如何使用 CSS 和 JavaScript 创建滚动时固定/粘性标题?

cssweb developmentfront end technologyjavascript

要使用 CSS 和 JavaScript 创建滚动时固定/粘性标题，代码如下 −

示例

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
      margin: 0px;
      padding: 0px;
      height: 150vh; /*To produce scroll bar*/
   }
   .header {
      width: 100%;
      background-color: rgb(52, 21, 110);
      color: white;
      padding: 50px;
      font-size: 20px;
   }
   div.sticky {
      position: fixed;
      top: 0;
   }
</style>
</head>
<body>
<h1>Fixed Sticky on scroll example</h1>
<h2>Random Header Text</h2>
<h2>Randorm Header Text</h2>
<div class="header">Header Text</div>
<p style="font-size: 35px;">
Lorem ipsum dolor sit amet, consectetur adipisicing elit. Odit vel dolore delectus esse 
consequatur at nulla, consequuntur sint quas ea. Incidunt, ex. Consequatur ipsa earum 
veritatis fugiat iusto, doloremque sunt beatae quaerat laboriosam nemo soluta quidem porro 
quia. Dolore reprehenderit cum voluptatibus eius assumenda ipsam tenetur asperiores magni 
aliquid eligendi doloribus quidem ipsa et praesentium provident molestias quaerat laboriosam, 
veniam aspernatur repellendus. Debitis sapiente, odit iste voluptatibus nesciunt veritatis 
incidunt mollitia nostrum, vitae suscipit iusto molestias consequuntur rem facere perspiciatis 
ad! Ratione reiciendis asperiores aperiam vitae facilis accusantium non aliquid, facere 
cupiditate reprehenderit tempore veritatis eum accusamus omnis
tempora quos!
</p>
<script>
   window.onscroll = function() {
      setSticky();
   };
   var header = document.querySelector(".header");
   var sticky = header.offsetTop;
   function setSticky() {
      if (window.pageYOffset > sticky) {
         header.classList.add("sticky");
      }
      else {
         header.classList.remove("sticky");
      }
   }
</script>
</body>
</html>