HTML顶部导航栏固定，左侧菜单栏固定，右侧内容区上下滚动
要实现您所描述的效果，可以使用CSS的position: fixed;属性来固定顶部导航栏和左侧菜单栏，并使用overflow: auto;在右侧内容区域内允许滚动。以下是一个简单的HTML和CSS示例：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Fixed Navbars Example</title>
<style>
body, html {
margin: 0;
padding: 0;
height: 100%;
}
.navbar {
position: fixed;
top: 0;
width: 100%;
background-color: #333;
color: white;
text-align: center;
padding: 10px 0;
}
.sidebar {
position: fixed;
top: 50px; /* Adjust this value to account for the height of the navbar */
left: 0;
height: 100%;
width: 200px; /* Adjust this value for the width of the sidebar */
background-color: #f2f2f2;
overflow-y: auto; /* Enable scrolling if the sidebar is too long */
}
.content {
margin-left: 210px; /* Adjust this value to account for the width of the sidebar */
padding: 20px;
overflow: auto; /* Enable scrolling if the content is too long */
background-color: #f9f9f9;
height: 100%;
}
</style>
</head>
<body>
<div class="navbar">Navbar</div>
<div class="sidebar">
<p>Sidebar Item 1</p>
<p>Sidebar Item 2</p>
<!-- Add more sidebar items as needed -->
</div>
<div class="content">
<p>Content goes here...</p>
<!-- Add more content as needed -->
</div>
</body>
</html>在这个例子中，.navbar 类使得导航栏固定在顶部。.sidebar 类使得左侧菜单栏固定并允许滚动。.content 类使得右侧内容区域始终保持固定宽度，并允许垂直和水平滚动。
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