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      • css教程之CSS 類選擇器

      • 2015-01-17 19:08 來源:未知
      CSS 類選擇器(相關css教程
      CSS 中,類選擇器以一個點號顯示:
      .center {text-align: center}
      在上面的例子中,所有擁有 center 類的 HTML 元素均為居中。
      在下面的 HTML 代碼中,h1 和 p 元素都有 center 類。這意味著兩者都將遵守 ".center" 選擇器中的規則。
      <h1 class="center">
      This heading will be center-aligned
      </h1>
       
      <p class="center">
      This paragraph will also be center-aligned.
      </p>
      注意:類名的第一個字符不能使用數字!它無法在 Mozilla 或 Firefox 中起作用。
      id 一樣,class 也可被用作派生選擇器:
      .fancy td {
               color: #f60;
               background: #666;
               }
      在上面這個例子中,類名為 fancy 的更大的元素內部的表格單元都會以灰色背景顯示橙色文字。(名為 fancy 的更大的元素可能是一個表格或者一個 div)
      元素也可以基于它們的類而被選擇:
      td.fancy {
               color: #f60;
               background: #666;
               }
      在上面的例子中,類名為 fancy 的表格單元將是帶有灰色背景的橙色。
      <td class="fancy">
      你可以將類 fancy 分配給任何一個表格元素任意多的次數。那些以 fancy 標注的單元格都會是帶有灰色背景的橙色。那些沒有被分配名為 fancy 的類的單元格不會受這條規則的影響。還有一點值得注意,class 為 fancy 的段落也不會是帶有灰色背景的橙色,當然,任何其他被標注為 fancy 的元素也不會受這條規則的影響。這都是由于我們書寫這條規則的方式,這個效果被限制于被標注為 fancy 的表格單元(即使用 td 元素來選擇 fancy 類)。
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