如何 - 缩小滚动导航菜单

了解如何使用 CSS 和 JavaScript 调整滚动导航栏的大小。

如何缩小滚动导航栏

步骤1）添加HTML：

创建导航栏：

示例

<div id="navbar">
<a href="#default" id="logo">CompanyLogo</a>
<div id="navbar-right">
    <a class="active" href="#home">Home</a>
    <a href="#contact">Contact</a>
    <a href="#about">About</a>
</div>
</div>

步骤2）添加CSS：

导航栏样式：

示例

/* Create a sticky/fixed navbar */
#navbar {
overflow: hidden;
background-color: #f1f1f1;
padding: 90px 10px; /* Large padding which will shrink on scroll (using JS) */
transition: 0.4s; /* Adds a transition effect when the padding is decreased */
position: fixed; /* Sticky/fixed navbar */
width: 100%;
top: 0; /* At the top */
z-index: 99;
}

/* Style the navbar links */
#navbar a {
float: left;
color: black;
text-align: center;
padding: 12px;
text-decoration: none;
font-size: 18px;
line-height: 25px;
border-radius: 4px;
}

/* Style the logo */
#navbar #logo {
font-size: 35px;
font-weight: bold;
transition: 0.4s;
}

/* Links on mouse-over */
#navbar a:hover {
background-color: #ddd;
color: black;
}

/* Style the active/current link */
#navbar a.active {
background-color: dodgerblue;
color: white;
}

/* Display some links to the right */
#navbar-right {
float: right;
}

/* Add responsiveness - on screens less than 580px wide, display the navbar vertically instead of horizontally */
@media screen and (max-width: 580px) {
#navbar {
    padding: 20px 10px !important; /* Use !important to make sure that JavaScript doesn't override the padding on small screens */
}
#navbar a {
    float: none;
    display: block;
    text-align: left;
}
#navbar-right {
    float: none;
}
}

步骤 3) 添加 JavaScript：

示例

// When the user scrolls down 80px from the top of the document, resize the navbar's padding and the logo's font size
window.onscroll = function() {scrollFunction()};

function scrollFunction() {
if (document.body.scrollTop > 80 || document.documentElement.scrollTop > 80) {
    document.getElementById("navbar").style.padding = "30px 10px";
    document.getElementById("logo").style.fontSize = "25px";
} else {
    document.getElementById("navbar").style.padding = "80px 10px";
    document.getElementById("logo").style.fontSize = "35px";
}
}

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