HTML和CSS的新知识:下拉菜单未显示

Question

您好，我正在创建一个网站导航菜单。我已经在我的一个链接中实现了一个下拉选项，但根本没有显示。我确定这是我忽略的简单解决方案，任何帮助都将受到赞赏。

我仅包括相关的HTML和CSS代码。谢谢！

html：

<nav onmouseout="hide()">
<ul id="navMenu">
<li><a href="homepage.html">Home</a></li>
<li><span onmouseover="show(about)">About Us</span>
<div id="about" onmouseover="show(about)" style="visibilty:hidden;">
<a href="Darwin.html">Darwin</a>
<a href="Alex.html">Alex</a>
</div>
</li>
<li><a href="quote.html">Get a Quote</a></li>
<li><a href="contact.html">Contact Us</a></li>
</ul>
</nav>

CSS：

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #922e2e;
  margin-top: 4px;
  margin-bottom: 4px;
}
li {
  float: left;
}
li a, span {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}
li a:hover {
  background-color: #111;
}
#navMenu div {
  position: absolute;
  visibility: hidden;
}
#navMenu div a {
  display: block;
  width: 500px;
  height: 50px;
  background-color: #922e2e;
  color: black;
  text-align: center;
  margin-bottom: 0px;
}
#navMenu div:hover {
	display: block;
	background-color: #7e8182;
}

Answer 1

您可以使用CSS进行此操作，无需使用javaScript。在下面检查更新的摘要

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #922e2e;
  margin-top: 4px;
  margin-bottom: 4px;
}
li {
  float: left;
}
li a, span {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}
li a:hover {
  background-color: #111;
}
#navMenu div {
  position: absolute;
 display: none;
	background-color: #7e8182;
}
#navMenu div a {
  display: block;
  width: 200px;
  height: 50px;
  background-color: #922e2e;
  color: black;
  text-align: center;
  margin-bottom: 0px;
}
#navMenu li:hover div{
	display: block;
}

<nav>
<ul id="navMenu">
<li><a href="homepage.html">Home</a></li>
<li><span>About Us</span>
<div id="about">
<a href="Darwin.html">Darwin</a>
<a href="Alex.html">Alex</a>
</div>
</li>
<li><a href="quote.html">Get a Quote</a></li>
<li><a href="contact.html">Contact Us</a></li>
</ul>
</nav>

Answer 2

如果JS，只需纯CSS即可。希望这会有所帮助;）

nav
{
	margin-top:15px
}
nav ul
{
	list-style:none;
	position:relative;
	float:left;
	margin:0;
	padding:0
}
nav ul a
{
	display:block;
	color:#333;
	text-decoration:none;
	font-weight:700;
	font-size:12px;
	line-height:32px;
	padding:0 15px;
	font-family:"HelveticaNeue","Helvetica Neue",Helvetica,Arial,sans-serif
}
nav ul li
{
	position:relative;
	float:left;
	margin:0;
	padding:0
}
nav ul li.current-menu-item
{
	background:#ddd
}
nav ul li:hover
{
	background:#f6f6f6
}
nav ul div
{
	display:none;
	position:absolute;
	top:100%;
	left:0;
	background:#fff;
	padding:0
}
nav ul div li
{
	float:none;
	width:200px
}
nav ul div a
{
	line-height:120%;
	padding:10px 15px
}
nav ul li:hover > div
{
	display:block
}

<nav>
  <ul id="navMenu">
    <li><a href="homepage.html">Home</a></li>
    <li><a>About Us</a>
      <div id="about">
        <a href="Darwin.html">Darwin</a>
        <a href="Alex.html">Alex</a>
      </div>
    </li>
  <li><a href="quote.html">Get a Quote</a></li>
  <li><a href="contact.html">Contact Us</a></li>
  </ul>
</nav>