128 lines
3.0 KiB
HTML
128 lines
3.0 KiB
HTML
<!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 http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>淘宝头部定位2</title>
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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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list-style: none;
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outline: none;
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}
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body {
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height: 3000px;
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background: rosybrown;
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}
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.header {
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width: 100%;
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height: 60px;
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display: flex;
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justify-content: center;
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}
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.header ul {
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height: 100%;
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display: flex;
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margin-left: 10px;
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}
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.header li {
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display: flex;
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align-items: center;
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}
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.header input {
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width: 600px;
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height: 100%;
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border-top-left-radius: 10px;
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border-bottom-left-radius: 10px;
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border: 1px solid #39bc30;
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box-sizing: border-box;
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background: white;
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padding-left: 42px;
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}
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.header .btn {
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width: 116px;
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height: 100%;
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background: #39bc30;
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border-top-right-radius: 10px;
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border-bottom-right-radius: 10px;
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font-size: 16px;
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font-weight: 700;
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color: white;
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display: flex;
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align-items: center;
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justify-content: center;
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cursor: pointer;
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user-select: none;
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}
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.test {
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width: 100%;
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height: 60px;
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margin-bottom: 60px;
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}
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</style>
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</head>
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<body>
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<div class="test"></div>
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<div class="header">
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<input type="text" placeholder="请输入内容">
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<div class="btn">搜索</div>
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<ul class="list">
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<li>首页1</li>
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<li>首页2</li>
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<li>首页3</li>
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<li>首页4</li>
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</ul>
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</div>
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</body>
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<script>
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// 网页绑定滚动事件
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//获取跟动的距离
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// 大于某个值 给html固定定位，反之不加
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var body = $("body"),
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header = $(".header"),
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test = $(".test"),
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list = $(".list");
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body.onscroll = () => {
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var offsetTop = document.documentElement.scrollTop;
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console.log("offsetTop:", offsetTop);
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if (offsetTop > 60) {
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// header.style = `
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// position:"fixed"
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// top:"0"
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// background:"white"
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// `
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header.style.position = "fixed"
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header.style.top = "0"
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header.style.background = "white"
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} else {
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header.style.position = "static";
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header.style.background = "red";
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}
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}
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function $(className) {
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return document.querySelector(className)
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}
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function _(className) {
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return document.querySelectorAll(className)
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}
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</script>
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</html> |