.top = '-80px'
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// // }
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//简写
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header.style.top = n >= sk.offsetTop ? 0 : '-80px'
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})
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</script>
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</body>
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</html> |