我正在尝试将汉堡包菜单排在最前面#34;侧导航,以后用这个汉堡包切换sidenav(而不是用x关闭它)。
问题是z-index似乎被忽略了。为什么会这样,即使sidenav进来,我怎么能解决这个问题才能将汉堡带到前面呢?
function openNav() {
document.getElementById("myNav").style.width = "100%";
}
function closeNav() {
document.getElementById("myNav").style.width = "0%";
}

.overlay {
height: 100%;
width: 0;
position: fixed;
z-index: 1;
top: 0;
left: 0;
background-color: blue;
overflow-x: hidden;
transition: 0.5s;
}
.overlay-content {
position: relative;
top: 25%;
width: 100%;
text-align: center;
margin-top: 30px;
}
.overlay a {
padding: 8px;
text-decoration: none;
font-size: 36px;
color: #818181;
display: block;
transition: 0.3s;
}
.overlay a:hover, .overlay a:focus {
color: #f1f1f1;
}
.overlay .closebtn {
position: absolute;
top: 20px;
right: 45px;
font-size: 60px;
}
.front {
z-index: 1050;
}

<div id="myNav" class="overlay">
<a href="javascript:void(0)" class="closebtn" onclick="closeNav()">×</a>
<div class="overlay-content">
<a href="#">About</a>
<a href="#">Services</a>
<a href="#">Clients</a>
<a href="#">Contact</a>
</div>
</div>
<h2>Fullscreen Overlay Nav Example</h2>
<span class="front" style="font-size:30px;cursor:pointer" onclick="openNav()">☰ open</span>
&#13;
答案 0 :(得分:1)
请检查.front
的{{1}}媒体资源。
position
,position: static;
忽略position: initial;
。
如果您想在不更改位置的情况下提供z-index
,请更改为z-index
position: relative;
function openNav() {
document.getElementById("myNav").style.width = "100%";
}
function closeNav() {
document.getElementById("myNav").style.width = "0%";
}
.overlay {
height: 100%;
width: 0;
position: fixed;
z-index: 1;
top: 0;
left: 0;
background-color: blue;
overflow-x: hidden;
transition: 0.5s;
}
.overlay-content {
position: relative;
top: 25%;
width: 100%;
text-align: center;
margin-top: 30px;
}
.overlay a {
padding: 8px;
text-decoration: none;
font-size: 36px;
color: #818181;
display: block;
transition: 0.3s;
}
.overlay a:hover, .overlay a:focus {
color: #f1f1f1;
}
.overlay .closebtn {
position: absolute;
top: 20px;
right: 45px;
font-size: 60px;
}
.front {
position: absolute;
z-index: 1050;
}
答案 1 :(得分:1)
Z-index仅适用于定位元素,也仅适用于自己的堆叠上下文。 <span class="front" ...">☰ open</span>
未定位。您可以阅读Project
's property文章了解详情。可能重复:this。
答案 2 :(得分:1)
将front
课程添加到您的h2
元素,并将position: relative
添加到front
样式:
function openNav() {
document.getElementById("myNav").style.width = "100%";
}
function closeNav() {
document.getElementById("myNav").style.width = "0%";
}
&#13;
.overlay {
height: 100%;
width: 0;
position: fixed;
z-index: 1;
top: 0;
left: 0;
background-color: blue;
overflow-x: hidden;
transition: 0.5s;
}
.overlay-content {
position: relative;
top: 25%;
width: 100%;
text-align: center;
margin-top: 30px;
}
.overlay a {
padding: 8px;
text-decoration: none;
font-size: 36px;
color: #818181;
display: block;
transition: 0.3s;
}
.overlay a:hover, .overlay a:focus {
color: #f1f1f1;
}
.overlay .closebtn {
position: absolute;
top: 20px;
right: 45px;
font-size: 60px;
}
.front {
z-index: 1050;
position: relative;
}
&#13;
<div id="myNav" class="overlay">
<a href="javascript:void(0)" class="closebtn" onclick="closeNav()">×</a>
<div class="overlay-content">
<a href="#">About</a>
<a href="#">Services</a>
<a href="#">Clients</a>
<a href="#">Contact</a>
</div>
</div>
<h2 class="front">Fullscreen Overlay Nav Example</h2>
<span class="front" style="font-size:30px;cursor:pointer" onclick="openNav()">☰ open</span>
&#13;