使用 CSS Counter 為每個專案編號

CSS

body {
  counter-reset: item-counter; /* create the counter */
}
.item {
  counter-increment: item-counter; /* increment the counter every time an element with class "item" is encountered */
}
.item-header:before {
  content: counter(item-counter) ". "; /* print the value of the counter before the header and append a "." to it */
}

/* just for demo */

.item {
  border: 1px solid;
  height: 100px;
  margin-bottom: 10px;
}
.item-header {
  border-bottom: 1px solid;
  height: 40px;
  line-height: 40px;
  padding: 5px;
}
.item-content {
  padding: 8px;
}

HTML

<div class='item'>
  <div class='item-header'>Item 1 Header</div>
  <div class='item-content'>Lorem Ipsum Dolor Sit Amet....</div>
</div>
<div class='item'>
  <div class='item-header'>Item 2 Header</div>
  <div class='item-content'>Lorem Ipsum Dolor Sit Amet....</div>
</div>
<div class='item'>
  <div class='item-header'>Item 3 Header</div>
  <div class='item-content'>Lorem Ipsum Dolor Sit Amet....</div>
</div>

上面的例子對頁面中的每個 item 進行編號，並在其標題之前新增專案的編號（使用 .item-header 元素的:before 偽的 content 屬性）。此處提供此程式碼的現場演示。