63 lines
1.5 KiB
HTML
63 lines
1.5 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</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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}
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body {
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height: 3000px;
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}
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.head {
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width: 100%;
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height: 60px;
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}
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.head_menu {
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width: 100%;
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height: 50px;
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background: #e3bcbc;
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/* margin: 0 auto; */
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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="head"> </div>
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<div class="head_menu"></div>
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</body>
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<script>
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// 给网页绑定滚动事件
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// 获取滚动条的滚动距离，然后拿滚动距离进行判断 document.documentElement.scrollTop
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// 大于 某个数值 ，给 html 定固定定位，反之不加
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var body = $("body"), head_menu = $(".head_menu");
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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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head_menu.style.position = "fixed"
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head_menu.style.top = "0"
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}else{
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head_menu.style.position = "static"
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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> |