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<H2>基本語法</H2><P>一個樣式(Style)的語法由三部分構(gòu)成：Selector(中文叫選擇器有點怪怪的，就用英文吧)，屬性(Property)，屬性值(Value)。</P><PRE>selector {property: value}</PRE><P>舉個例子，下面的代碼p就是selector，color就是屬性，blue就是屬性值。</P><PRE>p {color:blue}</PRE><P>HTML中所有的Tag都可以作為selector。</P><P><STRONG>注：如果你想為Style加多個屬性，在兩個屬性之間要用分號加以分隔。</STRONG>下面的Style就包含2個屬性，一個是對齊方式居中，一個字體顏色為紅，當中用分號分隔開。</P><PRE>p {text-align:center;color:red} </PRE><P>為了提高Style代碼的可讀性，你也可以分行寫：</P><PRE>p</PRE><PRE>{</PRE><PRE>text-align: center;</PRE><PRE>color: black;</PRE><PRE>font-family: arial</PRE><PRE>} </PRE><H2>組合(Grouping)</H2><P>你也可以將相同的屬性和屬性值賦予多個Selector。<STRONG>Selector之間用逗號分隔</STRONG>。</P><PRE>h1,h2,h3,h4,h5,h6 </PRE><PRE>{</PRE><PRE>color: red</PRE><PRE>}</PRE><P>上面的例子是將所有正文標題(<h1>到<h6>)的字體顏色都變成紅色。</P><H2>Class Selector</H2><P>利用Class Selector，你可以用同樣的HTML Tag構(gòu)成不同的樣式。比如說，你希望段落<p>有兩種樣式，一種是居中對齊，一種是居右對齊。你就可以寫如下樣式：</P><PRE>p.right {text-align:right}</PRE><PRE>p.center {text-align:center}</PRE><P>其中right和center就是兩個class。然后你就可以引用這兩個class，示例代碼如下：</P><PRE><p class="center">這一段居中顯示。</p></PRE><PRE><p class="right">這一段是居右顯示。</p></PRE><P><A href="../css_examples/005_class_selector.html">演示示例</A></P><P>你也可以不用HTML Tag，直接用.加上Class名稱作為一個Selector。示例代碼如下：</P><PRE>.center {text-align: center} </PRE><P>這種通用的Class Selector就沒有Tag的局限性，可以用于不同的Tag。比如：</P><PRE><h1 class = "center">這個標題居中顯示。</h1></PRE><PRE><p class = "center">這個段落居中顯示。</p></PRE><P><A href="../css_examples/004_class_selector_generic.html">演示示例</A></P><H2>Contextual Selector</H2><P>你可以為嵌入其它Tag的Tag定義樣式，示例代碼如下：</P><PRE>p em{color: red}</PRE><P>Em這個Tag嵌套在P里面。p em就叫做Contextual Selector，定義嵌套于P里的Em的樣式。這個例子表示，在P里面的用Em這個Tag標記的字體顏色是紅色。</P><P><A href="../css_examples/006_contextual_selector.html">演示示例</A></P><H2>CSS注釋</H2><P>為了方便你自己或者他人日后更好地理解你的CSS代碼，你可以寫CSS代碼注釋。CSS代碼注釋以/*開頭，以*/結(jié)束。</P><PRE>/* 段落樣式 */</PRE><PRE>p</PRE><PRE>{</PRE><PRE>text-align: center;</PRE><PRE>/* 居中顯示 */</PRE><PRE>color: black;</PRE><PRE>font-family: arial</PRE><PRE>} </PRE><P> </P>
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