CSS |反增量属性
原文:https://www . geesforgeks . org/CSS-counter-increment-property/
CSS 计数器递增属性用于递增/递减计数器的值。CSS 计数器是一个变量，用于跟踪一个变量被使用的次数。
语法:
counter-increment: none | identifier | initial | inherit;
默认值:无
属性值:
无:这是默认值，此时不会增加计数器。 语法:
counter-increment: none;
例:
超文本标记语言
<!DOCTYPE html>
<html>
<head>
<title>CSS counter-increment Property</title>
<style>
h1 {
color: green;
}
body {
}
<!-- The h2::before selector inserts something
before the content of each selected element -->
h2::before {
counter-increment: none;
}
</style>
</head>
<body>
<h1>Welcome to GeeksforGeeks</h1>
<h1>Courses: </h1>
<h2>Fork Python</h2>
<h2>Fork Java</h2>
<h2>Fork CPP</h2>
<h2>Sudo Gate</h2>
</body>
</html>
输出:
标识符:标识符值用于定义要递增的计数器。该值还采用一个数字，该数字定义了增量的大小。该增量值的默认值为 1(如果选择器尚未复位，则默认值为 0)。该值也采用负值。 语法:
counter-increment: identifier;
例:
超文本标记语言
<!DOCTYPE html>
<html>
<head>
<title>CSS counter-increment Property</title>
<style>
h1 {
color: green;
}
body {
<!-- Set "geek-counter" identifier to 0 -->
counter-reset: geek-counter;
}
<!-- The h2::before selector inserts something
before the content of each selected element -->
h2::before {
<!-- Increment "geek-counter" by 1 -->
counter-increment: geek-counter;
content: "Course " counter(geek-counter) ": ";
}
</style>
</head>
<body>
<h1>Welcome to GeeksforGeeks</h1>
<h1>Courses: </h1>
<h2>Fork Python</h2>
<h2>Fork Java</h2>
<h2>Fork CPP</h2>
<h2>Sudo Gate</h2>
</body>
</html>
输出:
初始值:该值将属性设置为默认值。 语法:
counter-increment: initial;
例:
超文本标记语言
<!DOCTYPE html>
<html>
<head>
<style>
body {
/* Set "my-geek-counter" to 1*/
counter-reset: my-geek-counter 1;
}
h2::before {
/* Sets the initial value
which is 1 here for the counter */
counter-increment: initial;
content: "Section " counter(my-geek-counter) ". ";
}
}
</style>
</head>
<body>
<h1>Welcome to GeeksforGeeks</h1>
<h1>Courses: </h1>
<h2>Fork Python</h2>
<h2>Fork Java</h2>
<h2>Fork CPP</h2>
<h2>Sudo Gate</h2>
</body>
</html>
输出:
inherit: 该值从其父元素继承该属性。 语法:
counter-increment: inherit;
例:
超文本标记语言
<!DOCTYPE html>
<html>
<head>
<style>
body {
/* Set "my-geek-counter" to 1*/
counter-reset: my-geek-counter 1;
}
h2::before {
/* Sets the initial value
which is 1 here for the counter */
counter-increment: inherit;
content: "Section " counter(my-geek-counter) ". ";
}
}
</style>
</head>
<body>
<h1>Welcome to GeeksforGeeks</h1>
<h1>Courses: </h1>
<h2>Fork Python</h2>
<h2>Fork Java</h2>
<h2>Fork CPP</h2>
<h2>Sudo Gate</h2>
</body>
</html>
输出:
支持的浏览器反增量属性支持的浏览器如下:
- 谷歌 Chrome 2.0
- 互联网探索 8.0
- Firefox 1.0
- 歌剧 9.2
- 苹果 Safari 3.0
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