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HomeWeb Front-endHTML TutorialCSS3 计数器_html/css_WEB-ITnose

CSS3 计数器(CSS Counters)可以允许我们使用css对页面的 任意元素进行计数,实现类似于有序列表 的功能。

与有序列表相比,它的突出特性在于可以对任意元素计数,同时实现个性化计数。


计数器相关属性一览:


属性 属性说明
counter-reset 定义计数器,包括初始值、作用域等
counter-increment 设置计数器的增数
content 早::before和::after中生成内容
counter() 在content属性中使用,用来调用计数器
@counter-style 自定义列表样式


语法

counter-reset :[?]+|none|inherit


含义

    用来定义计数器的初值和作用域,默认值为none。

     :计数器名称

     :计数器的初始值

     当元素display为None时,该属性失效

计数器定义方式解析

代码 代码解析
counter-reset:counterA 定义计数器counterA,初始值为默认值0
counter-reset:counterA 6; 定义计数器counterA,初始值为6
counter-reset:counterA 4,counterB; 定义计数器counterA、counterB,初始值分别为4和0
counter-reset:counterA 4,counterB 2; 定义计数器counterA、counterB,初始值分别为4和2

语法

   counter-increment:[?]+|none

含义

   用来增数计数器,默认值为none(阻止计数器增加)

   :需要增数的计数器名称

      :计数器增数的值,可以为负值。

   我们可以同时增数多个计数器

   当元素display为none时,该属性失效。



计数器增数方式解析

代码 代码解析
counter-increment:counterA 增数计数器counterA,每次增加1
counter-increment:counterA 2 增数计数器counterB,每次增加2
counter-increment:counterA 2,counterB -1 同时增数计数器counterA、counterB,分别加2、-1


语法

   content :[]+

    = counter(name)|counter(name,list-style-type)|counters(name,string)|

               counters(name,string,list-style-type)

含义

   使用计数器,需要结合::before和::after使用。可以同时使用多个计数器。



计数器使用方式解析

代码 代码解析
content:"Fig." counter(imgCounter); 混合字符串和计数器imgCounter
content:"Fig." counter(imgCounter,lower-alpha) 指定计数器的列表格式
content:counters(section,".") " ";  在计数器之间加上点号,同时在计数器最加上一个空格
content:counters(section,".",lower-roman) " "; 定义计数器为小写罗马数字格式,同时加点号,空格

语法格式


@counter-style counterStyleName{

     system:算法;

     range:使用范围;

     symbols:符合;or additive-symbols:符号;

     prefix:前缀;suffix:后缀;

     pad:补零(eg.01,02,03);

     negative:负数策略:

     fallback:出错后的默认值;

     speakas:语音策略;

}


自定义counter style示例

@counter-style cjk-heavenly-stem{

    system:alphabetic;

      symbols:"\7532" "\4E59" "\4E19" "\4E01" "\620A" "\5DF1" "\5E9A" "\8F9B" "\58EC" "\7678";

/*甲 乙 丙 丁 戊 己 庚 辛 壬 葵*/

    suffix:"、";

}


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