css计数器的使用counter-increment

 

section {
    display: flex;
    100%;
    background: blue;
    counter-increment: row;
    line-height: 50px;
}
section:before{
    content:"第"counter(row)"行";
    color:#fff;
}
section div{
      counter-increment: ccc;
      background: red;
      color:#fff;
      height:50px;
      line-height: 50px;
      50px;
      text-align: center;
  }

section div:before{
    content:counter(ccc);
}

<section>
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</section>
<section>
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</section>
<section>
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</section><section>
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</section><section>
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</section><section>
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</section>