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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
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      • div+css視頻教程之CSS 概述

      • 2015-07-21 21:15 來源:未知
      CSS 概述
      ·  CSS 指層疊樣式表 (Cascading Style Sheets)
      ·  樣式定義如何顯示 HTML 元素
      ·  樣式通常存儲在樣式表
      ·  把樣式添加到 HTML 4.0 中,是為了解決內容與表現分離的問題
      ·  外部樣式表可以極大提高工作效率
      ·  外部樣式表通常存儲在 CSS 文件
      ·  多個樣式定義可層疊為一
      樣式解決了一個普遍的問題
      兩種主要的瀏覽器(Netscape 和 Internet Explorer)不斷地將新的 HTML 標簽和屬性(比如字體標簽和顏色屬性)添加到 HTML 規范中,創建文檔內容清晰地獨立于文檔表現層的站點變得越來越困難。
      為了解決這個問題,萬維網聯盟(W3C),這個非營利的標準化聯盟,肩負起了 HTML 標準化的使命,并在 HTML 4.0 之外創造出樣式(Style)。所有的主流瀏覽器均支持層疊樣式表。
      樣式表極大地提高了工作效率
      樣式表定義如何顯示 HTML 元素,就像 HTML 3.2 的字體標簽和顏色屬性所起的作用那樣。樣式通常保存在外部的 .css 文件中。通過僅僅編輯一個簡單的 CSS 文檔,外部樣式表使你有能力同時改變站點中所有頁面的布局和外觀。
      由于允許同時控制多重頁面的樣式和布局,CSS 可以稱得上 WEB 設計領域的一個突破。作為網站開發者,你能夠為每個 HTML 元素定義樣式,并將之應用于你希望的任意多的頁面中。如需進行全局的更新,只需簡單地改變樣式,然后網站中的所有元素均會自動地更新。
      多重樣式將層疊為一個
      樣式表允許以多種方式規定樣式信息。樣式可以規定在單個的 HTML 元素中,在 HTML 頁的頭元素中,或在一個外部的 CSS 文件中。甚至可以在同一個 HTML 文檔內部引用多個外部樣式表。
      層疊次序
      當同一個 HTML 元素被不止一個樣式定義時,會使用哪個樣式呢?
      一般而言,所有的樣式會根據下面的規則層疊于一個新的虛擬樣式表中,其中數字 4 擁有最高的優先權。
      1.    瀏覽器缺省設置
      2.    外部樣式表
      3.    內部樣式表(位于 <head> 標簽內部)
      4.    內聯樣式(在 HTML 元素內部)
      因此,內聯樣式(在 HTML 元素內部)擁有最高的優先權,這意味著它將優先于以下的樣式聲明:<head> 標簽中的樣式聲明,外部樣式表中的樣式聲明,或者瀏覽器中的樣式聲明(缺省值)。
       
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