如果您可以将鼠标悬停在菜单中的 MORE 按钮上： http://jsfiddle.net/H8FVE/3/ 你会注意到下面的大图（#featured）覆盖了下拉div。为什么以及如何解决？
以下是我的HTML代码的一部分：
<div id="second-menu" class="clearfix">
<ul id="secondary-menu" class="nav sf-js-enabled">
<li class="manimation"><a href="" style="width:400px;border-bottom:9px solid #43cf61">Animation</a></li>
</ul>
<ul id="mega">
<li class="dif mmore" style="background:none;"><a href="#" style="font-style:italic;border-bottom:9px solid #4b5571">More...</a>
<div>
<ticman>
<ul>
<li class="mgames"><a href="" style="border-bottom:9px solid #e34328">Games</a></li>
<li class="mliterature"><a href="" style="border-bottom:9px solid #2c8f83">Literature</a></li>
<li class="marts"><a href="" style="border-bottom:9px solid #cc226a">Arts</a></li>
<li class="mcontact" style="background:none;"><a href="" style="border-bottom:9px solid #9395aa">Contact</a></li>
</ul>
</ticman>
<h2>Classes</h2>
<p><a href="#">Times</a><a href="#">Schedual</a><a href="#">Map</a></p>
<p><a href="#">Names</a><a href="#">Study</a><a href="#">Directions</a></p>
<p><a href="#">Health</a><a href="#">Dance</a><a href="#">Biology</a></p>
<h2>Teachers</h2>
<p><a href="#">Billy</a><a href="#">Madeleine</a><a href="#">Lauren</a><a href="#">Steve</a></p>
<p><a href="#">Paddington</a><a href="#">Stefan</a><a href="#">Michael</a><a href="#">Madeline</a></p>
<p><a href="#">Shannon</a><a href="#">Mary</a><a href="#">Raffaello</a><a href="#">Lorence R</a></p>
<h2>Location</h2>
<p><a href="#">Carlsbad</a><a href="#">Oceanside</a><a href="#">El Cajon</a></p>
<p><a href="#">Vista</a><a href="#">La Costa</a><a href="#">Encinitas</a></p>
<p><a href="#">San Diego</a><a href="#">Los Angles</a><a href="#">Cardiff</a></p>
</div>
</li>
</ul>
</div> <!-- end #second-menu -->
<div class="et_cycle" id="featured">
<a href="#" id="left-arrow">Previous</a>
<a href="#" id="right-arrow">Next</a>
<div id="slides" style="position: relative; background-image: none;">
<div class="slide" style="position: absolute; top: 0px; left: 0px; z-index: 3; opacity: 1; display: block;">
<img width="958px" height="340px" alt="10 moments in cinematic history changing faith" src="http://ftframes.com/delheat/wordpress/wp-content/uploads/et_temp/ip-man-donnie-yen-756651_958x340.jpg"> <div class="featured-top-shadow"></div>
<div class="featured-bottom-shadow"></div>
<div class="featured-description">
<div class="feat_desc">
<p class="meta-info">Posted by <a rel="author" title="Posts by admin" href="http://ftframes.com/delheat/wordpress/?author=1">admin</a> on Aug 9, 2012</p>
<h2 class="featured-title"><a href="http://ftframes.com/delheat/wordpress/?p=43">Some random text here</a></h2>
<p>Well, I like this trailer a bit better than Chasing Mavericks’. Well for one, Gerry gets to keep his Scottish brogue, wahoo! Plus, I kind of like seeing him with kids. I mean the last time he played dad to a little boy was in the wonderful indie Dear Frankie, and he’s definitely a natural with them. Then there’s the supporting cast: Catherine Zeta-Jones, Jessica Biel, Uma Thurman, Dennis Quaid and...</p>
</div>
<a class="readmore" href="http://ftframes.com/delheat/wordpress/?p=43">Read More</a>
</div> <!-- end .description -->
</div> <!-- end .slide -->
<div class="slide" style="position: absolute; top: 0px; left: 0px; display: none; z-index: 2; opacity: 0;">
<img width="958px" height="340px" alt="More experimental testings" src="http://ftframes.com/delheat/wordpress/wp-content/uploads/2012/07/vlcsnap-2012-05-13-22h37m19s79-300x129.png"> <div class="featured-top-shadow"></div>
<div class="featured-bottom-shadow"></div>
<div class="featured-description">
<div class="feat_desc">
<p class="meta-info">Posted by <a rel="author" title="Posts by admin" href="http://ftframes.com/delheat/wordpress/?author=1">admin</a> on Jul 30, 2012</p>
<h2 class="featured-title"><a href="http://ftframes.com/delheat/wordpress/?p=10">More experimental testings</a></h2>
<p>Lets see how this one turns out… Lets see how this one turLets see how this one turLets see how this one turLets see how this one turLets see how this one turLets see how this one turLets see how this one turLets see how this one tur
Lets see how this one turLets see how this one turLets see how this one turLets see how this one turLets see how this one turLets see how this one turLets see how...</p>
</div>
<a class="readmore" href="http://ftframes.com/delheat/wordpress/?p=10">Read More</a>
</div> <!-- end .description -->
</div> <!-- end .slide -->
<div class="slide" style="position: absolute; top: 0px; left: 0px; display: none; z-index: 1; opacity: 0;">
<img width="958px" height="340px" alt="Testing this theme with image" src="http://ftframes.com/delheat/wordpress/wp-content/uploads/et_temp/251932_10151043115229294_310983318_n-39277_635x340.jpg"> <div class="featured-top-shadow"></div>
<div class="featured-bottom-shadow"></div>
<div class="featured-description">
<div class="feat_desc">
<p class="meta-info">Posted by <a rel="author" title="Posts by admin" href="http://ftframes.com/delheat/wordpress/?author=1">admin</a> on Jul 30, 2012</p>
<h2 class="featured-title"><a href="http://ftframes.com/delheat/wordpress/?p=6">Testing this theme with image</a></h2>
<p>And this is how it looks, very interesting indeed.And this is how it looks, very interesting indeed.And this is how it looks, very interesting indeed.And this is how it looks, very interesting indeed.And this is how it looks, very interesting indeed.And this is how it looks, very interesting indeed.And this is how it looks, very interesting indeed.And this is how it looks, very interesting...</p>
</div>
<a class="readmore" href="http://ftframes.com/delheat/wordpress/?p=6">Read More</a>
</div> <!-- end .description -->
</div> <!-- end .slide -->
</div> <!-- end #slides -->
</div> <!-- end #featured -->
这是我的CSS的一部分：
ul#secondary-menu li { background: url(images/secondary-menu-bg.png) repeat-y top right; }
ul#secondary-menu a { font-size: 16px; color: #48423f; text-decoration: none; text-transform: uppercase; font-weight: bold; padding: 22px 16px; }
ul#secondary-menu a:hover { color: #ffffff; text-shadow: 1px 1px 0 #404747; }
#second-menu ul.nav li:hover a {color: #ffffff; text-shadow: 1px 1px 0 #404747; }
ul#secondary-menu > li.current_page_item > a { color: #919e9e !important; }
ul#secondary-menu li ul, #category_mobile_menu { width: 360px !important; padding: 7px 0 10px; background: #fff url(images/content-bg.png); top: 55px !important; -moz-box-shadow:3px 3px 7px 1px rgba(0, 0, 0, 0.1); -webkit-box-shadow: 3px 3px 7px 1px rgba(0, 0, 0, 0.1); box-shadow: 3px 3px 7px 1px rgba(0, 0, 0, 0.1); -moz-border-radius: 10px; -webkit-border-radius: 10px; border-radius: 10px; border-top-left-radius: 0px;-moz-border-radius-topleft: 0px; border-top-right-radius: 0px; -webkit-border-top-left-radius: 0px; -moz-border-radius-topright: 0px; -webkit-border-top-right-radius: 0px; z-index: 9999px; display: none; }
ul#secondary-menu ul li, #category_mobile_menu li a { margin: 0 !important; padding: 8px 0 8px 30px !important; width: 150px; float: left; }
ul#secondary-menu ul li a, #category_mobile_menu a { padding: 0 !important; }
ul#secondary-menu li:hover ul ul, ul#secondary-menu li.sfHover ul ul { top: -8px !important; left: 180px !important; -moz-border-radius: 8px; -webkit-border-radius: 8px; border-radius: 8px; }
ul#secondary-menu ul li.even-item { background: none; }
.mfilm:hover{
background:#ea2e49 !important;
}
.mtv:hover{
background:#2589cf !important;
}
.mwebvideos:hover{
background:#5c58ac !important;
}
.manimation:hover{
background:#43cf61 !important;
}
.manime:hover{
background:#c142a5 !important;
}
.mmanga:hover{
background:#e77848 !important;
}
.mcomics:hover{
background:#e8eb05 !important;
}
.mwriters:hover{
background:#ff3c75 !important;
}
.mmore:hover{
background:#4b5571 !important;
}
.mliterature:hover{
background:#2c8f83 !important;
}
.mgames:hover{
background:#e34328 !important;
}
.marts:hover{
background:#cc226a !important;
}
.mcontact:hover{
background:#9395aa !important;
}
/* ---------- Mega Drop Down --------- */
ul#mega li { padding-right: 0px; background: url(images/secondary-menu-bg.png) repeat-y top right; }
#mega {
list-style:none;
font-weight:bold;
height:2em;
}
#mega li {
padding: 23px 0px;
background:#999;
border:0px solid #000;
float:left;
text-align:center;
position:relative;
}
#mega li:hover {
background:#eee;
border-bottom:0; /* border-bottom:0; and padding-bottom:1px; keeps <li> and <div> connected */
z-index:1; /* shadow above adjacent li */
}
#mega a { font-size: 16px; color: #48423f; text-decoration: none; text-transform: uppercase; font-weight: bold; padding: 22px 16px;}
ul#mega a:hover { color: #FFFFFF; text-shadow: 1px 1px 0 #404747; }
/* ----------- Hide/Show Div ---------- */
#mega div {
-moz-border-bottom-colors: none;
-moz-border-image: none;
-moz-border-left-colors: none;
-moz-border-right-colors: none;
-moz-border-top-colors: none;
background: none repeat scroll 0 0 #FFFFFF;
border-color: -moz-use-text-color #48423F #48423F;
border-right: 1px solid #48423F;
border-style: none solid solid;
border-width: 0 1px 1px;
font-weight: normal;
left: -999em;
margin-top: 1px;
position: absolute;
text-align: left;
width: 496px;
}
/* --------- Within Div Styles --------- */
#mega li:hover div {
left: -1px;
top: auto;
}
#mega li.dif:hover div {
left: -407px;
top: 72px;
}
#mega li.mmore:hover > a {
color: #FFFFFF; text-shadow: 1px 1px 0 #404747; /* Ensures hover on MORE remains */
}
#mega div h2 {
background: none repeat scroll 0 0 #999999;
clear: both;
float: left;
font-size: 1em;
margin: 10px 0 5px;
padding: 0 10px;
position: relative;
width: 300px;
}
#mega div ticman {
clear: both;
float: left;
position: relative;
margin-left:1px;
margin-right:1px;
width: 495px;
height: 74px;
background-image: url(images/morebgwide.png);
background-size:495px 74px;
background-repeat:no-repeat;
}
#mega div p {
float: left;
padding-left: 10px;
position: relative;
width: 106px;
}
#mega div p a {
clear: left;
float: left;
line-height: 1.4;
text-decoration: underline;
width: 100%;
}
#mega div a:hover, #mega div a:focus, #mega div a:active {
text-decoration: none;
}
/*------------------------------------------------*/
/*--------------[FEATURED SLIDER]-----------------*/
/*------------------------------------------------*/
#featured { position: relative; padding-bottom: 20px; margin-left: -1px; margin-right: -1px; }
a#left-arrow, a#right-arrow { position: absolute; top: 136px; width: 32px; height: 68px; text-indent:-9999px; }
a#left-arrow { background:url(images/left-arrow.png) no-repeat; left: -32px; }
a#right-arrow { background:url(images/right-arrow.png) no-repeat; right: -32px; }
.featured-top-shadow { background:url(images/featured-top-shadow.png) repeat-x; position: absolute; top:0px; left: 0px; width: 958px; height: 7px; }
.featured-bottom-shadow { background:url(images/featured-bottom-shadow.png) repeat-x; position: absolute; bottom:0; left: 0; width: 958px; height: 8px; }
.featured-description { position: absolute; width: 333px; height: 196px; top: 40px; right:54px; background:url(images/featured-description.png); padding: 27px 32px 40px; -moz-border-radius: 10px; -webkit-border-radius: 10px; border-radius: 10px; }
.featured-description p.meta-info { font-family: Georgia, serif; font-style: italic; font-size: 12px; color: #747474; }
.featured-description p.meta-info a { text-decoration: none; color: #fff; }
h2.featured-title { font-family: 'Kreon', Arial, sans-serif; font-weight: lighter;font-size: 30px; text-shadow: 1px 1px 1px rgba(0,0,0,0.4); margin-top: -4px; }
h2.featured-title a { text-decoration: none; color: #ffffff; }
.featured-description p { color: #c9c8c8; text-shadow: 1px 1px 1px rgba(0,0,0,0.4); line-height: 19px; }
a.readmore { display: block; background: url(images/readmore.png); height: 27px; padding: 0 17px; color: #dfca81; font-size: 12px; line-height: 27px; position: absolute; bottom: 0px; right: 0px; text-shadow: none; }
#featured a.readmore { -moz-border-radius-bottomright: 10px;-webkit-border-bottom-right-radius: 10px; border-bottom-right-radius: 10px; }
#featured a.readmore:hover { color: #fff; }
虽然，我建议忽视这个问题的视觉呈现：http://jsfiddle.net/H8FVE/3/
我一直试图整天把头包裹起来，几乎让我的头发着火了。你知道怎么解决这个问题吗？
答案 0 :(得分：2)
使用z-index css属性在HTML中可视化地对象这样的对象，无论您的DOM树如何。我会建议你测试你的最终实现跨浏览器，尤其是IE7。该死的你是因为你为我们所有人做的额外工作。
答案 1 :(得分：1)
试试这个：
#mega li:hover {
background:#eee;
border-bottom:0; /* border-bottom:0; and padding-bottom:1px; keeps <li> and <div> connected */
z-index:10; /* shadow above adjacent li */
}
我将z-index更改为10而不是1。
答案 2 :(得分：1)
请参阅http://jsfiddle.net/H8FVE/6/：
添加
#second-menu{
z-index:4;position:relative;
}
那是因为slide有z-index:3，所以如果你想看second-menu，z-index必须更高。
您还必须添加position:relative，因为z-index对position:static的元素没有影响。
修改：
我见过你有
#mega div{
left:-999em;
}
#mega li.dif:hover div {
left: -407px;
top: 72px;
}
我认为这样会更好：
#mega > li.dif > div{
display:none:
left: -407px;
top: 72px;
}
#mega > li.dif:hover > div {
display: block;
}
那是因为如果你将left:-999em;设置为#mega div，你会认为它不会显示，因为-999em很多。但是如果你想隐藏它，不是最好不要显示它吗？
我添加了子选择器（>），因为将来可能会修改它并在#mega > li.dif > div内添加更多div;和子选择器应该比后代选择器更快。
答案 3 :(得分：0)
给＃second-menu一个z-index为3
给“#mega div”一个z-index为2
给#featured一个z指数1