在移动设备上运行良好，但在全屏模式下，我无法在悬停时选择下拉选项，因为该选项会消失。
我的代码：
$('.handle').on('click', function(){
$('nav ul').toggleClass('showing');
});body {
margin: 0;
padding: 0;
font-family: sans-serif;
}
.toggle,
[id^=drop] {
display: none;
}
/* Giving a background-color to the nav container. */
nav {
margin:0;
padding: 0;
background-color: #254441;
}
#logo {
display: block;
padding: 0 30px;
float: left;
font-size:20px;
line-height: 60px;
}
/* Since we'll have the "ul li" "float:left"
* we need to add a clear after the container. */
nav:after {
content:"";
display:table;
clear:both;
}
/* Removing padding, margin and "list-style" from the "ul",
* and adding "position:reltive" */
nav ul {
float: right;
padding:0;
margin:0;
list-style: none;
position: relative;
}
/* Positioning the navigation items inline */
nav ul li {
margin: 0px;
display:inline-block;
float: left;
background-color: #254441;
}
/* Styling the links */
nav a {
display:block;
padding:14px 20px;
color:#FFF;
font-size:17px;
text-decoration:none;
}
nav ul li ul li:hover { background: #000000; }
/* Background color change on Hover */
nav a:hover {
background-color: #000000;
}
/* Hide Dropdowns by Default
* and giving it a position of absolute */
nav ul ul {
display: none;
position: absolute;
/* has to be the same number as the "line-height" of "nav a" */
top: 60px;
}
/* Display Dropdowns on Hover */
nav ul li:hover > ul {
display:inherit;
}
/* Fisrt Tier Dropdown */
nav ul ul li {
width:170px;
float:none;
display:list-item;
position: relative;
}
/* Second, Third and more Tiers
* We move the 2nd and 3rd etc tier dropdowns to the left
* by the amount of the width of the first tier.
*/
nav ul ul ul li {
position: relative;
top:-60px;
/* has to be the same number as the "width" of "nav ul ul li" */
left:170px;
}
/* Change ' +' in order to change the Dropdown symbol */
li > a:after { content: ' +'; }
li > a:only-child:after { content: ''; }
/* Media Queries
--------------------------------------------- */
@media all and (max-width : 768px) {
#logo {
display: block;
padding: 0;
width: 100%;
text-align: center;
float: none;
}
nav {
margin: 0;
}
/* Hide the navigation menu by default */
/* Also hide the */
.toggle + a,
.menu {
display: none;
}
/* Stylinf the toggle lable */
.toggle {
display: block;
background-color: #254441;
padding:14px 20px;
color:#FFF;
font-size:17px;
text-decoration:none;
border:none;
}
.toggle:hover {
background-color: #000000;
}
/* Display Dropdown when clicked on Parent Lable */
[id^=drop]:checked + ul {
display: block;
}
/* Change menu item's width to 100% */
nav ul li {
display: block;
width: 100%;
}
nav ul ul .toggle,
nav ul ul a {
padding: 0 40px;
}
nav ul ul ul a {
padding: 0 80px;
}
nav a:hover,
nav ul ul ul a {
background-color: #000000;
}
nav ul li ul li .toggle,
nav ul ul a,
nav ul ul ul a{
padding:14px 20px;
color:#FFF;
font-size:17px;
}
nav ul li ul li .toggle,
nav ul ul a {
background-color: #212121;
}
/* Hide Dropdowns by Default */
nav ul ul {
float: none;
position:static;
color: #ffffff;
/* has to be the same number as the "line-height" of "nav a" */
}
/* Hide menus on hover */
nav ul ul li:hover > ul,
nav ul li:hover > ul {
display: none;
}
/* Fisrt Tier Dropdown */
nav ul ul li {
display: block;
width: 100%;
}
nav ul ul ul li {
position: static;
/* has to be the same number as the "width" of "nav ul ul li" */
}
}
@media all and (max-width : 330px) {
nav ul li {
display:block;
width: 94%;
}
}<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<body>
<nav>
<div id="logo">Your Logo here</div>
<label for="drop" class="toggle">Menu</label>
<input type="checkbox" id="drop" />
<ul class="menu">
<li><a href="#">Home</a></li>
<li>
<!-- First Tier Drop Down -->
<label for="drop-1" class="toggle">WordPress +</label>
<a href="#">WordPress</a>
<input type="checkbox" id="drop-1"/>
<ul>
<li><a href="#">Themes and stuff</a></li>
<li><a href="#">Plugins</a></li>
<li><a href="#">Tutorials</a></li>
</ul>
</li>
<li>
<!-- First Tier Drop Down -->
<label for="drop-2" class="toggle">Web Design +</label>
<a href="#">Web Design</a>
<input type="checkbox" id="drop-2"/>
<ul>
<li><a href="#">Resources</a></li>
<li><a href="#">Links</a></li>
<li>
<!-- Second Tier Drop Down -->
<label for="drop-3" class="toggle">Tutorials +</label>
<a href="#">Tutorials</a>
<input type="checkbox" id="drop-3"/>
<ul>
<li><a href="#">HTML/CSS</a></li>
<li><a href="#">jQuery</a></li>
<li><a href="#">Other</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#">Graphic Design</a></li>
<li><a href="#">Inspiration</a></li>
<li><a href="#">Contact</a></li>
<li><a href="#">About</a></li>
</ul>
</nav>
这是一个小提琴，所以你可以看到我在说什么：
请帮忙！答案 0 :(得分：0)
下拉菜单离导航更远。将nav ul ul更改为40px。它将下拉菜单移近导航栏，现在您可以选择下拉列表。
$('.handle').on('click', function(){
$('nav ul').toggleClass('showing');
}); body {
margin: 0;
padding: 0;
font-family: sans-serif;
}
.toggle,
[id^=drop] {
display: none;
}
/* Giving a background-color to the nav container. */
nav {
margin:0;
padding: 0;
background-color: #254441;
}
#logo {
display: block;
padding: 0 30px;
float: left;
font-size:20px;
line-height: 60px;
}
/* Since we'll have the "ul li" "float:left"
* we need to add a clear after the container. */
nav:after {
content:"";
display:table;
clear:both;
}
/* Removing padding, margin and "list-style" from the "ul",
* and adding "position:reltive" */
nav ul {
float: right;
padding:0;
margin:0;
list-style: none;
position: relative;
}
/* Positioning the navigation items inline */
nav ul li {
margin: 0px;
display:inline-block;
float: left;
background-color: #254441;
}
/* Styling the links */
nav a {
display:block;
padding:14px 20px;
color:#FFF;
font-size:17px;
text-decoration:none;
}
nav ul li ul li:hover { background: #000000; }
/* Background color change on Hover */
nav a:hover {
background-color: #000000;
}
/* Hide Dropdowns by Default
* and giving it a position of absolute */
nav ul ul {
display: none;
top: 20px;
padding-top: 20px;
}
/* Display Dropdowns on Hover */
nav ul li:hover > ul {
position: absolute;
display: block;
}
/* Fisrt Tier Dropdown */
nav ul ul li {
width:170px;
float:none;
display:list-item;
position: relative;
}
/* Second, Third and more Tiers
* We move the 2nd and 3rd etc tier dropdowns to the left
* by the amount of the width of the first tier.
*/
nav ul ul ul li {
position: relative;
top:-60px;
/* has to be the same number as the "width" of "nav ul ul li" */
left:170px;
}
/* Change ' +' in order to change the Dropdown symbol */
li > a:after { content: ' +'; }
li > a:only-child:after { content: ''; }
/* Media Queries
--------------------------------------------- */
@media all and (max-width : 768px) {
#logo {
display: block;
padding: 0;
width: 100%;
text-align: center;
float: none;
}
nav {
margin: 0;
}
/* Hide the navigation menu by default */
/* Also hide the */
.toggle + a,
.menu {
display: none;
}
/* Stylinf the toggle lable */
.toggle {
display: block;
background-color: #254441;
padding:14px 20px;
color:#FFF;
font-size:17px;
text-decoration:none;
border:none;
}
.toggle:hover {
background-color: #000000;
}
/* Display Dropdown when clicked on Parent Lable */
[id^=drop]:checked + ul {
display: block;
}
/* Change menu item's width to 100% */
nav ul li {
display: block;
width: 100%;
}
nav ul ul .toggle,
nav ul ul a {
padding: 0 40px;
}
nav ul ul ul a {
padding: 0 80px;
}
nav a:hover,
nav ul ul ul a {
background-color: #000000;
}
nav ul li ul li .toggle,
nav ul ul a,
nav ul ul ul a{
padding:14px 20px;
color:#FFF;
font-size:17px;
}
nav ul li ul li .toggle,
nav ul ul a {
background-color: #212121;
}
/* Hide Dropdowns by Default */
nav ul ul {
float: none;
position:static;
color: #ffffff;
/* has to be the same number as the "line-height" of "nav a" */
}
/* Hide menus on hover */
nav ul ul li:hover > ul,
nav ul li:hover > ul {
display: none;
}
/* Fisrt Tier Dropdown */
nav ul ul li {
display: block;
width: 100%;
}
nav ul ul ul li {
position: static;
/* has to be the same number as the "width" of "nav ul ul li" */
}
/*to overwrite desktop default behaviour*/
nav ul li > ul, nav ul li:hover > ul {
position: relative;
top: 0;
padding-top: 0;
}
}
@media all and (max-width : 330px) {
nav ul li {
display:block;
width: 94%;
}
} <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<body>
<nav>
<div id="logo">Your Logo here</div>
<label for="drop" class="toggle">Menu</label>
<input type="checkbox" id="drop" />
<ul class="menu">
<li><a href="#">Home</a></li>
<li>
<!-- First Tier Drop Down -->
<label for="drop-1" class="toggle">WordPress +</label>
<a href="#">WordPress</a>
<input type="checkbox" id="drop-1"/>
<ul>
<li><a href="#">Themes and stuff</a></li>
<li><a href="#">Plugins</a></li>
<li><a href="#">Tutorials</a></li>
</ul>
</li>
<li>
<!-- First Tier Drop Down -->
<label for="drop-2" class="toggle">Web Design +</label>
<a href="#">Web Design</a>
<input type="checkbox" id="drop-2"/>
<ul>
<li><a href="#">Resources</a></li>
<li><a href="#">Links</a></li>
<li>
<!-- Second Tier Drop Down -->
<label for="drop-3" class="toggle">Tutorials +</label>
<a href="#">Tutorials</a>
<input type="checkbox" id="drop-3"/>
<ul>
<li><a href="#">HTML/CSS</a></li>
<li><a href="#">jQuery</a></li>
<li><a href="#">Other</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#">Graphic Design</a></li>
<li><a href="#">Inspiration</a></li>
<li><a href="#">Contact</a></li>
<li><a href="#">About</a></li>
</ul>
</nav>
干杯
答案 1 :(得分：0)
这是因为您的下拉位置低于导航的悬停状态。而不是
nav ul ul {
display: none;
position: absolute;
top: 60px;
}
nav ul li:hover > ul {
display: inherit;
}
尝试更改为：
nav ul ul {
display: none;
top: 40px;
padding-top: 20px;
}
nav ul li:hover > ul {
position: absolute;
display: block;
}
要设置移动导航样式，请覆盖默认桌面行为
@media all and (max-width : 768px) {
nav ul li:hover > ul {
position: relative;
top: 0;
padding-top: 0;
}
}
示例：
$('.handle').on('click', function(){
$('nav ul').toggleClass('showing');
});body {
margin: 0;
padding: 0;
font-family: sans-serif;
}
.toggle,
[id^=drop] {
display: none;
}
/* Giving a background-color to the nav container. */
nav {
margin:0;
padding: 0;
background-color: #254441;
}
#logo {
display: block;
padding: 0 30px;
float: left;
font-size:20px;
line-height: 60px;
}
/* Since we'll have the "ul li" "float:left"
* we need to add a clear after the container. */
nav:after {
content:"";
display:table;
clear:both;
}
/* Removing padding, margin and "list-style" from the "ul",
* and adding "position:reltive" */
nav ul {
float: right;
padding:0;
margin:0;
list-style: none;
position: relative;
}
/* Positioning the navigation items inline */
nav ul li {
margin: 0px;
display:inline-block;
float: left;
background-color: #254441;
}
/* Styling the links */
nav a {
display:block;
padding:14px 20px;
color:#FFF;
font-size:17px;
text-decoration:none;
}
nav ul li ul li:hover { background: #000000; }
/* Background color change on Hover */
nav a:hover {
background-color: #000000;
}
/* Hide Dropdowns by Default
* and giving it a position of absolute */
nav ul ul {
display: none;
top: 40px;
padding-top: 20px;
}
/* Display Dropdowns on Hover */
nav ul li:hover > ul {
position: absolute;
display: block;
}
/* Fisrt Tier Dropdown */
nav ul ul li {
width:170px;
float:none;
display:list-item;
position: relative;
}
/* Second, Third and more Tiers
* We move the 2nd and 3rd etc tier dropdowns to the left
* by the amount of the width of the first tier.
*/
nav ul ul ul li {
position: relative;
top:-60px;
/* has to be the same number as the "width" of "nav ul ul li" */
left:170px;
}
/* Change ' +' in order to change the Dropdown symbol */
li > a:after { content: ' +'; }
li > a:only-child:after { content: ''; }
/* Media Queries
--------------------------------------------- */
@media all and (max-width : 768px) {
#logo {
display: block;
padding: 0;
width: 100%;
text-align: center;
float: none;
}
nav {
margin: 0;
}
/* Hide the navigation menu by default */
/* Also hide the */
.toggle + a,
.menu {
display: none;
}
/* Stylinf the toggle lable */
.toggle {
display: block;
background-color: #254441;
padding:14px 20px;
color:#FFF;
font-size:17px;
text-decoration:none;
border:none;
}
.toggle:hover {
background-color: #000000;
}
/* Display Dropdown when clicked on Parent Lable */
[id^=drop]:checked + ul {
display: block;
}
/* Change menu item's width to 100% */
nav ul li {
display: block;
width: 100%;
}
nav ul ul .toggle,
nav ul ul a {
padding: 0 40px;
}
nav ul ul ul a {
padding: 0 80px;
}
nav a:hover,
nav ul ul ul a {
background-color: #000000;
}
nav ul li ul li .toggle,
nav ul ul a,
nav ul ul ul a{
padding:14px 20px;
color:#FFF;
font-size:17px;
}
nav ul li ul li .toggle,
nav ul ul a {
background-color: #212121;
}
/* Hide Dropdowns by Default */
nav ul ul {
float: none;
position:static;
color: #ffffff;
/* has to be the same number as the "line-height" of "nav a" */
}
/* Hide menus on hover */
nav ul ul li:hover > ul,
nav ul li:hover > ul {
display: none;
}
/* Fisrt Tier Dropdown */
nav ul ul li {
display: block;
width: 100%;
}
nav ul ul ul li {
position: static;
/* has to be the same number as the "width" of "nav ul ul li" */
}
/*to overwrite desktop default behaviour*/
nav ul li > ul, nav ul li:hover > ul {
position: relative;
top: 0;
padding-top: 0;
}
}
@media all and (max-width : 330px) {
nav ul li {
display:block;
width: 94%;
}
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<body>
<nav>
<div id="logo">Your Logo here</div>
<label for="drop" class="toggle">Menu</label>
<input type="checkbox" id="drop" />
<ul class="menu">
<li><a href="#">Home</a></li>
<li>
<!-- First Tier Drop Down -->
<label for="drop-1" class="toggle">WordPress +</label>
<a href="#">WordPress</a>
<input type="checkbox" id="drop-1"/>
<ul>
<li><a href="#">Themes and stuff</a></li>
<li><a href="#">Plugins</a></li>
<li><a href="#">Tutorials</a></li>
</ul>
</li>
<li>
<!-- First Tier Drop Down -->
<label for="drop-2" class="toggle">Web Design +</label>
<a href="#">Web Design</a>
<input type="checkbox" id="drop-2"/>
<ul>
<li><a href="#">Resources</a></li>
<li><a href="#">Links</a></li>
<li>
<!-- Second Tier Drop Down -->
<label for="drop-3" class="toggle">Tutorials +</label>
<a href="#">Tutorials</a>
<input type="checkbox" id="drop-3"/>
<ul>
<li><a href="#">HTML/CSS</a></li>
<li><a href="#">jQuery</a></li>
<li><a href="#">Other</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#">Graphic Design</a></li>
<li><a href="#">Inspiration</a></li>
<li><a href="#">Contact</a></li>
<li><a href="#">About</a></li>
</ul>
</nav>
答案 2 :(得分：0)
你有这条规则：
nav ul ul {
display: none;
position: absolute;
/* has to be the same number as the "line-height" of "nav a" */
top: 60px;
}
如果您将top: 60px;更改为top: 40px;，则会向上移动，以便可以选择。
这是一个小提琴：http://jsfiddle.net/hm41j6u1/1/