在多个父项中选择第n个子项 [英] Select nth-child across multiple parents

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问题描述

我有以下标记:

<div class="foo">
    <ul>
        <li>one</li>
        <li>two</li>
    </ul>
    <ul>
        <li>three</li>
    </ul>
    <ul>
        <li>four</li>
    </ul>
</div>

我想打造one和three。

I wish to style "one" and "three".

但是,标记也可以是:

<div class="foo">
    <ul>
        <li>one</li>
        <li>two</li>
        <li>three</li>
    </ul>
    <ul>
        <li>four</li>
    </ul>
</div>

我尝试使用下列CSS:

I've tried using the following CSS:

.foo li:nth-child(1),
.foo li:nth-child(3)
{
    color:red;
}

但是,正如所料,这是每个 ul (演示: http://jsfiddle.net/hTfVu/

However, as expected, this is styling the first child of each ul. (Demo: http://jsfiddle.net/hTfVu/)

如何更改我的CSS,以便我可以定位属于的第一个和第三个 li 。 foo

How can I change my CSS so that I can target the 1st and 3rd li belonging to .foo?

推荐答案

你不能单独使用CSS选择器。 :nth-​​child()和兄弟姐妹组合器仅限于共享相同父元素的子元素/兄弟元素,如其名称所隐含的,CSS选择器不能解释父元素-child结构,也没有任何像:nth-​​grandchild()选择器(甚至 :nth-​​match()

You can't do that with CSS selectors alone. :nth-child() and sibling combinators are limited to children/siblings sharing the same parent only, as implied by their names, and CSS selectors cannot account for such variations in parent-child structure, nor is there anything like an :nth-grandchild() selector (even :nth-match() from Selectors 4 limits itself to elements sharing the same parent only).

当然,像jQuery这样的东西变得微不足道: $('。foo li:eq(0),.foo li: eq(2)')否则,你必须使用类或ID明确标记第一个和第三个 li 元素,然后选择它们。

Of course with something like jQuery it becomes trivial: $('.foo li:eq(0), .foo li:eq(2)') Otherwise you'll have to mark the first and third li elements explicitly using classes or IDs, and then select them.

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