Home Web Front-end HTML Tutorial CSS权重是如何分配的_html/css_WEB-ITnose

CSS权重是如何分配的_html/css_WEB-ITnose

Jun 21, 2016 am 08:50 AM

CSS权重是由四个数值决定,看一张图比较好解释:

图里是英文的,我翻译过来分别说一下,4个等级的定义如下:

第一等:代表内联样式,如: style=””,权值为1000。

第二等:代表ID选择器,如:#content,权值为100。

第三等:代表类,伪类和属性选择器,如.content,权值为10。

第四等:代表类型选择器和伪元素选择器,如div p,权值为1。


最后把这些值加起来,再就是当前元素的权重了。


权重算出来了,但是某个元素到底用哪个样式,还有3个规则,:

1,如果样式上加有!important标记,例如:

p{ color: gray !important}
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那么始终采用这个标记的样式。


2,匹配的内容按照CSS权重排序,权重大的优先;

可以看到,CSS权重只是决定应用哪个样式的其中一个步骤,不过这个步骤是最复杂的,上面已经说过了。


3,如果权重也一样,按照它在CSS样式表里声明的顺序,后声明的优先,例如:

h1 {color: blue}h1 {color: red}
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最终胜出的是color: red。


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