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      首頁 > 網站開發 > css >
      • css教程之CSS 單位

      • 2015-01-25 01:32 來源:未知
      CSS 單位(相關css教程
       長度單位
        一個長度的值由可選的正號" + "或負號" - "、接著的一個數字、還有標明單位的兩個字母組成。在一個長度的值之中是沒有空格的,例如,1.3 em就不是一個有效的長度的值,但1.3em就是有效的。一個為零的長度不需要兩個字母的單位聲明。
        無論是相對值還是絕對值長度,CSS1都支持。相對值單位確定一個相對于另一長度屬性的長度,因為它能更好地適應不同的媒體,所以是首選的。以下是有效的相對單位:
      • em (em,元素的字體的高度)
      • ex (x-height,字母 "x" 的高度)
      • px (像素,相對于屏幕的分辨率)
        絕對長度單位視輸出介質而定,所以遜色于相對單位。以下是有效的絕對單位:
      • in (英寸,1英寸=2.54厘米)
      • cm (厘米,1厘米=10毫米)
      • mm (米)
      • pt (點,1點=1/72英寸)
      • pc (帕,1帕=12點)
       百分比單位
        一個百分比值由可選的正號"+"或負號"-"、接著的一個數字,還有百分號"%"。在一個百分比值之中是沒有空格的。
        百分比值是相對于其它數值,同樣地用于定義每個屬性。最經常使用的百分比值是相對于元素的字體大小。
       顏色單位
        顏色值是一個關鍵字或一個RGB格式的數字。
        Windows VGA(視頻圖像陣列)形成了16各關鍵字: aquablackbluefuchsiagraygreenlimemaroonnavyolivepurpleredsilvertealwhite,and yellow
        RGB顏色可以有四種形式:
      • #rrggbb (#00cc00)
      • #rgb (#0c0)
      • rgb(x,x,x) x是一個介乎0到255之間的整數 (rgb(0,204,0))
      • rgb(y%,y%,y%) y是一個介乎0.0到100.0之間的整數 (rgb(0%,80%,0%))
        上述的例子指定同一顏色。
      Douglas R. Jacobson先生還開發了速查手冊RGB Color Chart (61 kB)。

       統一資源管理URLs
        一個URL值的格式為 : url(foo)foo是一個URL(統一資源管理,因特網的地址)。URL可以選擇用單引號( ' )或者雙引號( " ),并且,在URL之前或之后可以包含空格。
        在URL中的括弧,逗號,空格,單引號,或雙引號必須避開反斜杠。不完整的URLs被理解為樣式表的源代碼,而不是HTML源代碼。
      注意: Netscape Navigator 4.x 會錯誤地將不完整的URLs理解為相關的HTML源代碼。注意到這個錯誤后,網頁制作者應該在可能的地方使用完整的URLs。
        例如:
      BODY { background: url(stripe.gif) }
      BODY { background: url(http://www.htmlhelp.com/stripe.gif) }
      BODY { background: url( stripe.gif ) }
      BODY { background: url("stripe.gif") }
      BODY { background: url(\"Ulalume\".png) } /* quotes in URL escaped */
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