为什么叫伪类?

问题描述

a:hover

为什么叫伪类"?

与类"的概念有什么相似之处吗?

Are there any similarities with the concept of "class"?

推荐答案

在 CSS 术语中，类是一个以句号开头的选择器，例如

In CSS terms, a class is a selector that starts with a full stop, e.g.

.foo { ... }

它会以表格形式使用

<div class="foo">

类"的这种用法更多是指具有共同特征并通过种类或质量与其他事物区分开来的一组或类别的事物"，而不是借用面向对象的术语.

This use of "class" is more in the sense "a set or category of things having a common characteristic and differentiated from others by kind or quality", rather than borrowing from OO terminology.

伪类不是一个真正的类"，因为用户代理定义了何时和/或多少内容符合条件(如 :hover、:active 等).

A pseudo class is "not quite a real one" as the user agent defines when and/or how much content qualifies (like :hover, :active, etc).