仅当第一个元素具有其他同级对象时才定位 | 仅当第一个元素具有其他同级对象时才定位

本文介绍了仅当第一个元素具有其他同级对象时才定位的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

不添加任何类(或触摸HTML)，是否只有在该div中有第二个元素的情况下才可以将div中的第一个元素作为目标?以下是我的HTML:

Without adding any classes (or touching the HTML) is there a way to target the first element inside a div ONLY if there is a second element in that div? Below is my HTML:

<div class="grid">
    <div class="content">I WANT TO APPLY CSS TO THIS</div>
    <div class="content">But only if there is 2nd .content element in the same parent element</div>
</div>
<div class="grid">
    <div class="content">Don't apply here</div>
</div>
<div class="grid">
    <div class="content">Don't apply here</div>
</div>
<div class="grid">
    <div class="content">I WANT TO APPLY CSS TO THIS</div>
    <div class="content">But only if there is 2nd .content element in the same parent element</div>
</div>

与此相关的一些上下文信息可以获取更好的图片...如果.content是.grid中唯一的.content，我想将其居中.但是，如果有两个.content div，那么我希望它们彼此相邻浮动.

A few context to this for a better picture ... I want to center the .content if it's the only .content inside .grid. But if there are two .content divs, then I want them to float next to each other.

注意:

我已经知道我可以通过

.grid .content:nth-child(2) { ... }

推荐答案

.grid > .content:first-child:not(:only-child) {
    color: blue;
}

<div class="grid">
    <div class="content">I WANT TO APPLY CSS TO THIS</div>
    <div class="content">But only if there is 2nd .content element in the same parent element</div>
</div>
<div class="grid">
    <div class="content">Don't apply here</div>
</div>
<div class="grid">
    <div class="content">Don't apply here</div>
</div>
<div class="grid">
    <div class="content">I WANT TO APPLY CSS TO THIS</div>
    <div class="content">But only if there is 2nd .content element in the same parent element</div>
</div>

:first-child:not(:only-child)将是您的选择器.

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