为什么nth-of / nth-child不对嵌套元素起作用？

Question

我正在尝试更改div内奇数div的样式。由于某种原因，nth-of-type(odd)当它位于另一个div内时，它会影响我的所有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>

出于某种原因，nth-of-type当将其包裹在我的div中时不起作用，但是当它们不包裹在任何div中时却起作用。

.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>

``如何使初始代码与上述代码相同？