我希望ul ul子菜单能够将鼠标悬停在每个链接上;不仅仅是列表中的第一个链接。我不确定问题出在哪里（即我的编码或缺少关键代码）。
HTML代码：
<div align="left"> <div align="left"> <div align="left"><div class="menu-main-menu-container"><ul id="menu-main-menu" class="menu"><li id="menu-item-825" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-825"><a href="#">About Us</a>
<ul class="sub-menu">
<li id="menu-item-397" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-397"><a href="http://www.itstelecom.com/NewSite/index.php/about-us/corporate-overview/">Corporate Overview</a></li>
<li id="menu-item-396" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-396"><a href="http://www.itstelecom.com/NewSite/index.php/about-us/customer-testimonial/">Customer Testimonial</a></li>
<li id="menu-item-395" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-395"><a href="http://www.itstelecom.com/NewSite/index.php/about-us/press-room/">Press Room</a></li>
</ul>
</li>
<li id="menu-item-826" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-826"><a href="#">Products & Services</a>
<ul class="sub-menu">
<li id="menu-item-658" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-658"><a href="http://www.itstelecom.com/NewSite/index.php/products-services/voice/">Voice</a>
<ul class="sub-menu">
<li id="menu-item-2230" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-2230"><a href="http://#">VoIP</a></li>
<li id="menu-item-2231" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-2231"><a href="http://#">Traditional Voice</a></li>
<li id="menu-item-2232" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-2232"><a href="http://#">Other Services</a></li>
<li id="menu-item-2233" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-2233"><a href="http://#">Mobile App</a></li>
</ul>
</li>
<li id="menu-item-646" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-646"><a href="http://www.itstelecom.com/NewSite/index.php/products-services/data/">Data</a>
<ul class="sub-menu">
<li id="menu-item-2235" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-2235"><a href="http://#">Test</a></li>
<li id="menu-item-2236" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-2236"><a href="http://#">Test</a></li>
<li id="menu-item-2237" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-2237"><a href="http://#" style="
display: block;
">Test</a></li>
</ul>
</li>
<li id="menu-item-656" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-656"><a href="http://www.itstelecom.com/NewSite/index.php/products-services/computers-servers-network-services/">Computers, Servers, & Network Services</a></li>
<li id="menu-item-655" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-655"><a href="http://www.itstelecom.com/NewSite/index.php/products-services/equipment-infrastructure/">Equipment & Infrastructure</a></li>
<li id="menu-item-654" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-654"><a href="http://www.itstelecom.com/NewSite/index.php/products-services/other-services/">Other Services</a></li>
</ul>
</li>
<li id="menu-item-827" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-827"><a href="#">Clients</a>
<ul class="sub-menu">
<li id="menu-item-486" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-486"><a href="http://www.itstelecom.com/NewSite/index.php/clients/client-center/">Client Center</a></li>
<li id="menu-item-489" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-489"><a href="http://www.itstelecom.com/NewSite/index.php/clients/terms-of-service/">Terms of Service</a></li>
<li id="menu-item-634" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-634"><a href="http://www.itstelecom.com/NewSite/index.php/clients/faqs/">FAQs</a></li>
<li id="menu-item-603" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-603"><a href="http://www.itstelecom.com/NewSite/index.php/clients/referral-program/">Referral Program</a></li>
</ul>
</li>
<li id="menu-item-828" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-828"><a href="#">Channel Partners</a>
<ul class="sub-menu">
<li id="menu-item-632" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-632"><a href="http://www.itstelecom.com/NewSite/index.php/clients/program-overview/">Program Overview</a></li>
<li id="menu-item-412" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-412"><a href="http://www.itstelecom.com/NewSite/index.php/channel-partners/current-channel-partners/">Current Channel Partners</a></li>
<li id="menu-item-401" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-401"><a href="http://www.itstelecom.com/NewSite/index.php/channel-partners/partnerships/">Vendor Partnerships</a></li>
<li id="menu-item-404" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-404"><a href="http://www.itstelecom.com/NewSite/index.php/channel-partners/becoming-a-channel-partner/">Become a Channel Partner</a></li>
</ul>
</li>
<li id="menu-item-829" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-829"><a href="#">Community</a>
<ul class="sub-menu">
<li id="menu-item-499" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-499"><a href="http://www.itstelecom.com/NewSite/index.php/community/blog/">Blog</a></li>
<li id="menu-item-502" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-502"><a href="http://www.itstelecom.com/NewSite/index.php/community/newsletter-archive/">Newsletter Archive</a></li>
<li id="menu-item-508" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-508"><a href="http://www.itstelecom.com/NewSite/index.php/community/hot-tip-archive/">Hot Tip Archive</a></li>
</ul>
</li>
</ul></div>?</div></div></div>
CSS代码：
.menu,
.menu ul,
.menu li,
.menu a {
margin: 0;
padding: 0;
border: none;
outline: none;
z-index: 1000;
}
/* Menu */
.menu {
position: relative;
height: 40px;
width: 555px;
background: #1b3563;
background: -webkit-linear-gradient(top, #1b3563 0%,#2c2d33 100%);
background: -moz-linear-gradient(top, #1b3563 0%,#2c2d33 100%);
background: -o-linear-gradient(top, #1b3563 0%,#2c2d33 100%);
background: -ms-linear-gradient(top, #1b3563 0%,#2c2d33 100%);
background: linear-gradient(top, #1b3563 0%,#2c2d33 100%);
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
}
.menu li {
position: relative;
list-style: none;
float: left;
display: block;
height: 40px;
}
/* Links */
.menu li a {
display: block;
padding: 0 14px;
margin: 6px 0;
line-height: 28px;
text-decoration: none;
border-left: 1px solid #393942; /* Dashs between links color*/
border-right: 1px solid #4f5058; /* Dashs between links color*/
font-family: Helvetica, Arial, sans-serif;
font-weight: bold;
font-size: 13px;
color: #f3f3f3;/* Main text color */
text-shadow: 1px 1px 1px rgba(0,0,0,.6);
-webkit-transition: color .2s ease-in-out;
-moz-transition: color .2s ease-in-out;
-o-transition: color .2s ease-in-out;
-ms-transition: color .2s ease-in-out;
transition: color .2s ease-in-out;
}
.menu li:first-child a { border-left: none; }
.menu li:last-child a{ border-right: none; }
.menu li:hover > a { color: #acb8bf; }
/* Sub Menu */
.menu ul {
position: absolute;
top:100%;
left: 0;
border-bottom-color:#000000;
opacity: 0;
background: #1b3563;
background: -webkit-linear-gradient(top, #1b3563 0%,#2c2d33 100%);
background: -moz-linear-gradient(top, #1b3563 0%,#2c2d33 100%);
background: -o-linear-gradient(top, #1b3563 0%,#2c2d33 100%);
background: -ms-linear-gradient(top, #1b3563 0%,#2c2d33 100%);
background: linear-gradient(top, #1b3563 0%,#2c2d33 100%);
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
-webkit-transition: opacity .25s ease .1s;
-moz-transition: opacity .25s ease .1s;
-o-transition: opacity .25s ease .1s;
-ms-transition: opacity .25s ease .1s;
transition: opacity .25s ease .1s;
}
.menu li:hover > ul { opacity: 1; }
.menu ul li {
height: 0;
overflow: hidden;
padding: 0;
-webkit-transition: height .25s ease .1s;
-moz-transition: height .25s ease .1s;
-o-transition: height .25s ease .1s;
-ms-transition: height .25s ease .1s;
transition: height .25s ease .1s;
}
.menu li:hover > ul li {
float:right;
height: auto;
overflow: visible;
padding: 0;
}
.menu ul li a {
width: 150px;
margin: 0;
border: none;
border-bottom: 1px solid #353539;
}
.menu ul li:last-child a { border: none; }
#menu-main-menu .sub-menu .sub-menu > ul {
display: block;
}
#menu-main-menu .sub-menu .sub-menu ul {
display: none;
position: absolute;
left: 100%;
top: 0;
}
#menu-main-menu .sub-menu .sub-menu ul li a {
background: #528009;
border-bottom: 1px dotted #97b36b;
}
#menu-main-menu .sub-menu .sub-menu ul li a:hover {
background: #345105;
}
.menu ul ul {
box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
-moz-box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
-webkit-box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
position: absolute;
top: 0px;
left: 100%;
width: 180px;
z-index: 99999;
}
.menu ul ul a:hover {
display:block; !important
}?
答案 0 :(得分：0)
基本上，使用opacity显示/隐藏嵌套列表的方法是问题的根源。第二个列表与第一个列表重叠，因为它们具有相同的z-index值，即使它不可见。
您需要在悬停时添加样式以重新设置z-index值，这样只有当前悬停列表位于顶部，或者通过定位移动隐藏列表，使嵌套菜单系统更易于管理，因此他们不会妨碍他们。