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characters

返回值:Array<Element(s)>:only-child

V1.1.4概述

如果某個元素是父元素中唯一的子元素，那將會被匹配

如果父元素中含有其他元素，那將不會被匹配。

示例

描述:

在 ul 中查找是唯一子元素的 li

HTML 代碼:
<ul>
  <li>John</li>
  <li>Karl</li>
  <li>Brandon</li>
</ul>
<ul>
  <li>Glen</li>
</ul>
jQuery 代碼:
$("ul li:only-child")
結(jié)果:
[ <li>Glen</li> ]
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