为什么 nth-of-type/nth-child 不适用于嵌套元素？答案

【问题标题】：Why doesn't nth-of-type/nth-child work on nested elements?为什么 nth-of-type/nth-child 不适用于嵌套元素？
【发布时间】：2012-11-21 14:22:40
【问题描述】：

我正在尝试更改 div 中奇数 div 的样式。出于某种原因，nth-of-type(odd) 在另一个 div 中时会影响我的所有 div。这是我的常规 div 和奇数 div 的代码：

.video-entry-summary {
  width: 214px;
  height: 210px;
  margin-left: 10px;
  float: left;
  position: relative;
  overflow: hidden;
  border: 1px solid black;
}

.video-entry-summary:nth-of-type(odd) {
  width: 214px;
  height: 210px;
  margin-left: 0px;
  float: left;
  position: relative;
  overflow: hidden;
  border: 1px solid black;
  background: #ccc;
}

<div id="post-501" class="post-501 post type-post status-publish format-standard hentry category-moto-dz-films tag-news-sub-2">
  <div class="video-entry-summary">
    video 1
  </div>
</div>

<div id="post-240" class="post-240 post type-post status-publish format-standard hentry category-videos">
  <div class="video-entry-summary">
    video 2
  </div>
</div>

<div id="post-232" class="post-232 post type-post status-publish format-standard hentry category-videos">
  <div class="video-entry-summary">
    video 3
  </div>
</div>

<div id="post-223" class="post-223 post type-post status-publish format-standard hentry category-videos">
  <div class="video-entry-summary">
    video 4
  </div>
</div>

由于某种原因，nth-of-type 在包裹在我的 div 中时不起作用，但在它们未包裹在任何 div 中时确实起作用。

未包裹在 div 中时的工作版本：

.video-entry-summary {
  width: 214px;
  height: 210px;
  margin-left: 10px;
  float: left;
  position: relative;
  overflow: hidden;
  border: 1px solid black;
}

.video-entry-summary:nth-of-type(odd) {
  width: 214px;
  height: 210px;
  margin-left: 0px;
  float: left;
  position: relative;
  overflow: hidden;
  border: 1px solid black;
  background: #ccc;
}

<div class="video-entry-summary">
  video 1
</div>

<div class="video-entry-summary">
  video 2
</div>

<div class="video-entry-summary">
  video 3
</div>

<div class="video-entry-summary">
  video 4
</div>

如何让初始代码和上面的一样工作？

【问题讨论】：

标签： html css css-selectors pseudo-class

【解决方案1】：

:nth-of-type() 与:nth-child() 相似，因为它们都必须来自同一个父级。如果您需要那些包装器divs，请在这些包装器上使用:nth-of-type()：

div.post:nth-of-type(odd) .video-entry-summary {
    width:214px; 
    height:210px; 
    margin-left:0px;
    float:left;
    position:relative; 
    overflow:hidden; 
    border:1px solid black; 
    background:#ccc; 
}

如果所有兄弟姐妹都是.post，请改用:nth-child()，以防止与what :nth-of-type() really means混淆：

.post:nth-child(odd) .video-entry-summary {
    width:214px; 
    height:210px; 
    margin-left:0px;
    float:left;
    position:relative; 
    overflow:hidden; 
    border:1px solid black; 
    background:#ccc; 
}

.video-entry-summary {
  width: 214px;
  height: 210px;
  margin-left: 10px;
  float: left;
  position: relative;
  overflow: hidden;
  border: 1px solid black;
}

.post:nth-child(odd) .video-entry-summary {
  width: 214px;
  height: 210px;
  margin-left: 0px;
  float: left;
  position: relative;
  overflow: hidden;
  border: 1px solid black;
  background: #ccc;
}

<div id="post-501" class="post-501 post type-post status-publish format-standard hentry category-moto-dz-films tag-news-sub-2">
  <div class="video-entry-summary">
    video 1
  </div>
</div>

<div id="post-240" class="post-240 post type-post status-publish format-standard hentry category-videos">
  <div class="video-entry-summary">
    video 2
  </div>
</div>

<div id="post-232" class="post-232 post type-post status-publish format-standard hentry category-videos">
  <div class="video-entry-summary">
    video 3
  </div>
</div>

<div id="post-223" class="post-223 post type-post status-publish format-standard hentry category-videos">
  <div class="video-entry-summary">
    video 4
  </div>
</div>

【讨论】：