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文字

语法:

E:nth-last-child(n) { sRules }

说明:

匹配父元素的倒数第n个子元素E,假设该子元素不是E,则选择符无效。
  • 要使该属性生效,E元素必须是某个元素的子元素,E的父元素最高是body,即E可以是body的子元素

  • 该选择符允许使用一个乘法因子(n)来作为换算方式,比如我们想选中倒数第一个子元素E,那么选择符可以写成:E:nth-last-child(1)

  • 有一点需要注意的是:

    HTML示例代码:

    <div> <p>第1个p</p> <p>第2个p</p> <span>第1个span</span> <p>第3个p</p> <span>第2个span</span> </div>

    如上HTML,假设要命中倒数第一个p(即正数第3个p),那么CSS选择符应该是:

    p:nth-last-child(2){color:#f00;}

    而不是:

    p:nth-last-child(1){color:#f00;}

    因为倒数第1个p,其实是倒数第2个子元素。基于选择符从右到左解析,首先要找到第1个子元素,然后再去检查该子元素是否为p,如果不是p,则n递增,继续查找

    假设不确定倒数第1个子元素是否为E,但是又想命中倒数第1个E,应该这样写:

    p:last-of-type{color:#f00;}

    或者这样写:

    p:nth-last-of-type(1){color:#f00;}

    参考 E:last-of-type 和 E:nth-last-of-type(n)

兼容性:

IEFirefoxChromeSafariOperaiOS SafariAndroid BrowserAndroid Chrome
6.0-8.02.0+4.0+3.1+3.5+3.2+2.1+18.0+
IE9.0+

示例:

实例

<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
<meta charset="utf-8" />
<title>结构性伪类选择符 E:nth-last-child(n)_CSS参考手册_web前端开发参考手册系列</title>
<meta name="author" content="Joy Du(飘零雾雨), dooyoe@gmail.com, www.doyoe.com" />
<style>
h1 {
	font-size: 16px;
}
li:nth-last-child(1) {
	color: #f00;
}
</style>
</head>
<body>
<h1>最后一行要变成红色 <code>li:nth-last-child(1){color:#f00;}</code></h1>
<ul>
	<li>结构性伪类选择符 E:nth-last-child(n)</li>
	<li>结构性伪类选择符 E:nth-last-child(n)</li>
	<li>结构性伪类选择符 E:nth-last-child(n)</li>
</ul>
</body>
</html>
			

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