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我想添加子菜单到这个下拉功能，但我有一点CSS的知识，我没有得到如何做到这一点。我想要的子菜单开到右侧，当光标放在它下面是关于它的CSS和HTML如何将子菜单添加到下拉菜单
CSS
ul.dark_menu {
list-style: none;
padding: 5px 1px;
font-family:'Segoe UI Light', 'Open Sans', Verdana, Arial, Helvetica, sans-serif;
font-weight: 200;
font-size: 16px;
letter-spacing: 0.01em;
font-smooth: always;
color: #000000;
line-height: 15px;
margin: auto;
width: 1018px;
position: relative;
background: #2B5797;
}
/* Blog johanes djogzs.blogspot.com */
ul.dark_menu:after {
content:"";
clear: both;
display: block;
overflow: hidden;
visibility: hidden;
width: 0;
height: 0;
}
ul.dark_menu li {
float: left;
position: relative;
margin: 1px;
}
/* Blog johanes djogzs.blogspot.com */
ul.dark_menu li a, ul.dark_menu li a:link {
color: #fafafa;
text-decoration: none;
display: block;
padding: 8px 26px;
-webkit-transition: all 0.2s ease;
-moz-transition: all 0.2s ease;
-o-transition: all 0.2s ease;
-ms-transition: all 0.2s ease;
transition: all 0.2s ease;
}
/* Blog johanes djogzs.blogspot.com */
ul.dark_menu li a:hover {
color: #fafafa;
-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;
}
/* Blog johanes djogzs.blogspot.com */
ul.dark_menu li a.selected {
border-right: 1px solid #ddd;
text-transform: uppercase;
margin-left: 10px;
}
ul.dark_menu li a.selected, ul.dark_menu li a:active {
color: #fafafa;
-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;
}
ul.dark_menu li ul {
display: none;
}
/* Blog johanes djogzs.blogspot.com */
ul.dark_menu li ul:before {
content:" ";
position: absolute;
display: block;
z-index: 1500;
left: 0;
top: -10px;
height: 10px;
width: 100%;
}
ul.dark_menu li ul {
-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;
top:55px;
}
ul.dark_menu li:hover ul {
position: absolute;
display: block;
z-index: 1000;
box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
left: 0;
border-radius: 0px 0px 5px 5px;
top: 37px;
padding: 5px 0;
list-style: none;
background: #fff;
}
/* Blog johanes djogzs.blogspot.com */
ul.dark_menu li ul li {
float: none;
margin:0px;
}
ul.dark_menu li ul li:first-child {
margin:0px;
border-top: 0 none;
}
ul.dark_menu li ul li:last-child {
border-bottom: 0 none;
}
/* Blog johanes djogzs.blogspot.com */
ul.dark_menu[data-role="dropdown"] > a::before {
position: absolute;
content:"^";
display: block;
font-size: 15px;
left: 100%;
margin-left: -20px;
top: 10px;
-webkit-transform: rotate(180deg);
-moz-transform: rotate(180deg);
-ms-transform: rotate(180deg);
-o-transform: rotate(180deg);
transform: rotate(180deg);
}
ul.dark_menu li ul li a, ul.dark_menu li ul li a:link {
color: #222;
display: block;
background: transparent none;
padding: 10px 25px 10px 25px;
white-space: nowrap;
}
ul.dark_menu li ul li a:hover {
background:#2D89EF;
-moz-transition: all 0.1s ease-in-out;
color:#fff;
-webkit-transition: all 0.1s ease-in-out;
}
/* Blog johanes djogzs.blogspot.com */
.menujohanes {
position:relative;
}
#search input[type="text"]:hover {
width:848px;
}
#search input[type="text"] {
background: #fff url("http://3.bp.blogspot.com/-uYZni0pIn-E/T-xY2vVu_-I/AAAAAAAACUY/ZMfR3_BvRFE/s1600/SEARCH_32x32-32.png")no-repeat center left;
font-size: 13px;
color: #222;
width: 0px;
padding: 10px 0px 11px 35px;
z-index: 9;
border: 1px solid #fff;
-webkit-transition: all 0.5s ease-in-out;
-moz-transition: all 0.5s ease-in-out;
margin-bottom: -1px;
position: absolute;
top: 0px;
right:27px;
}
#main4, #main5, #main6 {
width: 303px;
list-style-type: none;
float: left;
margin: 10px;
}
.main3 {
width:305px;
list-style-type: none;
padding-top: 10px;
float: left;
}
::-webkit-scrollbar {
height:12px;
background: #474747;
}
::-webkit-scrollbar-thumb {
background-color: #000;
}
HTML
<div class='menujohanes'>
<ul class='dark_menu'>
<li>
<a class='selected' expr:href='data:blog.homepageUrl' title='Home'>
Home
</a>
</li>
<li data-role='dropdown'>
<a href='#'>
Categories
</a>
<ul>
<li>
<a href='#'>
Lorem ipsum
</a>
</li>
<li>
<a href='#'>
Lorem ipsum
</a>
</li>
<li>
<a href='#'>
Lorem ipsum
</a>
</li>
<li>
<a href='#'>
Lorem ipsum
</a>
</li>
<li>
<a href='#'>
Download
</a>
</li>
<li>
<a href='#'>
Lorem ipsum
</a>
</li>
</ul>
</li>
</ul>
<form action='/search' id='search' method='get'>
<input name='q' placeholder='Search Somethings..' size='40' type='text'/>
</form>
</div>
请帮助，因为我在谷歌上搜索它，但没有理解如何将子菜单包括在内。
感谢
所以，你想要一个下拉菜单，选择上的任何选项，你希望其他下拉菜单打开一旁？ –
你可以使用[JSFiddle]（http://jsfiddle.net）来显示你的代码吗？ – Nekkoru