counter-reset
Baseline Widely available *
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
* Some parts of this feature may have varying levels of support.
counter-reset CSS 属性用于创建具名 CSS 计数器,并将其初始化为指定值。它支持创建从 1 向上计数到元素数量的计数器,以及从元素数量向下计数到 1 的计数器。
尝试一下
counter-reset: none; counter-reset: chapter-count 0; counter-reset: chapter-count; counter-reset: chapter-count 5; counter-reset: chapter-count -5; <section class="default-example" id="default-example"> <div class="transition-all" id="chapters"> <h1>Alice's Adventures in Wonderland</h1> <h2>Down the Rabbit-Hole</h2> <h2 id="example-element">The Pool of Tears</h2> <h2>A Caucus-Race and a Long Tale</h2> <h2>The Rabbit Sends in a Little Bill</h2> </div> </section> #default-example { text-align: left; counter-reset: chapter-count; } #example-element { background-color: lightblue; color: black; } h2 { counter-increment: chapter-count; font-size: 1em; } h2::before { content: "Chapter " counters(chapter-count, ".") ": "; } 备注:计数器的值能够通过 CSS 属性 counter-increment 控制递增或递减。
语法
css
/* Set counter-name to 0 */ counter-reset: counter-name; /* Set counter-name to -1 */ counter-reset: counter-name -1; /* Set counter1 to 1, and counter2 to 4 */ counter-reset: counter1 1 counter2 4; /* Cancel any reset that could have been set in less specific rules */ counter-reset: none; /* Global values */ counter-reset: inherit; counter-reset: initial; counter-reset: unset; counter-reset 属性可以指定为以下之一:
<自定义 ID> [<数值>]。你可以指定任意数量的计数器进行重置,每个名称或“名称 - 数字”对之间用空格分隔。- 特殊值
none。
可选值
<custom-ident>-
要递增的计数器的名称。
备注:该名称由不区分大小写的字母 a 到 z,数字 0 到 9,下划线(_)和 / 或短划线( - )的组合组成,并且第一个非破折号字符必须是一个字母(即,在它的开头没有数字,即使前面有破折号)。此外,在标识符的开头禁止使用两个破折号。在任何案例组合中都不能是 none,unset,initial 或 inherit。
语法形式
counter-reset =
[ <counter-name> <integer>? | <reversed-counter-name> <integer>? ]+ |
none
<reversed-counter-name> =
reversed( <counter-name> )
示例
css
h1 { counter-reset: chapter section 1 page; /* Sets the chapter and page counters to 0 and the section counter to 1. */ } 规范
| Specification |
|---|
| CSS Lists and Counters Module Level 3> # counter-reset> |
浏览器兼容性
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参考
- CSS Counters,
counter-increment counter-incrementcounter-set@counter-stylecounter()andcounters()functionscontentproperty