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      • css教程之如何插入樣式表

      • 2015-01-22 23:58 來源:未知
      如何插入樣式表(相關css教程
      當讀到一個樣式表時,瀏覽器會根據它來格式化 HTML 文檔。插入樣式表的方法有三種:
      外部樣式表
      當樣式需要應用于很多頁面時,外部樣式表將是理想的選擇。在使用外部樣式表的情況下,你可以通過改變一個文件來改變整個站點的外觀。每個頁面使用 <link> 標簽鏈接到樣式表。<link> 標簽在(文檔的)頭部:
      <head>
      <link rel="stylesheet" type="text/css" href="mystyle.css" />
      </head>
      瀏覽器會從文件 mystyle.css 中讀到樣式聲明,并根據它來格式文檔。
      外部樣式表可以在任何文本編輯器中進行編輯。文件不能包含任何的 html 標簽。樣式表應該以 .css 擴展名進行保存。下面是一個樣式表文件的例子:
      hr {color: sienna;}
      p {margin-left: 20px;}
      body {background-image: url("images/back40.gif");}
      不要在屬性值與單位之間留有空格。假如你使用 “margin-left: 20 px” 而不是 “margin-left: 20px” ,它僅在 IE 6 中有效,但是在 Mozilla/Firefox 或 Netscape 中卻無法正常工作。
      內部樣式表
      當單個文檔需要特殊的樣式時,就應該使用內部樣式表。你可以使用 <style> 標簽在文檔頭部定義內部樣式表,就像這樣:
      <head>
      <style type="text/css">
        hr {color: sienna;}
        p {margin-left: 20px;}
        body {background-image: url("images/back40.gif");}
      </style>
      </head>
      內聯樣式
      由于要將表現和內容混雜在一起,內聯樣式會損失掉樣式表的許多優勢。請慎用這種方法,例如當樣式僅需要在一個元素上應用一次時。
      要使用內聯樣式,你需要在相關的標簽內使用樣式(style)屬性。Style 屬性可以包含任何 CSS 屬性。本例展示如何改變段落的顏色和左外邊距:
      <p style="color: sienna; margin-left: 20px">
      This is a paragraph
      </p>
      多重樣式
      如果某些屬性在不同的樣式表中被同樣的選擇器定義,那么屬性值將從更具體的樣式表中被繼承過來。
      例如,外部樣式表擁有針對 h3 選擇器的三個屬性:
      h3 {
        color: red;
        text-align: left;
        font-size: 8pt;
        }
      而內部樣式表擁有針對 h3 選擇器的兩個屬性:
      h3 {
        text-align: right;
        font-size: 20pt;
        }
      假如擁有內部樣式表的這個頁面同時與外部樣式表鏈接,那么 h3 得到的樣式是:
      color: red;
      text-align: right;
      font-size: 20pt;
      即顏色屬性將被繼承于外部樣式表,而文字排列(text-alignment)和字體尺寸(font-size)會被內部樣式表中的規則取代。
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