Question

我做了这个页面

* {
	box-sizing: border-box;
}

/* Navbar */

nav {
	background: #4D636F;
	max-height: 51px;
	margin: 0;
	overflow: hidden;
	padding: 0;
}

nav a {
	text-decoration: none;
}

nav span.badge {
	position: absolute;
	font-size: 12px;
	top: 5px;
	right: 6;
	background-color: #4CAF50;
	padding: 1px 4px;
	border-radius: 50%;
}

nav .logo {
	background: #3A4B53;
	float: left;
	font-size: 18px;
	padding: 12px 18px;
	color: #fff;
	cursor: pointer;
}

nav .logo i {
	margin-right: 13px;
}

nav ul {
	list-style-type: none;
	margin: 0;
	padding-top: 12px;
}

nav ul li {
	display: inline;
}

nav ul li a {
	color: #fff;
	padding: 12px 18px;
	font-size: 18px;
	transition: all 0.2s ease;
}

nav ul li a:hover {
	color: #444;
	background-color: white;
}

nav .right {
	float: right;
}

nav .right a img {
	width: 25px;
	height: 25px;
	border-radius: 50%;
	margin-bottom: 8px;
}

li.dropdown {
	position: relative;
}

.dropdown-menu {
	position: absolute;
	background-color: #f9f9f9;
	min-width: 160px;
	padding: 0;
	top: 20px;
	z-index: 1;
	left: 0;
	box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2)
}

.dropdown-menu a {
	color: #444;
    text-align: left;
    padding: 0;
    display: block;
}

/* Navbar ends */

<link href="http://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet"/>
<nav id="myNav">
	<div class="logo">
		<span><i class="fa fa-home" aria-hidden="true"></i>Logo</span>
	</div>
	<ul>
		<li><a href="#"><i class="fa fa-globe" aria-hidden="true"></i></a></li>
		<li><a href="#"><i class="fa fa-user" aria-hidden="true"></i></a></li>
		<li><a href="#"><i class="fa fa-envelope" aria-hidden="true"></i></a></li>
		<li class="dropdown">
			<a href="#" style="position: relative;"><i class="fa fa-bell"></i>
				<span class="badge">3</span>
			</a>
			<div class="dropdown-menu">
				<a href="#">One</a>
				<a href="#">One</a>
				<a href="#">One</a>
			</div>
		</li>
		<li class="right"><a href="#"><img src="images/profile.png" align="middle"></a></li>
	</ul>

</nav>

查看的问题是下拉菜单无法正确显示。我把它做成绝对的，它有z-index：1 :(

我知道我没有让它可以恢复但是我希望它出现然后我会处理它。

我觉得代码没有任何问题，但输出说不然。

我做错了什么？我该怎么做才能做到对不对？

Answer 1

您的问题是导航中的overflow: hidden

* {
	box-sizing: border-box;
}

/* Navbar */

nav {
	background: #4D636F;
	max-height: 71px;
	margin: 0;
	padding: 0;
}

nav a {
	text-decoration: none;
}

nav span.badge {
	position: relative;
	font-size: 12px;
	top: -11px;
    height: 15px;
	background-color: #4CAF50;
	padding: 2px 6px;
	border-radius: 50%;
}

nav .logo {
	background: #3A4B53;
	float: left;
	font-size: 18px;
	padding: 12px 18px;
	color: #fff;
	cursor: pointer;
}

nav .logo i {
	margin-right: 13px;
}

nav ul {
	list-style-type: none;
	margin: 0;
    line-height: 45px
}

nav ul li {
	display: inline;
}

nav ul li a {
	color: #fff;
	padding: 12px 18px;
	font-size: 18px;
	transition: all 0.2s ease;
}

nav ul li a:hover {
	color: #444;
	background-color: white;
}

nav .right {
	float: right;
}

nav .right a img {
	width: 25px;
	height: 25px;
	border-radius: 50%;
	margin-bottom: 8px;
}

li.dropdown {
	position: relative;
}

.dropdown-menu {
	position: absolute;
	background-color: #f9f9f9;
	min-width: 160px;
	padding: 0;
	top: 31px;
	z-index: 1;
	left: 0;
	box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2)
}

.dropdown-menu a {
	color: #444;
    text-align: left;
    padding: 0;
    display: block;
}

/* Navbar ends */

<link href="http://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet"/>
<nav id="myNav">
	<div class="logo">
		<span><i class="fa fa-home" aria-hidden="true"></i>Logo</span>
	</div>
	<ul>
		<li><a href="#"><i class="fa fa-globe" aria-hidden="true"></i></a></li>
		<li><a href="#"><i class="fa fa-user" aria-hidden="true"></i></a></li>
		<li><a href="#"><i class="fa fa-envelope" aria-hidden="true"></i></a></li>
		<li class="dropdown">
			<a href="#" style="position: relative;"><i class="fa fa-bell"></i>
				<span class="badge">3</span>
			</a>
			<div class="dropdown-menu">
				<a href="#">One</a>
				<a href="#">One</a>
				<a href="#">One</a>
			</div>
		</li>
		<li class="right"><a href="#"><img src="images/profile.png" align="middle"></a></li>
	</ul>

</nav>

Answer 2

.dropdown-menu {
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  padding: 0;
  top: 31px;
  z-index: 1;
  left: 0;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  max-height: 71px;
  overflow-y: hidden;
}
.dropdown-menu :hover {
  overflow-y: visible;
}

我在网页上使用了几次。

下拉菜单无法正确显示

2 个答案: