写给初学者css优先级问题_html/css_WEB-ITnose
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{background-color；red;<br /> }<br /> </style><br /> </head><br /> 此时div的背景色为red;<br />
<head><br /> <style><br /> div{ 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>此时div的背景色为blue；<br />
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。
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。
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