如何让产品中的子菜单滑动到页脚以上而不是它？ 所以我可以制作一个不同高度的子菜单，而不会使子菜单侧面页脚。 这是一个jsfiddle，就像我需要的演示.......
<div id='cssmenu'>
<ul>
<li><a href='#'><span>Home</span></a></li>
<li class='active has-sub'><a href='#'><span>Products</span></a>
<ul>
<li class='has-sub'><a href='#'><span>Product 1</span></a>
<ul>
<li><a href='#'><span>Sub Product</span></a></li>
<li class='last'><a href='#'><span>Sub Product</span></a></li>
</ul>
</li>
<li class='has-sub'><a href='#'><span>Product 2</span></a>
</li>
<li class='has-sub'><a href='#'><span>Product 2</span></a>
</li>
<li class='has-sub'><a href='#'><span>Product 2</span></a>
</li>
<li class='has-sub'><a href='#'><span>Product 2</span></a>
</li>
</ul>
</div>
<div class="footer">
<a href='www.google.com'>search in google </a>
</div>
@charset "UTF-8";
/* Some stylesheet reset */
#cssmenu > ul {
list-style: none;
margin: 0;
padding: 0;
vertical-align: baseline;
line-height: 1;
}
/* The container */
#cssmenu > ul {
display: block;
position: relative;
width: 150px;
}
/* The list elements which contain the links */
#cssmenu > ul li {
display: block;
position: relative;
margin: 0;
padding: 0;
width: 100%;
}
/* General link styling */
#cssmenu > ul li a {
/* Layout */
display: block;
position: relative;
margin: 0;
border-top: 1px dotted #fff;
border-bottom: 1px dotted #d9d9d9;
padding: 11px 20px;
/* Typography */
font-family: Helvetica, Arial, sans-serif;
color: #e4433c;
text-decoration: none;
text-transform: uppercase;
text-shadow: 0 1px 0 #fff;
font-size: 13px;
font-weight: 300;
/* Background & effects */
background: #eaeaea;
}
/* Rounded corners for the first link of the menu/submenus */
#cssmenu > ul li:first-child > a {
border-top-left-radius: 4px;
border-top-right-radius: 4px;
border-top: 0;
}
/* Rounded corners for the last link of the menu/submenus */
#cssmenu > ul li:last-child > a {
border-bottom-left-radius: 4px;
border-bottom-right-radius: 4px;
border-bottom: 0;
}
/* The hover state of the menu/submenu links */
#cssmenu > ul li a:hover,
#cssmenu > ul li:hover > a {
color: #ffffff;
text-shadow: 0 1px 0 rgba(0, 0, 0, 0.25);
background: #f23f37;
background: -webkit-linear-gradient(#f23f37, #e7180f);
background: -moz-linear-gradient(#f23f37, #e7180f);
background: linear-gradient(#f23f37, #e7180f);
border-color: transparent;
}
/* The arrow indicating a submenu */
#cssmenu > ul .has-sub > a::after {
content: "";
position: absolute;
top: 16px;
right: 10px;
width: 0px;
height: 0px;
/* Creating the arrow using borders */
border: 4px solid transparent;
border-left: 4px solid #e4433c;
}
/* The same arrow, but with a darker color, to create the shadow effect */
#cssmenu > ul .has-sub > a::before {
content: "";
position: absolute;
top: 17px;
right: 10px;
width: 0px;
height: 0px;
/* Creating the arrow using borders */
border: 4px solid transparent;
border-left: 4px solid #fff;
}
/* Changing the color of the arrow on hover */
#cssmenu > ul li > a:hover::after,
#cssmenu > ul li:hover > a::after {
border-left: 4px solid #fff;
}
#cssmenu > ul li > a:hover::before,
#cssmenu > ul li:hover > a::before {
border-left: 4px solid rgba(0, 0, 0, 0.25);
}
/* THE SUBMENUS */
#cssmenu > ul ul {
position: absolute;
left: 100%;
top: -9999px;
padding-left: 5px;
opacity: 0;
width: 150px;
/* The fade effect, created using an opacity transition */
-webkit-transition: opacity 0.3s ease-in;
-moz-transition: opacity 0.3s ease-in;
transition: opacity 0.3s ease-in;
}
#cssmenu > ul ul li a {
font-size: 12px;
}
/* Showing the submenu when the user is hovering the parent link */
#cssmenu > ul li:hover > ul {
top: 0px;
opacity: 1;
z-index: 1;
}
.footer{
margin-top:100px;
background-color:black;
height:38px;
width:925px;
text-align:center;
}
.footer a{
text-decoration:none;
font:bold 16px arial;
color:white;
line-height: 40px;
text-align:center;
}