問(wèn)題描述

img[class*="align"] 在 CSS 中是什么意思?

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

我在許多樣式表中都看到了這一點(diǎn)，但我不確定為什么要使用它以及它的作用.有什么想法嗎?

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

推薦答案

這是一個(gè)屬性選擇器 匹配任何 img 標(biāo)記類文本，包括align".例如，它將匹配以下任何一項(xiàng):

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" />

來(lái)自文檔(上面鏈接):

From the documentation (linked above):

E[foo*="bar"] - 一個(gè) E 元素，其 "foo" 屬性值包含子字符串 "bar"

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

這在流行的 CSS 框架中用于設(shè)置多個(gè)相似類的樣式，而不必為每個(gè)類添加一個(gè)新的相同類.例如，如果我們有以下標(biāo)記:

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>

我們可以將樣式應(yīng)用于類包含para-"的所有 p 元素，而無(wú)需手動(dòng)鍵入所有變體，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-"] { ... }

這是一個(gè) JSFiddle 示例，它正在使用中.

Here is a JSFiddle example of this in use.

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