css counter-increment 跳过 :before 时不需要的重置

Question

我的计数器有问题，我用它来获取 h3、h4 和 h5 之前的数字，例如列表。只有当标签有 class="count" 时，该数字才应该可见，并且它只有在下面的 header 中才应该 counter-reset。

当我跳过在 h3 上显示数字时，h4s 计数器会变得一团糟，跳过 h4 也是如此。有人知道为什么吗？

body {
  counter-reset: h3
}
h3 {
  counter-reset: h4
}
h4 {
  counter-reset: h5
}
h3.count:before {
  counter-increment: h3;
  content: counter(h3) ". "
}
h4.count:before {
  counter-increment: h4;
  content: counter(h3) "." counter(h4) ". "
}
h5.count:before {
  counter-increment: h5;
  content: counter(h3) "." counter(h4) "." counter(h5) ". "
}
h3:before,
h4:before,
h5:before {
  content: "";
  counter-increment: none
}

<h3 class="count">: should be : 1</h3>
<h4 class="count">: should be : 1.1</h4>
<h5 class="count">: should be : 1.1.1</h5>
<h5>No counter</h5>
<h5 class="count">: should be : 1.1.2</h5>
<h4>No counter</h4>
<h5 class="count">: should be : <span style="color: #ff0000">1.1.3</span></h5>
<h5>No counter</h5>
<h5 class="count">: should be : <span style="color: #ff0000">1.1.4</span></h5>
<h4 class="count">: should be : 1.2</h4>
<h3>No counter</h3>
<h4 class="count">: should be : <span style="color: #ff0000">1.3</span></h4>
<h5 class="count">: should be : <span style="color: #ff0000">1.3.1</span></h5>
<h5>No counter</h5>
<h5 class="count">: should be : <span style="color: #ff0000">1.3.2</span></h5>
<h4>No counter</h4>
<h5 class="count">: should be : <span style="color: #ff0000">1.3.3</span></h5>
<h5>No counter</h5>
<h5 class="count">: should be : <span style="color: #ff0000">1.3.4</span></h5>
<h4 class="count">: should be : <span style="color: #ff0000">1.4</span></h4>
<h3 class="count">: should be : 2</h3>
<h5 class="count">: should be : 2.0.1</h5>
<h4 class="count">: should be : 2.1</h4>
<h5 class="count">: should be : 2.1.1</h5>
<h5>No counter</h5>
<h5 class="count">: should be : 2.1.2</h5>

css

body {counter-reset: h3}
h3 {counter-reset: h4}
h4 {counter-reset: h5}

h3.count:before { counter-increment: h3; content: counter(h3) ". "}
h4.count:before { counter-increment: h4; content: counter(h3) "." counter(h4) ". "}
h5.count:before { counter-increment: h5; content: counter(h3) "." counter(h4) "." counter(h5) ". "}

h3:before, 
h4:before, 
h5:before{ content: ""; counter-increment: none }

html

<h3 class="count">: should be : 1</h3>
<h4 class="count">: should be : 1.1</h4>
<h5 class="count">: should be : 1.1.1</h5>
<h5>No counter</h5>
<h5 class="count">: should be : 1.1.2</h5>
<h4>No counter</h4>
<h5 class="count">: should be : 1.1.3</span></h5>
<h5>No counter</h5>
<h5 class="count">: should be : 1.1.4</span></h5>
<h4 class="count">: should be : 1.2</h4>

结果

1. : should be : 1
1.1. : should be : 1.1
1.1.1. : should be : 1.1.1
No counter
1.1.2. : should be : 1.1.2
No counter
1.1.1. : should be : 1.1.3
No counter
1.1.2. : should be : 1.1.4
1.2. : should be : 1.2

代码：http://jsfiddle.net/6gj2r1jd/

Answer 1

根据您的 CSS 计数器代码，只要您遇到 h4 标记，就应该重置 h5 计数器的值。

body {counter-reset: h3}
h3 {counter-reset: h4}
h4 {counter-reset: h5} /* this one */

因为上面的代码，当浏览器遇到没有class的h4标签（内容为No Counter）的计数器值h5 计数器重置为 0。这就是为什么您得到的值不是 1.1.3 的原因 1.1.1

<h5 class="count">: should be : 1.1.2</h5>
<h4>No counter</h4> <!-- This line would cause h5 counter to reset -->
<h5 class="count">: should be : 1.1.3</span></h5>

如果我对你的问题的理解是正确的，那么你真正需要的是只有当标题标签有 class="count" 时才重置计数器。因此，像下面这样修改 counter-reset CSS 代码应该可以解决问题。

h3.count {counter-reset: h4}
h4.count {counter-reset: h5}

body {
  counter-reset: h3
}
h3.count {
  counter-reset: h4
}
h4.count {
  counter-reset: h5
}
h3.count:before {
  counter-increment: h3;
  content: counter(h3)". "
}
h4.count:before {
  counter-increment: h4;
  content: counter(h3)"." counter(h4)". "
}
h5.count:before {
  counter-increment: h5;
  content: counter(h3)"." counter(h4)"." counter(h5)". "
}
h3:before,
h4:before,
h5:before {
  content: "";
  counter-increment: none
}

<h3 class="count">: should be : 1</h3>
<h4 class="count">: should be : 1.1</h4>
<h5 class="count">: should be : 1.1.1</h5>
<h5>No counter</h5>
<h5 class="count">: should be : 1.1.2</h5>
<h4>No counter</h4>
<h5 class="count">: should be : <span style="color: #ff0000">1.1.3</span></h5>
<h5>No counter</h5>
<h5 class="count">: should be : <span style="color: #ff0000">1.1.4</span></h5>
<h4 class="count">: should be : 1.2</h4>

<h3>No counter</h3>
<h4 class="count">: should be : <span style="color: #ff0000">1.3</span></h4>
<h5 class="count">: should be : <span style="color: #ff0000">1.3.1</span></h5>
<h5>No counter</h5>
<h5 class="count">: should be : <span style="color: #ff0000">1.3.2</span></h5>
<h4>No counter</h4>
<h5 class="count">: should be : <span style="color: #ff0000">1.3.3</span></h5>
<h5>No counter</h5>
<h5 class="count">: should be : <span style="color: #ff0000">1.3.4</span></h5>
<h4 class="count">: should be : <span style="color: #ff0000">1.4</span></h4>

<h3 class="count">: should be : 2</h3>
<h5 class="count">: should be : 2.0.1</h5>
<h4 class="count">: should be : 2.1</h4>
<h5 class="count">: should be : 2.1.1</h5>
<h5>No counter</h5>
<h5 class="count">: should be : 2.1.2</h5>

css counter-increment 跳过 :before 时不需要的重置

css counter-increment unwanted reset when skipping :before

html

css

css-counter