最終效果：
源碼：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHtml 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<Html XMLns="http://www.w3.org/1999/xhtml">
<head>
<title>學電腦,我只上智可網 www.hzhike.com</title>
<meta http-equiv="Content-Type" content="text/Html; charset=utf-8" />
<style>
/*zishu.cn*/
*{ margin:0; padding:0; font-size:12px; font-family:Verdana, "宋體", Arial; line-height:1.8; list-style:none;}
#info,#nav{ margin:50px; border:1px dashed #FF3300; background:#FFFFCC; padding:50px;}
#info div{background:#FF0000; width:0px; height:0px; overflow:hidden; margin-bottom:10px;}
/*一些三角的寫法*/
#com_a{ border-top:10px solid #FFFFCC;border-left:10px solid #FF3300;border-bottom:10px solid #FFFFCC;}
#com_b{ border-top:10px solid #FFFFCC;border-right:10px solid #FF3300;border-bottom:10px solid #FFFFCC;}
#com_c{ border-top:10px solid #FFFFCC;border-right:10px solid #FF3300;border-bottom:10px solid #FFFFCC;border-left:10px solid #FF3300;}
#com_d{ border-top:10px solid #FF3300;border-right:10px solid #FFFFCC;border-bottom:10px solid #FF3300;border-left:10px solid #FFFFCC;}
#com_e{ border-top:10px solid #FFFFCC;border-left:10px solid #FF3300;}
#com_f{ border-top:10px solid #FF3300;border-right:10px solid #FFFFCC;border-left:10px solid #FFFFCC;}
#com_g{ border-right:10px solid #FFFFCC;border-bottom:10px solid #FF3300;border-left:10px solid #FFFFCC;}
#com_h{ border-top:10px solid #FF3300;border-bottom:10px solid #FF3300;border-left:10px solid #FFFFCC;}
#com_i{ border-top:10px solid #FF3300;border-right:10px solid #FF3300;border-bottom:10px solid #FF3300;border-left:10px solid #FFFFCC;}
</style>
</head>
<body>
<div id="info">
<h1>一些三角形的寫法</h1>
<div id="com_a"></div>
<div id="com_b"></div>
<div id="com_f"></div>
<div id="com_g"></div>
<div id="com_c"></div>
<div id="com_d"></div>
<div id="com_e"></div>
<div id="com_h"></div>
<div id="com_i"></div>
</div>
</body>
</Html>
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