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      • css教程之CSS 基礎語法

      • 2015-01-19 14:23 來源:未知
      CSS 語法(相關css教程
      CSS 語法由三部分構成:選擇器、屬性和值:
      selector {property: value}
      選擇器 (selector) 通常是你希望定義的 HTML 元素或標簽,屬性 (property) 是你希望改變的屬性,并且每個屬性都有一個值。屬性和值被冒號分開,并由花括號包圍,這樣就組成了一個完整的樣式聲明(declaration):
      body {color: blue}
      上面這行代碼的作用是將 body 元素內的文字顏色定義為藍色。在上述例子中,body 是選擇器,而包括在花括號內的的部分是聲明。聲明依次由兩部分構成:屬性和值,color 為屬性,blue 為值。
      值的不同寫法和單位
      除了英文單詞 red,我們還可以使用十六進制的顏色值 #ff0000:
      p { color: #ff0000; }
      為了節約字節,我們可以使用 CSS 的縮寫形式:
      p { color: #f00; }
      我們還可以通過兩種方法使用 RGB 值:
      p { color: rgb(255,0,0); }
      p { color: rgb(100%,0%,0%); }
      請注意,當使用 RGB 百分比時,即使當值為 0 時也要寫百分比符號。但是在其他的情況下就不需要這么做了。比如說,當尺寸為 0 像素時,0 之后不需要使用 px 單位,因為 0 就是 0,無論單位是什么。
      記得寫引號
      提示:如果值為若干單詞,則要給值加引號:
      p {font-family: "sans serif";}
      多重聲明:
      提示:如果要定義不止一個聲明,則需要用分號將每個聲明分開。下面的例子展示出如何定義一個紅色文字的居中段落。最后一條規則是不需要加分號的,因為分號在英語中是一個分隔符號,不是結束符號。然而,大多數有經驗的設計師會在每條聲明的末尾都加上分號,這么的好處是,當你從現有的規則中增減聲明時,會盡可能的減少出錯的可能性。就像這樣:
      p {text-align:center; color:red;}    
      你應該在每行只描述一個屬性,這樣可以增強樣式定義的可讀性,就像這樣:
      p {
        text-align: center;
        color: black;
        font-family: arial;
      }
      空格和大小寫敏感
      大多數樣式表包含不止一條規則,而大多數規則包含不止一個聲明。多重聲明和空格的使用使得樣式表更容易被編輯:
      body {
        color: #000;
        background: #fff;
        margin: 0;
        padding: 0;
        font-family: Georgia, Palatino, serif;
        }
      是否包含空格不會影響 CSS 在瀏覽器的工作效果,同樣,與 XHTML 不同,CSS 對大小寫不敏感。不過存在一個例外:如果涉及到與 HTML 文檔一起工作的話,class 和 id 名稱對大小寫是敏感的。
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