叠加导航是网页设计中广泛使用的导航样式。
它使导航覆盖整个屏幕上的菜单。
在这个片段中，我们将展示如何使用 JavaScript 创建、设计和触发全屏覆盖导航菜单。
我们只需要 openNav() 和 closeNav() 函数。
当我们单击 <span> 元素时，叠加层将打开：
function openNav() {
document.getElementById("nav").style.width = "100%";
}
当我们单击关闭符号时，叠加层将关闭：
function closeNav() {
document.getElementById("nav").style.width = "0%";
}
以下是全屏覆盖导航菜单的几个示例：
<!DOCTYPE html>
<html>
<head>
<title>文档的标题</title>
<style>
body {
font-family: 'Veranda', sans-serif;
}
span {
font-size: 22px;
cursor: pointer
}
.overlay {
height: 100%;
width: 0;
position: fixed;
z-index: 1;
top: 0;
left: 0;
background-color: #001536;
overflow-x: hidden;
transition: 0.5s;
}
.overlay-content {
position: relative;
top: 30%;
width: 100%;
text-align: center;
margin-top: 30px;
}
.overlay a {
padding: 10px;
text-decoration: none;
font-size: 32px;
color: #7792a3;
display: block;
transition: 0.4s;
}
.overlay a:hover,
.overlay a:focus {
color: #eeeeee;
}
.overlay .close {
position: absolute;
top: 10px;
right: 35px;
font-size: 50px;
}
@media screen and (max-height: 450px) {
.overlay a {
font-size: 20px
}
.overlay .closed {
font-size: 40px;
top: 15px;
right: 35px;
}
}
</style>
</head>
<body>
<div id="nav" class="overlay">
<a href="javascript:void(0)" class="closed" onclick="closeNav()">×</a>
<div class="overlay-content">
<a href="#">Books</a>
<a href="#">Quizzes</a>
<a href="#">Snippets</a>
<a href="#">Tools</a>
</div>
</div>
<span onclick="openNav()">☰ Click Here</span>
<script>
function openNav() {
document.getElementById("nav").style.width = "100%";
}
function closeNav() {
document.getElementById("nav").style.width = "0%";
}
</script>
</body>
</html>
让我们看另一个漂亮的全屏覆盖导航菜单示例：
<!DOCTYPE html>
<html>
<head>
<title>文档的标题</title>
<style>
body {
background-image: url("bg.png");
height: 500px;
background-position: center;
background-repeat: no-repeat;
background-size: cover;
position: relative;
}
.lower {
width: 340px;
margin: 30% auto;
padding: 35px;
background: #fcd8c2;
opacity: 0.8;
color: black;
box-shadow: inset 0 0 0 1px black;
border: 30px solid #fcd8c2;
}
.lower:hover {
background: #000000;
color: white;
box-shadow: inset 0 0 0 1px #ffffff;
border: 30px solid #000000;
}
input {
display: none;
}
.lower label {
text-transform: uppercase;
font-size: 40px;
text-align: center;
}
.lower label:hover {
cursor: pointer;
}
.overlay {
position: fixed;
width: 100%;
height: 100%;
top: 0;
left: 0;
background: rgba(0, 0, 0, 0.9);
}
.overlay label {
width: 58px;
height: 58px;
position: absolute;
right: 30px;
top: 40px;
background: url('cross.png');
z-index: 100;
cursor: pointer;
}
.overlay nav {
text-align: center;
position: relative;
top: 50%;
height: 60%;
font-size: 34px;
-webkit-transform: translateY(-50%);
transform: translateY(-50%);
}
.overlay ul {
list-style: none;
padding: 0;
margin: 0 auto;
display: inline-block;
height: 100%;
position: relative;
}
.overlay ul li {
display: block;
height: 20%;
height: calc(100%/5);
min-height: 54px;
}
.overlay ul li a {
font-weight: 300;
display: block;
color: white;
text-decoration: none;
-webkit-transition: color 0.2s;
transition: color 0.2s;
font-family: 'NotCourierSans';
text-transform: uppercase;
}
.overlay ul li a:hover,
.overlay ul li a:focus {
color: #f7bb97;
}
.lower~.overlay-hugeinc {
opacity: 0;
visibility: hidden;
-webkit-transition: opacity 0.5s, visibility 0s 0.5s;
transition: opacity 0.5s, visibility 0s 0.5s;
}
#op:checked~.overlay-hugeinc {
opacity: 1;
visibility: visible;
-webkit-transition: opacity 0.5s;
transition: opacity 0.5s;
}
.overlay-hugeinc nav {
-moz-perspective: 300px;
}
.overlay-hugeinc nav ul {
opacity: 0.4;
-webkit-transform: translateY(-25%) rotateX(35deg);
transform: translateY(-25%) rotateX(35deg);
-webkit-transition: -webkit-transform 0.5s, opacity 0.5s;
transition: transform 0.5s, opacity 0.5s;
}
#op:checked~.overlay-hugeinc nav ul {
opacity: 1;
-webkit-transform: rotateX(0deg);
transform: rotateX(0deg);
}
#op:not(:checked)~.overlay-hugeinc nav ul {
-webkit-transform: translateY(25%) rotateX(-35deg);
transform: translateY(25%) rotateX(-35deg);
}
</style>
</head>
<body>
<input type="checkbox" id="op"></input>
<div class="lower">
<label for="op">click the text</label>
</div>
<div class="overlay overlay-hugeinc">
<label for="op"></label>
<nav>
<ul>
<li><a href="#">Books</a></li>
<li><a href="#">Quizzes</a></li>
<li><a href="#">Snippets</a></li>
<li><a href="#">Tools</a></li>
<li><a href="#">String Functions</a></li>
</ul>
</nav>
</div>
</body>
</html>
日期：2020-06-02 22:16:15 来源：oir作者：oir