CSS使用border边框制作各种各样的三角形，源代码如下：

<!doctype html>
<html lang=\"en\">
<head>
	<  charset=\"UTF-8\">
	< >读取本地文件</ >
	
	<style type=\"text/css\">
		body{
	margin:0;
}

#container{
	width:1000px;
	margin:50px auto;
}
#controller{
	width:400px;
	height: auto;
	float: left;
	border: 2px solid #D4D4D4;
	padding:10px;
}
dl{
	height: 60px;
}
dt{
	margin-bottom: 10px;
	font-weight: bold;
	display: inline-block;
	float: left;
	margin-right: 10px;
}
dd{
	float: left;
	padding-left: 0;
	margin-left:10px;
	position: relative;
	top:-12px;
}

.radios{
	display:inline-block;
	padding:5px 8px;
	background:#FFF;
	border:2px solid #D4D4D4;
	cursor:pointer;
	margin-right: 5px;
	margin-top:5px;
	min-width:70px;
	text-align:center;
}

.radios.current,.radios:hover,.radios.current:hover{
	border:2px solid #3B94C7;
	color:#3B94C7;
	background:#EEEEEE;
	position: relative;
}
.radios:hover{
	border-color: #D4D4D4;
}
.radios.current:before{
	content :\'\';
	width:0;
	height:0;
	position:absolute;
	left:-1px;
	top:-1px;
	border-left:10px solid #3B94C7;
	border-bottom:10px solid rgba(0,0,0,0);
	border-right:none;
}
.radios.current:after{
	content :\'\';
	width:0;
	height:0;
	position:absolute;
	right:0;
	bottom:0;
	border-right:4px solid #3B94C7;
	border-bottom:4px solid #3B94C7;
	border-left:4px solid rgba(0,0,0,0);
	border-top:4px solid rgba(0,0,0,0);
}


#box{
	float: left;
	margin-left: 200px;
	margin-top:100px;
}
#tipwapper{
	border:1px solid #EEEEEE;
	position: relative;
	width:100px;
	height: 100px;
}
#tip{
	display: inline-block;
	width:0;
	height: 0;
	border:50px solid #3B94C7;
	position: absolute;
}

textarea{
	width:350px;
	height: 150px;
	resize:none;
	border:2px solid #D4D4D4;
	padding:10px;
}
h1{
	color: #DD5500;
	font-family: \"Microsoft Yahei\"
}
	</style>
	<  id=\"jquery_183\" type=\"text/ \" class=\"library\" src=\"/js/sandbox/jquery/jquery-1.8.3.min.js\"></ >
</head>
<body>
<div id=\"container\">
		<h1>通过CSS边框画三角形</h1>
		<div id=\"controller\">
			<dl>
				<dt>左边框</dt>
				<dd class=\"radios radio1\" data-id=\"1\">透明边框</dd>
				<dd class=\"radios radio1\" data-id=\"2\">无边框</dd>
				<dd class=\"radios radio1 current\" data-id=\"3\">有边框</dd>
				<dd><input type=\"hidden\" id=\"left\" value=\"3\"/></dd>
			</dl>
			<dl>
				<dt>上边框</dt>
				<dd class=\"radios radio2\"  data-id=\"1\">透明边框</dd>
				<dd class=\"radios radio2\"  data-id=\"2\">无边框</dd>
				<dd class=\"radios radio2 current\"  data-id=\"3\">有边框</dd>
				<dd><input type=\"hidden\" id=\"top\" value=\"3\"/></dd>
			</dl>
			<dl>
				<dt>右边框</dt>
				<dd class=\"radios radio3\"  data-id=\"1\">透明边框</dd>
				<dd class=\"radios radio3\"  data-id=\"2\">无边框</dd>
				<dd class=\"radios radio3 current\"  data-id=\"3\">有边框</dd>
				<dd><input type=\"hidden\" id=\"right\" value=\"3\"/></dd>
			</dl>
			<dl>
				<dt>下边框</dt>
				<dd class=\"radios radio4\"  data-id=\"1\">透明边框</dd>
				<dd class=\"radios radio4\"  data-id=\"2\">无边框</dd>
				<dd class=\"radios radio4 current\"  data-id=\"3\">有边框</dd>
				<dd><input type=\"hidden\" id=\"bottom\" value=\"3\"/></dd>
			</dl>

			<textarea id=\"input\" readonly></textarea>
		</div>
		<div id=\"box\">
			<div id=\"tipwapper\">
				<div id=\"tip\"></div>
			</div>
			
		</div>
	</div>

	
	
	<  type=\"text/ \">

		$(\".radios\").each(function(){
				$(this).click(function(){
					// if($(this).hasClass(\"current\")){
					// 	$(this).removeClass(\"current\");
					// 	callback(null);
					// 	return;
					// }
					$(this).parent().find(\".radios\").removeClass(\"current\");
					$(this).addClass(\"current\");
					$(this).parent().find(\"input\").val($(this).data(\"id\"));
					change();
				});
			});

			function change(){
				var color = \"50px solid #3B94C7\";
				var transparent = \"50px solid rgba(0,0,0,0)\";
				var leftVal = $(\"#left\").val();
				var input = \"\";
				var leftBorder = \"\";
				if(leftVal==1){
					leftBorder = transparent;
				}
				else if(leftVal==2){
					leftBorder = \"none\";
				}
				else if(leftVal==3){
					leftBorder = color;
				}
				$(\"#tip\").css(\"border-left\",leftBorder);
				input += \"border-left:\"+ leftBorder + \"\\n\";


				var topVal = $(\"#top\").val();
				var topBorder = \"\";
				if(topVal==1){
					topBorder = transparent;
				}
				else if(topVal==2){
					topBorder = \"none\";
				}
				else if(topVal==3){
					topBorder = color;
				}
				$(\"#tip\").css(\"border-top\",topBorder);
				input += \"border-top:\"+ topBorder + \"\\n\";


				var rightVal = $(\"#right\").val();
				var rightBorder = \"\";
				if(rightVal==1){
					rightBorder = transparent;
				}
				else if(rightVal==2){
					rightBorder = \"none\";
				}
				else if(rightVal==3){
					rightBorder = color;
				}
				$(\"#tip\").css(\"border-right\",rightBorder);
				input += \"border-right:\"+ rightBorder + \"\\n\";



				var bottomVal = $(\"#bottom\").val();
				var bottomBorder = \"\";
				if(bottomVal==1){
					bottomBorder = transparent;
				}
				else if(bottomVal==2){
					bottomBorder = \"none\";
				}
				else if(bottomVal==3){
					bottomBorder = color;
				}
				$(\"#tip\").css(\"border-bottom\",bottomBorder);
				input += \"border-bottom:\"+ bottomBorder + \"\\n\";


				$(\"#input\").val(input);
			}
			change();
	</ >
</body>
</html>

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