浅析css计数器

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计数器有两个关键属性

  1. counter-reset 计数器重置
    设置初始值：counter-reset: num 1
    默认的初始值为 0
    可以设置多个：counter-reset: num1 1 num2 2;
  2. counter-increment 计数器规则，计数器递增的意思
    设置计数：counter-increment: num 2;
    默认的值为 1
    可以设置多个：counter-increment: num1 1 num2 2;
    注：每次重新设置此属性的时候，counter都会变化
  3. counter 计算结果
    使用：content: counter(num)
    疑惑：如何能将两个不同的name计算

demo1:

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .tag {
      counter-increment: num;
    }
    .main {
      counter-reset: num;
    }
    .num::after{
      content: counter(num);
    }
  </style>
</head>
<body>
  <div class="main">
    <div class="tag"></div>
    <div class="tag"></div>
    <div class="tag"></div>
  </div>
  <div class="num"></div>
</body>
</html>

demo2:

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .tag {
      counter-increment: num1 2 num2 3;
    }
    .main {
      counter-reset: num1 num2;
    }
    .num::after{
      content: counter(num1) counter(num2);
    }
  </style>
</head>
<body>
  <div class="main">
    <div class="tag"></div>
    <div class="tag"></div>
    <div class="tag"></div>
  </div>
  <div class="num"></div>
</body>
</html>

详细的可以：参考这个文章，写的很详细