jquery - 在导航上应用 CSS 时仅显示第一项

Question

我尝试了以下导航代码，我在其中从 mysql 数据库表中检索类别名称和子类别。问题是当我不对其应用 css 时。它显示了其相关类别下的所有子类别。但是当我将一些 css 应用到此代码时，它只显示悬停在类别名称上的第一个相关子类别名称。这是我的代码和CSS。我被困住了，不明白我哪里做错了。请提出任何建议。

$(function() {
  if ($.browser.msie && $.browser.version.substr(0,1)<7)
  {
    $('li').has('ul').mouseover(function(){
      $(this).children('ul').show();
    }).mouseout(function(){
      $(this).children('ul').hide();
    })
  }
});

body
{
  width: 960px;
  margin: 40px auto;
}

/* Main menu */

#menu
{
  width: 100%;
  margin: 0;
  padding: 10px 0 0 0;
  list-style: none;
  background: #111;
  background: -moz-linear-gradient(#444, #111);
  background: -webkit-gradient(linear,left bottom,left top,color-stop(0, #111),color-stop(1, #444));
  background: -webkit-linear-gradient(#444, #111);
  background: -o-linear-gradient(#444, #111);
  background: -ms-linear-gradient(#444, #111);
  background: linear-gradient(#444, #111);
  -moz-border-radius: 50px;
  border-radius: 50px;
  -moz-box-shadow: 0 2px 1px #9c9c9c;
  -webkit-box-shadow: 0 2px 1px #9c9c9c;
  box-shadow: 0 2px 1px #9c9c9c;
}

#menu li
{
  float: left;
  padding: 0 0 10px 0;
  position: relative;
  line-height: 0;
}

#menu a
{
  float: left;
  height: 25px;
  padding: 0 25px;
  color: #999;
  text-transform: uppercase;
  font: bold 12px/25px Arial, Helvetica;
  text-decoration: none;
  text-shadow: 0 1px 0 #000;
}

#menu li:hover > a
{
  color: #fafafa;
}

*html #menu li a:hover /* IE6 */
{
  color: #fafafa;
}

#menu li:hover > ul
{
  display: block;
}

/* Sub-menu */

#menu ul
{
  list-style: none;
  margin: 0;
  padding: 0;
  display: none;
  position: absolute;
  top: 35px;
  left: 0;
  z-index: 99999;
  background: #444;
  background: -moz-linear-gradient(#444, #111);
  background: -webkit-gradient(linear,left bottom,left top,color-stop(0, #111),color-stop(1, #444));
  background: -webkit-linear-gradient(#444, #111);
  background: -o-linear-gradient(#444, #111);
  background: -ms-linear-gradient(#444, #111);
  background: linear-gradient(#444, #111);
  -moz-box-shadow: 0 0 2px rgba(255,255,255,.5);
  -webkit-box-shadow: 0 0 2px rgba(255,255,255,.5);
  box-shadow: 0 0 2px rgba(255,255,255,.5);
  -moz-border-radius: 5px;
  border-radius: 5px;
}

#menu ul ul
{
  top: 0;
  left: 150px;
}

#menu ul li
{
  float: none;
  margin: 0;
  padding: 0;
  display: block;
  -moz-box-shadow: 0 1px 0 #111111, 0 2px 0 #777777;
  -webkit-box-shadow: 0 1px 0 #111111, 0 2px 0 #777777;
  box-shadow: 0 1px 0 #111111, 0 2px 0 #777777;
}

#menu ul li:last-child
{
  -moz-box-shadow: none;
  -webkit-box-shadow: none;
  box-shadow: none;
}

#menu ul a
{
  padding: 10px;
  height: 10px;
  width: 130px;
  height: auto;
  line-height: 1;
  display: block;
  white-space: nowrap;
  float: none;
  text-transform: none;
}

*html #menu ul a /* IE6 */
{
  height: 10px;
}

*:first-child+html #menu ul a /* IE7 */
{
  height: 10px;
}

#menu ul a:hover
{
  background: #0186ba;
  background: -moz-linear-gradient(#04acec,  #0186ba);
  background: -webkit-gradient(linear, left top, left bottom, from(#04acec), to(#0186ba));
  background: -webkit-linear-gradient(#04acec,  #0186ba);
  background: -o-linear-gradient(#04acec,  #0186ba);
  background: -ms-linear-gradient(#04acec,  #0186ba);
  background: linear-gradient(#04acec,  #0186ba);
}

#menu ul li:first-child > a
{
  -moz-border-radius: 5px 5px 0 0;
  border-radius: 5px 5px 0 0;
}

#menu ul li:first-child > a:after
{
  content: '';
  position: absolute;
  left: 30px;
  top: -8px;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 8px solid #444;
}

#menu ul ul li:first-child a:after
{
  left: -8px;
  top: 12px;
  width: 0;
  height: 0;
  border-left: 0;
  border-bottom: 5px solid transparent;
  border-top: 5px solid transparent;
  border-right: 8px solid #444;
}

#menu ul li:first-child a:hover:after
{
  border-bottom-color: #04acec;
}

#menu ul ul li:first-child a:hover:after
{
  border-right-color: #04acec;
  border-bottom-color: transparent;
}


#menu ul li:last-child > a
{
  -moz-border-radius: 0 0 5px 5px;
  border-radius: 0 0 5px 5px;
}

/* Clear floated elements */
#menu:after
{
  visibility: hidden;
  display: block;
  font-size: 0;
  content: " ";
  clear: both;
  height: 0;
}

* html #menu             { zoom: 1; } /* IE6 */
*:first-child+html #menu { zoom: 1; } /* IE7 */

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul id="menu">

  <li>
    <a href="#">Categories</a>
    <ul>
      <li>
        <a href="#">CSS</a>
        <ul>
          <li><a href="#">Item 11</a></li>
          <li><a href="#">Item 12</a></li>
          <li><a href="#">Item 13</a></li>
          <li><a href="#">Item 14</a></li>
        </ul>				
      </li>
      <li>
        <a href="#">Graphic design</a>
        <ul>
          <li><a href="#">Item 21</a></li>
          <li><a href="#">Item 22</a></li>
          <li><a href="#">Item 23</a></li>
          <li><a href="#">Item 24</a></li>
        </ul>				
      </li>
      <li>
        <a href="#">Development tools</a>
        <ul>
          <li><a href="#">Item 31</a></li>
          <li><a href="#">Item 32</a></li>
          <li><a href="#">Item 33</a></li>
          <li><a href="#">Item 34</a></li>
        </ul>				
      </li>
      <li>
        <a href="#">Web design</a>				
        <ul>
          <li><a href="#">Item 41</a></li>
          <li><a href="#">Item 42</a></li>
          <li><a href="#">Item 43</a></li>
          <li><a href="#">Item 44</a></li>
        </ul>	
      </li>
    </ul>
  </li>
</ul>

https://jsfiddle.net/w6jpxtc9/1/

Answer 1

查看您发布的第一个版本的代码，我认为您的问题可能出在这里:

<ul>
    <a href="#"><?=$ro['s_cat_name']?></a>
</ul>

似乎缺少一个 <li> .另外，你的二级<li>在子类别循环内关闭；我猜它应该在外面。