### 返回值:Array<Element(s)>:only-child
### *V1.1.4*概述
如果某个元素是父元素中唯一的子元素，那将会被匹配
如果父元素中含有其他元素，那将不会被匹配。
### 示例
#### 描述:
在 ul 中查找是唯一子元素的 li
##### HTML 代码:
~~~
<ul>
<li>John</li>
<li>Karl</li>
<li>Brandon</li>
</ul>
<ul>
<li>Glen</li>
</ul>
~~~
##### jQuery 代码:
~~~
$("ul li:only-child")
~~~
##### 结果:
~~~
[ <li>Glen</li> ]
~~~
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