Css ul ul 子菜单不悬停在每个链接上

Question

我希望ul ul子菜单能够将鼠标悬停在每个链接上;而不仅仅是列表中的第一个链接。我不确定问题出在哪里（即使用我的编码或缺少关键代码）。

网页代码：

        <div align="left">&nbsp;<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 &amp; 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, &amp; 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 &amp; 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
    }?

Jfiddle - 示例

Answer 1

基本上，您显示/隐藏带有opacity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计z-index值，以便只有当前悬停列表位于顶部，或者通过定位将隐藏列表移开来使嵌套菜单系统更易于管理，这样它们就不会妨碍。