在JavaScript中实现原生二级菜单通常涉及到HTML、CSS和JavaScript的结合使用。以下是一个简单的示例,展示如何创建一个基本的二级菜单。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>二级菜单示例</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<ul class="menu">
<li><a href="#">菜单1</a>
<ul class="submenu">
<li><a href="#">子菜单1-1</a></li>
<li><a href="#">子菜单1-2</a></li>
</ul>
</li>
<li><a href="#">菜单2</a>
<ul class="submenu">
<li><a href="#">子菜单2-1</a></li>
<li><a href="#">子菜单2-2</a></li>
</ul>
</li>
</ul>
<script src="script.js"></script>
</body>
</html>
/* styles.css */
.menu {
list-style-type: none;
padding: 0;
}
.menu > li {
display: inline-block;
position: relative;
}
.menu a {
display: block;
padding: 10px 20px;
text-decoration: none;
color: #333;
}
.submenu {
display: none;
position: absolute;
top: 100%;
left: 0;
background-color: #fff;
border: 1px solid #ccc;
list-style-type: none;
padding: 0;
min-width: 150px;
}
.submenu li {
display: block;
}
.submenu a:hover {
background-color: #f0f0f0;
}
// script.js
document.addEventListener('DOMContentLoaded', function() {
const menuItems = document.querySelectorAll('.menu > li');
menuItems.forEach(item => {
item.addEventListener('mouseenter', function() {
const submenu = this.querySelector('.submenu');
if (submenu) {
submenu.style.display = 'block';
}
});
item.addEventListener('mouseleave', function() {
const submenu = this.querySelector('.submenu');
if (submenu) {
submenu.style.display = 'none';
}
});
});
});
.submenu
类来控制子菜单的显示和隐藏。.submenu
类设置了display: none;
,并且在JavaScript中正确地切换了display
属性。position
属性设置为absolute
,并且父元素具有position: relative;
。通过这种方式,你可以创建一个简单而有效的二级菜单,提升用户体验。
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