CSS使用border边框制作各种各样的三角形

时间:2017-03-31
css border用于设置html元素的边框样式，除了设置元素的边框外，CSS使用border还可以制作出各种各样的三角形，本文章向大家分享CSS使用border边框制作三角形的源代码，需要的朋友可以参考一下。

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>
	<meta charset="UTF-8">
	<title>读取本地文件</title>
	
	<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>
	<script id="jquery_183" type="text/javascript" class="library" src="/js/sandbox/jquery/jquery-1.8.3.min.js"></script>
</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>

	
	
	<script type="text/javascript">

		$(".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();
	</script>
</body>
</html>

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