CSS 中的 img[class*=“align"] 是什么意思?

2022-01-10 00:00:00 css-selectors html css

img[class*="align"] 在 CSS 中是什么意思?

What does img[class*="align"] mean in CSS?

我在许多样式表中都看到了这一点，但我不确定为什么要使用它以及它的作用.有什么想法吗?

I have seen this in many stylesheets, but I'm not sure why it's used and what it does. Any idea?

推荐答案

这是一个属性选择器 匹配任何 img 标记类文本，包括align".例如，它将匹配以下任何一项:

It's an attribute selector which matches any img tag class text including "align". For instance, it would match any of the following:

<img class="dummy align test" />
<img class="test align-1" />
<img class="hello-align" />
<img class="abaligncd" />
<img class="align" />

来自文档(上面链接):

From the documentation (linked above):

E[foo*="bar"] - 一个 E 元素，其 "foo" 属性值包含子字符串 "bar"

E[foo*="bar"] - an E element whose "foo" attribute value contains the substring "bar"

这在流行的 CSS 框架中用于设置多个相似类的样式，而不必为每个类添加一个新的相同类.例如，如果我们有以下标记:

This is used in popular CSS frameworks to style multiple similar classes without having to add a new identical class to each. For instance, if we had the following markup:

<p class="central para-red">Hello, world!</p>
<p class="para-green bold">Hello, world!</p>
<p class="para-blue">Hello, world!</p>
<p>Hello, world!</p>

我们可以将样式应用于类包含para-"的所有 p 元素，而无需手动键入所有变体，只需使用:

We could apply styling to all of the p elements whose class contains "para-" without having to manually type all the variations by simply using:

p[class*="para-"] { ... }

这是一个 JSFiddle 示例，它正在使用中.

Here is a JSFiddle example of this in use.

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