css折叠的导航栏

要创建一个简单的CSS折叠的导航栏，你可以使用HTML和CSS。以下是一个基本的例子：

HTML:




<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Collapsible Navigation Bar</title>
<style>
  body {
    font-family: Arial, sans-serif;
  }
  .navbar {
    overflow: hidden;
    background-color: #333;
  }
  .navbar a {
    float: left;
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
  }
  .navbar a:hover {
    background-color: #ddd;
    color: black;
  }
  .navbar .icon {
    display: none;
  }
  @media screen and (max-width: 600px) {
    .navbar a:not(:first-child) {display: none;}
    .navbar a.icon {
      float: right;
      display: block;
    }
  }
  @media screen and (max-width: 600px) {
    .navbar.responsive {position: relative;}
    .navbar.responsive a.icon {
      position: absolute;
      right: 0;
      top: 0;
    }
    .navbar.responsive a {
      float: none;
      display: block;
      text-align: left;
    }
  }
</style>
</head>
<body>
 
<div class="navbar">
  <a href="#home">Home</a>
  <a href="#news">News</a>
  <a href="#contact">Contact</a>
  <a href="#about">About</a>
  <a href="javascript:void(0);" class="icon" onclick="myFunction()">&#9776;</a>
</div>
 
<script>
function myFunction() {
  var x = document.querySelector(".navbar");
  if (x.className === "navbar") {
    x.className += " responsive";
  } else {
    x.className = "navbar";
  }
}
</script>
 
</body>
</html>

CSS:




body {
  font-family: Arial, sans-serif;
}
 
.navbar {
  overflow: hidden;
  background-color: #333;
}
 
.navbar a {
  float: left;
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}
 
.navbar a:hover {
  background-color: #ddd;
  color: black;
}
 
.navbar .icon {
  display: none;
}
 
@media screen and (max-width: 600px) {
  .navbar a:not(:first-child) {display: none;}
  .navbar a.icon {
    float: right;
    display: block;
  }
}
 
@media screen and (max-width: 600px) {
  .navbar.responsive {position: relative;}
  .navbar.responsive a.icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .navbar.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
}

这段代码包括了一个简单的水平导航栏，以及一个可以折叠/展开的菜单图标。当屏幕宽度小于600像素时，除第一个链接外的所有链接会被隐藏，同时显示菜单图标，点击该图标可以切换导

css折叠的导航栏

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