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:nth-last-of-type(n|even|odd|formula)
V1.9概述
选择的所有他们的父级元素的第n个子元素，计数从最后一个元素到第一个。
因为jQuery的实现:nth-是严格来自CSS规范，n值是“1-indexed”，也就是说，从1开始计数。 对于所有其他选择器表达式比如:eq() 或 :even ，jQuery遵循JavaScript的“0索引”的计数。因此，给定一个单一<ul>包含3个<li>，$('li:nth-last-of-type(1)')选择第3个，也就是最后一个<li>。
这个不寻常的用法，可进一步讨论中找到 W3C CSS specification.
参数
nV1.9
匹配子元素序号
必须为整数，注意从1开始而不是0
evenV1.9
匹配所有偶数元素
oddV1.9
匹配所有奇数元素
formulaV1.9
使用特殊公式如(an + b)进行选择. 例如:nth-last-of-type(3n+2) 从倒数第二个具备此标签元素开始，匹配每个3的倍数的元素
示例
在每个匹配的ul中查找倒数第二个li
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
</ul>
$("ul li:nth-last-of-type(2)");