问题描述

鉴于以下类声明和代码...

Given the following class declarations and code...

.foo > a { color:green; }
.bar a { color:red; }

<div class="bar">
    <div class="foo">
        <a href="#">SOME LINK</a>
    </div>
</div>

... 我认为链接会是绿色的，因为虽然两个声明都有一个类 (010) 和一个元素 (001)，但 .foo 有直接后代选择器.但是，唉，链接是红色的.为什么?

... I thought that the link would be green because, while both declarations have a class (010) and an element (001), .foo has the direct descendant selector. But alas, the link is red. Why?

推荐答案

> 对于 css 特异性没有任何价值.

There's no value for > for css specificity.

这两种情况都有 11 个特异性值:

Both case have 11 value for specificity:

.foo > a { color:green; }/*specificity value is 11*/
.bar a { color:red; }/*specificity value is 11*/

<小时>

在您的情况下，您可以像这样使用以获得更大的特异性:

In your case you may use like this to have greater specificty:

.bar .foo > a { color:green; }/*greater specificity value is 21*/
.foo a { color:red; }/*specificity value is 11*/

<小时>

好的，我将在这里添加特异性的工作原理:

Ok, I'm going add here how specificity works:

Selector                          Specificity         Specificity in large base
inline-style                      1 0 0 0             1000
id selector                       0 1 0 0              100
class,pseudo,attribute selector   0 0 1 0               10
type selector and pseudo elements 0 0 0 1                1