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探究css!important的应用之道_html/css_WEB-ITnose
探究css!important的应用之道_html/css_WEB-ITnose
时间:2021-07-01 10:21:17
帮助过:29人阅读
定义及语法: !important是CSS1就定义的语法,作用是提高指定样式规则的应用优先权。
语法格式:{ cssRule !important },即将!important写在定义的最后面,
例如:
box{color:red !important;}
兼容性:
应用场景:
场景一:
The daimler executive familiar with the collaboration said daimler and byd might display a prototype of the jointly developed car as early as the paris auto show in october. 熟悉合作情况的戴姆勒高管说,戴姆勒和比亚迪最早有可能于10月份在巴黎车展上展出这款合作开发汽车的样车。
The daimler executive familiar with the collaboration said daimler and byd might display a prototype of the jointly developed car as early as the paris auto show in october. 熟悉合作情况的戴姆勒高管说,戴姆勒和比亚迪最早有可能于10月份在巴黎车展上展出这款合作开发汽车的样车。
#content p{ color: orange; } .p1{color: blue;} .p2{color:blue !important;}
显示效果:
注:
默认情况下,class的优先级小于id,所以,p1中即使用class重定义了自身样式,也无法生效,所以继承父级属性,这行字还是orange!
但是,p2中,用了important提升优先级(或看成强制重定义),所以这里的css得以生效,这行字变为了蓝色!
场景二:
The daimler executive familiar with the collaboration said daimler and byd might display a prototype of the jointly developed car as early as the paris auto show in october. 熟悉合作情况的戴姆勒高管说,戴姆勒和比亚迪最早有可能于10月份在巴黎车展上展出这款合作开发汽车的样车。
/*应用场景二*/ .color1{color: blue;} .color2{color:orange !important;}
显示效果:
注:
当出现多个class共同控制某个样式时,可以根据需求,在某个class里面通过!important来
优先显示
在线演示:http://codepen.io/anon/pen/OVjXPQ