Home > Web Front-end > HTML Tutorial > 写给初学者css优先级问题_html/css_WEB-ITnose

写给初学者css优先级问题_html/css_WEB-ITnose

WBOY
Release: 2016-06-24 11:34:03
Original
1193 people have browsed it

首先需要搞清楚几个基本概念<br />  1.内嵌样式:<br />    写在元素标签内的例如:<div style="background-color:red">   </div><br />  2.内联样式:<br />    写在head的style例如:<head><br />                  <style><br />                      div{<br />                          background-color:red;<br />                        }<br />                  </style><br />               </head><br />  3.外部样式:<br />    link标签引入进来的例如:<link rel="stylesheet" href="1.css"/><br />   4.important:只要设置了important的优先级永远最高。例如:border:1px solid red !important;  <br />  优先级:!important > 内嵌(标签内)> 内联(style)=外部;<br />说明:这里很多初学者都会误会内联优先级要高与外部,实际上是相等的。例如:<br />    <head><br />        <link rel="stylesheet" href="1.css"/>//名为1的css文件中有div{background:blue;}<br />        <style><br />          div{
Copy after login
              background-color;red;<br />         }<br />       </style><br />    </head><br />    此时div的背景色为red;<br />
Copy after login
    <head><br />        <style><br />          div{
Copy after login
Copy after login
              background-color;red;<br />         }<br />       </style><br />       <link rel="stylesheet" href="1.css"/>//名为1的css文件中有div{background:blue;}<br />    </head>
Copy after login
    此时div的背景色为blue;<br />
Copy after login
选择器权重值:内嵌:1000;<br />    id:0100;<br />    class或伪类:0010;<br />    元素或伪元素:0001;<br />    *:0000;<br />说明:权重值越大优先级越高;权重值可以累加,但是不会越位,例如:<br />    嵌套十层div,然后有一个div元素选择器,该选择的权重值为000 10,而不是0010,仍旧比class或伪类选择器的权重值小。
Copy after login
权重值:内嵌(1000)>id(0100)>class/伪类(0010)>元素/伪元素(0001)> * 权重值越高优先级越高。 important永远最高。
Copy after login

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template