我的 css 下拉菜单不显示子菜单

Question

当我将鼠标悬停在选项卡上时，子菜单没有显示，几天来我一直在努力寻找修复方法。我已经研究语法一段时间了，我觉得我需要一双新眼睛。请尽快帮忙

<header id="header" class="HeaderStyle" style="padding-bottom: 0px; padding-top: 0px;">
<p style="font-size: xx-large; width: 400px;margin-top: 0px;margin-bottom: 0px;margin-right: 0%;"> Sherwood Lego League</p>
<form method="get" action="http://www.google.com/search" style="text-align:right; width: 99%;">
    <input type="text" name="q" size="25" maxlength="255" value="" placeholder="Search">
    <input type="submit" value="Search">
    <input type="hidden" name="sitesearch" value="www.SherwoodLegoLeague.com">
</form>
<navigation id="NavigationLink" class="navigationStyle">
    <section class="menu">
        <ul>
            <li><a class="left_nosub" href="home.html">Home</a></li>
            <li><a class="center_hassub" href="teams/teams.html">Teams</a>
                <ul>
                    <li><a href="teams/team1.html">Team 1</a></li>
                    <li><a href="teams/team2.html">Team 2</a></li>
                    <li><a href="teams/team3.html">Team 3</a></li>
                    <li><a href="teams/team4.html">Team 4</a></li>
                    <li><a href="teams/team5.html">Team 5</a></li>
                </ul>
            </li>
            <li><a class="center_hassub" href="news/news.html">News</a>
                <ul>
                    <li><a href="news/article.html">Articles</a></li>
                    <li><a href="news/timeline.html">Timeline</a></li>
                </ul>
            </li>
            <li><a class="right_nosub" href="contactUs.html">Contact Us</a></li>
        </ul>
    </section>
</navigation>
</header>

CSS节

.menu {
   font-family: "TimesNewRoman", Times, serif;
   position: relative;
   font-size: 11px;
   margin: 0;
   z-index: 1000;
}
.menu ul li a {
    display: block;
    text-decoration: none;
    color: #f0f0f0;
    font-weight: bold;
    width: 81px;
    height: 42px;
    text-align: center;
    border-bottom: 0;
    background-image: url('../images/MenuPieces/center.png');
    line-height: 48px;
    font-size: 11px;
    overflow: hidden;
    padding-left: 1px;
}
.menu .left_nosub {
    background-image: url('../images/MenuPieces/left.png');
    padding-left: 1px;
    margin-right: -1px;
}
.menu .right_nosub {
    background-image: url('../images/MenuPieces/right.png');
}
.menu ul {
    padding: 0;
    margin: 0;
    list-style: none;
}
.menu ul li {
    float: left;
    position: relative;
}
.menu ul li ul {
    display: none;
}
.menu ul li:hover a {
    color: #000;
    background: url('../images/MenuPieces/center_hassub.png');
}
.menu ul li:hover ul li a.center_hassub {
    background: #6a3;
    color: #000;
}
.menu ul li:hover ul li:hover a.center_hassub {
    background: #6fc;
    color: #000;
}
.menu ul li:hover ul li ul {
    display: none;
}
.menu ul li:hover .left_nosub {
    color: #000;
    background: url('../images/MenuPieces/left_nosub.png');
}
.menu ul li:hover .right_hassub {
    color: #000;
    background: url('../images/MenuPieces/right_hassub.png');
}
.menu ul li:hover .right_nosub {
    color: #000;
    background: url('../images/MenuPieces/right_nosub.png');
}
.menu ul li:hover ul li a {
    background-image: none;
    display: block;
    height: 28px;
    line-height: 26px;
    color: #000;
    width: 142px;
    text-align: left;
    margin: 0;
    padding: 0 0 0 11px;
    font-weight: normal;
}
.menu ul li:hover ul {
    margin: 0 0 0 3px;
    padding: 0;
    background-image: url('../images/MenuPieces/dropdown.png');
    background-repeat: no-repeat;
    background-position: bottom left;
}
.menu  ul li:hover ul li a:hover {
    color: #000 !important;
    background-image: url('../images/MenuPieces/sub_hover.png');
}
.menu ul li:hover ul li:hover ul {
    display: block;
    position: absolute;
    left: 105px;
    top: 0;
}
.menu ul li:hover ul li:hover ul.left {
    left: -105px;
}
.menu ul li:hover ul .sub_active {
    background-image: url('../images/MenuPieces/sub_active.png');
    margin-right: 1px;
}

Answer 1

您默认隐藏了它们，但您忘记在悬停时向它们添加显示属性。您需要向 .menu ul li:hover ul li a:hover 和 .menu ul li:hover ul 选择器添加类似 display: block; 或 display: inline-block; 或类似属性的内容。

JSFiddle

Answer 2

ul li:hover ul { 
display:block;
}

有这样的东西，当你悬停在ul li上时，你会显示ul。

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