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      • css教程之CSS 派生選擇器

      • 2015-01-17 19:06 來源:未知
      CSS 派生選擇器(相關css教程
      派生選擇器
      通過依據元素在其位置的上下文關系來定義樣式,你可以使標記更加簡潔。
      在 CSS1 中,通過這種方式來應用規則的選擇器被稱為上下文選擇器 (contextual selectors),這是由于它們依賴于上下文關系來應用或者避免某項規則。在 CSS2 中,它們稱為派生選擇器,但是無論你如何稱呼它們,它們的作用都是相同的。
      派生選擇器允許你根據文檔的上下文關系來確定某個標簽的樣式。通過合理地使用派生選擇器,我們可以使 HTML 代碼變得更加整潔。
      比方說,你希望列表中的 strong 元素變為斜體字,而不是通常的粗體字,可以這樣定義一個派生選擇器:
      li strong {
          font-style: italic;
          font-weight: normal;
        }
      請注意標記為 <strong> 的藍色代碼的上下文關系:
      <p><strong>我是粗體字,不是斜體字,因為我不在列表當中,所以這個規則對我不起作用</strong></p>
       
      <ol>
      <li><strong>我是斜體字。這是因為 strong 元素位于 li 元素內。</strong></li>
      <li>我是正常的字體。</li>
      </ol>
      在上面的例子中,只有 li 元素中的 strong 元素的樣式為斜體字,無需為 strong 元素定義特別的 class 或 id,代碼更加簡潔。
      再看看下面的 CSS 規則:
      strong {
           color: red;
           }
       
      h2 {
           color: red;
           }
       
      h2 strong {
           color: blue;
           }
      下面是它施加影響的 HTML:
      <p>The strongly emphasized word in this paragraph is<strong>red</strong>.</p>
      <h2>This subhead is also red.</h2>
      <h2>The strongly emphasized word in this subhead is<strong>blue</strong>.</h2>
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