CSS counter-increment用法及代碼示例

CSS counter-increment屬性用於遞增/遞減計數器的值。 CSS計數器是一個變量，用於跟蹤使用變量的次數。

用法:

counter-increment:none | identifier | initial | inherit;

屬性值：

none:這是默認值，因此不會增加計數器。

用法:

counter-increment:none;

例：

<!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>

輸出：

identifier:標識符值用於定義要遞增的計數器。該值也采用一個數字，該數字定義將進行多少增量。此增量值的默認值為1(如果尚未重置選擇器，則默認值為0)。該值也取負值。

用法:

counter-increment:identifier;

例：

<!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>

輸出：

initial:此值將屬性設置為其默認值。

用法:

counter-increment:initial;

例：

<!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>

輸出：

inherit:此值從其父元素繼承此屬性。

用法:

counter-increment:inherit;

例：

<!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>

輸出：

支持的瀏覽器以下列出了counter-increment屬性支持的瀏覽器：

穀歌瀏覽器2.0
Internet瀏覽器8.0
Firefox 1.0
Opera 9.2
蘋果Safari 3.0

相關用法

注：本文由純淨天空篩選整理自Abhishek7大神的英文原創作品 CSS | counter-increment Property。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。