html – 如何在嵌套列表样式中分隔样式？

我有一个列表,列表中也有列表.
我在父列表上设置样式,但我想要父母和子列表的不同样式,但它们混合在一起我不能分开它们.

HTML文件：

<ul id="accountNavigation">
  <li><a href="#">Something</a></li>                    
  <li id="userNavigation">
    <img src="https://si0.twimg.com/profile_images/135460415/UAB_dragon_head_normal.png" alt=""/>
    <a href="#">Username</a>
    <div class="showme">
      <ul id="userNavigationSubMenu">
        <li>test</li>
        <li>test</li>
        <li>test</li>
        <li>test</li>
        <li>test</li>
        <li>test</li>
        <li>test</li>

      </ul>
    </div>
  </li>
</ul>

CSS文件：

body{background:#ff0000;}
#accountNavigation{ list-style: none;float: right;height: 44px;}
#accountNavigation li{ float: left;color: #fff;height: 44px;}
#accountNavigation li:hover{ background: #ddd;cursor: pointer;}
#accountNavigation li a{ text-decoration: none;color: #fff;line-height: 44px;font-weight: bold;font-size: 13px;height: 44px;padding: 15px 27px 0 14px;outline: none;}
#accountNavigation li img{ position: absolute;top: 12px;left: 10px;width: 22px;height: 22px;}
#userNavigation{position: relative;}
#userNavigation a {padding-left: 38px !important;}

#userNavigation{}
#userNavigation:hover{}
#userNavigation:hover .showme{display: inline;}
.showme
{
  display: none;
  width: 140px;
  height: 200px;
  background: #f5f5f5;
  margin: 0px auto;
  padding: 10px 5px 0px 5px;
  border: 1px solid #ddd;
  border-top: none;
  z-index: 10;
  position: absolute;
  right:0;
  top: auto;

}
#userNavigation ul { list-style: none;}

这是fiddle.

解决方法

只需使用>直接/直接后代组合子,以及用于指定您要定位的li(或ul)元素的ID：

#accountNavigation { /* outer ul element */
}

#accountNavigation > li { /* outer ul element's children li */
}

#accountNavigation > li > ul { /* first 'inner' ul element */
}

#accountNavigation > li > ul > li { /* first 'inner' ul element's li children */
}

当然,您可以更通用,只需使用：

ul { /* targets all ul elements */
    /* general styles */
}
ul li { /* targets all li elements within a ul */
    /* general styles */
}
ul li ul { /* targets all ul elements within an li element,itself within a ul */
    /* overrule general 'outer' styles */
}
ul li ul li { /* targets all li elements within a ul element,within an li element,itself within a ul...and so on */
    /* overrule general 'outer' styles */
}

使用一般方法：

<ul>
    <li>This should be green!</li>
    <li>This is also green...
        <ul>
            <li>But this is not,it's,um...blue!</li>
            <li>And so on...</li>
        </ul></li>
    <li>This is green too,just because.</li>
</ul>

以下CSS应证明其用途：

ul li {
    color: green; /* the 'general'/'default' settings */
    margin-left: 10%;
}

ul li ul li {
    color: blue; /* this overrides the 'general' color setting */
                 /* the margin is not overridden however */
}​

JS Fiddle demo.

参考文献：

> CSS Selectors (Level 3),at the W3.org.

原文地址：https://www.jb51.cc/html/226504.html