CSS编码顺序研究,提高CSS编码效率
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最后定义的 CSS 样式将会覆盖在其之前定义的所有已经存在、或与之冲突的样式,比如下面这个例子:
示例代码 [www.Mb5u.com]
p { color: red; background: yellow }
p { color: green }
以上的段落最终将呈现绿色的字体,并带有黄色的背景,这是因为最后定义的 color:green 将之前定义的 red 覆盖掉了,至于黄色背景为何没有消失,那是因为第二个 p 的定义中并没有与之冲突的定义,因此它还是有效的。
你真的懂了吗?好,我们来做个小测试:
示例代码 [www.Mb5u.com]
p.red { color: red }
p.green { color: green }
p.blue { color: blue }
示例代码 [www.Mb5u.com]
Sample text. Mb5u.com
Sample text. Mb5u.com
Sample text. Mb5u.com
请问,最终显示的时候,上面三个段落中的文字都将呈现何种颜色呢?
答案是它们都显示为 blue ,也就是蓝色,尽管每个段落都以不同顺序应用了三个 p
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样式,看上去应该按照应用样式的顺序来决定颜色,比如,第一个显示为 blue ,第二个显示为 red ,第三个显示为 green
,其实这是错误的,这与应用样式的顺序无关,它们最终都听从最后指定的样式,颜色皆为 blue 。
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