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class - HTMLï¼ˆè¶…æ–‡æœ¬æ ‡è®°è¯è¨€ï¼‰ | MDN

全局属性 class 的值是一个以空格分隔的元素的类名（classes）列表，它允许 CSS 和 Javascript 通过类选择器 (class selectors) 或 DOM 方法 ( document.getElementsByClassName) 来选择和访问特定的元素。

<p>Narrator: This is the beginning of the play.</p>

<p class="note editorial">Above point sounds a bit obvious. Remove/rewrite?</p>

<p>Narrator: I must warn you now folks that this beginning is very exciting.</p>

<p class="note">[Lights go up and wind blows; Caspian enters stage right]</p>

.note {
  font-style: italic;
  font-weight: bold;
}

.editorial {
  background: rgb(255, 0, 0, 0.25);
  padding: 10px;
}

.editorial:before {
  content: "Editor: ";
}

尽管对 class 的命名没有要求，但 web 开发者最好使用可以表达元素语义目的的名称，而不是描述元素展现的名称（即使一个元素是斜体，但是 class 的命名也不应该是 italics）。语义化命名即使在页面展现发生改变时仍能合乎逻辑。

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