操作方法 - 粘性/附加导航栏

了解如何使用 CSS 和 JavaScript 创建"sticky" 导航栏。

亲自试一试 »

如何创建粘性导航栏

步骤1）添加HTML：

创建导航栏：

示例

<div id="navbar">
<a href="#home">Home</a>
<a href="#news">News</a>
<a href="#contact">Contact</a>
</div>

步骤2）添加CSS：

导航栏样式：

示例

/* Style the navbar */
#navbar {
overflow: hidden;
background-color: #333;
}

/* Navbar links */
#navbar a {
float: left;
display: block;
color: #f2f2f2;
text-align: center;
padding: 14px;
text-decoration: none;
}

/* Page content */
.content {
padding: 16px;
}

/* The sticky class is added to the navbar with JS when it reaches its scroll position */
.sticky {
position: fixed;
top: 0;
width: 100%;
}

/* Add some top padding to the page content to prevent sudden quick movement (as the navigation bar gets a new position at the top of the page (position:fixed and top:0) */
.sticky + .content {
padding-top: 60px;
}

步骤 3) 添加 JavaScript：

示例

// When the user scrolls the page, execute myFunction
window.onscroll = function() {myFunction()};

// Get the navbar
var navbar = document.getElementById("navbar");

// Get the offset position of the navbar
var sticky = navbar.offsetTop;

// Add the sticky class to the navbar when you reach its scroll position. Remove "sticky" when you leave the scroll position
function myFunction() {
if (window.pageYOffset >= sticky) {
navbar.classList.add("sticky")
} else {
navbar.classList.remove("sticky");
}
}

亲自试一试 »