编程字典

源代码

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>编程字典</title>
  <style>
    body {margin:0;}
    ul {
        list-style-type: none;
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #333;
        position: fixed;
        top: 0;
        width: 100%;
    }

li {
        float: left;
    }

li a {
        display: block;
        color: white;
        text-align: center;
        padding: 14px 16px;
        text-decoration: none;
    }

li a:hover:not(.active) {
        background-color: #111;
    }

.active {
        background-color: #4CAF50;
    }
  </style>
</head>
<body>

<ul>
    <li><a class="active" href="#home">Home</a></li>
    <li><a href="#news">News</a></li>
    <li><a href="#contact">Contact</a></li>
    <li><a href="#about">About</a></li>
  </ul>

<div style="padding:20px;margin-top:30px;background-color:#1abc9c;height:1500px;">
  <h1>固定顶部导航栏</h1>
  <h2>滚动此页查看效果</h2>
  <h2>滚动时，导航栏将停留在页面的顶部.</h2>

</body>
</html>

运行结果