练手小案例：用js实现二级导航

以下是一个简单的二级导航菜单的实现，使用JavaScript和CSS完成。

HTML:




<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>二级导航菜单</title>
<style>
  ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
  }
 
  li {
    float: left;
  }
 
  li a, .dropbtn {
    display: inline-block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
  }
 
  li a:hover, .dropdown:hover .dropbtn {
    background-color: #111;
  }
 
  .dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
  }
 
  .dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
  }
 
  .dropdown-content a:hover {background-color: #f1f1f1;}
 
  .dropdown:hover .dropdown-content {
    display: block;
  }
</style>
</head>
<body>
 
<ul>
  <li><a href="#home">首页</a></li>
  <li><a href="#news">新闻</a></li>
  <li class="dropdown">
    <a href="javascript:void(0)" class="dropbtn">更多</a>
    <div class="dropdown-content">
      <a href="#">链接1</a>
      <a href="#">链接2</a>
      <a href="#">链接3</a>
    </div>
  </li>
</ul>
 
<script>
// 这里可以添加更多的JavaScript代码来增强导航的功能，比如点击事件处理等
</script>
 
</body>
</html>

CSS:




ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}
 
li {
  float: left;
}
 
li a, .dropbtn {
  display: inline-block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}
 
li a:hover, .dropdown:hover .dropbtn {
  background-color: #111;
}
 
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}
 
.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}
 
.dropdown-content a:hover {background-color: #f1f1f1;}
 
.dropdown:hover .dropdown-content {
  display: block;
}

这个例子中，我们使用了一个简单的二级下拉菜单，当用户将鼠标悬停在“更多”选项上时，会展开显示链接。通过CSS我们定义了导

练手小案例：用js实现二级导航

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