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我正在为一个学校项目制作一个网站，并且从前有少量编码经验。我听说有可能只使用CSS来实现下拉菜单而不使用JavaScript。让下拉停留在悬停上
/* Configuration of menu width */
html body ul.sf-menu ul,
html body ul.sf-menu ul li {
width: 200px;
}
html body ul.sf-menu ul ul {
margin: 0 0 0 200px;
}
/* Framework for proper showing/hiding/positioning */
ul.sf-menu,
ul.sf-menu * {
margin: 0;
padding: 0;
}
ul.sf-menu {
display: block;
position: relative;
}
ul.sf-menu li {
display: block;
list-style: none;
float: left;
position: relative;
}
ul.sf-menu li:hover {
visibility: inherit;
/* fixes IE7 'sticky bug' */
}
ul.sf-menu a {
display: block;
position: relative;
}
ul.sf-menu ul {
position: absolute;
left: 0;
width: 150px;
top: auto;
left: -999999px;
}
ul.sf-menu ul a {
zoom: 1;
/* IE6/7 fix */
}
ul.sf-menu ul li {
float: left;
/* Must always be floated otherwise there will be a rogue 1px margin-bottom in IE6/7 */
width: 150px;
}
ul.sf-menu ul ul {
top: 0;
margin: 0 0 0 150px;
}
ul.sf-menu li:hover ul,
ul.sf-menu li:focus ul,
ul.sf-menu li.sf-hover ul,
ul.sf-menu ul li:hover ul,
ul.sf-menu ul li:focus ul,
ul.sf-menu ul li.sf-hover ul,
ul.sf-menu ul ul li:hover ul,
ul.sf-menu ul ul li:focus ul,
ul.sf-menu ul ul li.sf-hover ul,
ul.sf-menu ul ul ul li:hover ul,
ul.sf-menu ul ul ul li:focus ul,
ul.sf-menu ul ul ul li.sf-hover ul {
left: auto;
}
ul.sf-menu li:hover ul ul,
ul.sf-menu li:focus ul ul,
ul.sf-menu li.sf-hover ul ul,
ul.sf-menu ul li:hover ul ul,
ul.sf-menu ul li:focus ul ul,
ul.sf-menu ul li.sf-hover ul ul,
ul.sf-menu ul ul li:hover ul ul,
ul.sf-menu ul ul li:focus ul ul,
ul.sf-menu ul ul li.sf-hover ul ul,
ul.sf-menu ul ul ul li:hover ul ul,
ul.sf-menu ul ul ul li:focus ul ul,
ul.sf-menu ul ul ul li.sf-hover ul ul {
left: -999999px;
}
/* autoArrows CSS */
span.sf-arrow {
width: 7px;
height: 7px;
position: absolute;
top: 20px;
right: 5px;
display: block;
background: url(../images/arrows-white.png) no-repeat 0 0;
overflow: hidden;
/* making sure IE6 doesn't overflow and expand the box */
font-size: 1px;
}
ul ul span.sf-arrow {
right: 5px;
top: 20px;
background-position: 0 100%;
}
/* Theming the menu */
ul#nav {
float: left;
}
ul#nav ul {
background: #555;
margin-top: 5px;
padding-bottom: 15px;
}
ul#nav li a {
padding: 7px 25px 6px 25px;
font: 170%'Yanone Kaffeesatz', arial, sans-serif;
text-decoration: none;
color: #000;
margin-right: 2px;
}
ul#nav li a:hover,
ul#nav li a:focus,
ul#nav li.selected a,
ul#nav li.selected a:hover,
ul#nav li.selected a:focus {
color: #09D4FF;
text-shadow: none;
}
ul#nav ul li a {
color: #FFF;
}
ul#nav ul li a:hover {
color: #09D4FF;
margin-right: 2px;
}
/* Image Transitions */
ul#images {
margin: 0 15px 10px 0;
padding: 0;
list-style: none;
position: relative;
}
ul#images li {
display: block;
overflow: hidden;
padding: 0;
float: left;
width: 155px;
height: 300px;
}<nav>
<ul class="sf-menu" id="nav">
<li class="selected"><a href="index.html">Home</a>
</li>
<li><a href="form.html"> Form </a>
</li>
<li><a href="page.html">A Page</a>
</li>
<li><a href="another_page.html">Another Page</a>
</li>
<li><a href="#">Example Drop Down</a>
<ul>
<li><a href="#">Drop Down One</a>
</li>
<li><a href="#">Drop Down Two</a>
<ul>
<li>
<img src="arrows-white.png" />
</li>
<li><a href="#">Sub Drop Down One</a>
</li>
<li><a href="#">Sub Drop Down Two</a>
</li>
<li><a href="#">Sub Drop Down Three</a>
</li>
<li><a href="#">Sub Drop Down Four</a>
</li>
<li><a href="#">Sub Drop Down Five</a>
</li>
</ul>
</li>
<li><a href="#">Drop Down Three</a>
</li>
<li><a href="#">Drop Down Four</a>
</li>
<li><a href="#">Drop Down Five</a>
</li>
</ul>
</li>
<li><a href="contact.php">Contact Us</a>
</li>
</ul>
</nav>
您可以使用http://cssmenumaker.com/css-drop-down-menu – Apb