1、Div的宽高为100
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
div
{
border-color: green blue red black;
border-style: solid;
border-width: 16px;
height: 100px;
width: 100px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
显示效果：
2、将宽高均设置为0
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
div
{
border-color: green blue red black;
border-style: solid;
border-width: 80px;
height: 0px;
width: 0px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
显示效果：
3、只显示下面的▲
半透明示意
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
div
{
border-color: rgba(0,100,100,0.1) rgba(20,20,20,0.1) red;
border-style: solid;
border-width: 80px;
height: 0px;
width: 0px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
显示效果：
设置为全透明
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
div
{
border-color: rgba(0,0,0,0) rgba(0,0,0,0) red;
border-style: solid;
border-width: 80px;
height: 0px;
width: 0px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
显示效果：
4、通过2个▲的重叠实现导航示意符号Λ
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
div.one
{
border-color: rgba(0,0,0,0) rgba(0,0,0,0) red;/*这里为导航符号颜色*/
border-style: solid;
border-width: 80px;
height: 0px;
width: 0px;
position:absolute;
}
div.two
{
border-color: rgba(0,0,0,0) rgba(0,0,0,0) white;/*这里为背景色*/
border-style: solid;
border-width: 80px;
height: 0px;
width: 0px;
position:absolute;
margin-top:4px;/*需要一个偏移量*/
}
</style>
</head>
<body>
<div class="one"></div>
<div class="two"></div>
</body>
</html>
显示效果：
5、与下方的DIV组合
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
div.one
{
border-color: rgba(0,0,0,0) rgba(0,0,0,0) red;
border-style: solid;
border-width: 80px;
height: 0px;
width: 0px;
position:absolute;
}
div.two
{
border-color: rgba(0,0,0,0) rgba(0,0,0,0) black;/*black不是背景色，便于观察*/
border-style: solid;
border-width: 80px;
height: 0px;
width: 0px;
position:absolute;
margin-top:2px;
z-index:1;
}
div.three{
position:absolute;
width:400px;
height:100px;
border:2px solid red;/*需要设置边界宽度*/
margin-top:158px
}
</style>
</head>
<body> <div class="one"></div>
<div class="two"></div>
<div class="three"></div> </body>
</html>
便于观察的黑色背景：
改为背景色"白色"后显示效果：
6、完整的小例子
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style>
*
{
margin: 0px;
padding: 0px;
} #show
{
margin: 10px auto;
position: absolute;
top: 50px;
left: 50px;
text-align: center;
} #some
{
width: 200px;
margin-left: 100px;
text-align: center;
position: absolute;
background-color: rgba(255, 0, 0,0.6);
border-radius: 5px;
} #info
{
width: 400px;
height: 300px;
position: absolute;
} #outarrow
{
border-color: transparent transparent #efefef;
border-style: solid;
border-width: 16px;
height: 0;
width: 0;
position: absolute;
top: 0px;
left: 184px;
} #innerarrow
{
border-color: transparent transparent white;
border-style: solid;
border-width: 16px;
height: 0;
width: 0;
position: absolute;
top: 0px;
left: 184px;
margin-top: 6px;
} #content
{
border: 4px solid;
border-radius: 4px;
border-color: #efefef;
width: 400px;
margin: 32px auto 0px;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
box-sizing: border-box;
} #content p
{
text-align: left;
text-indent: 20px;
}
</style> </head>
<body>
<div id="show">
<div id="some">下面就是箭头效果</div>
<div id="info">
<div id="outarrow"></div>
<div id="innerarrow"></div>
<div id="content">
<h1>使用边界产生箭头</h1>
<p>要点1：设置盒子的宽高均为0，只设置边界宽度</p>
<p>要点2：可以通过border-style改变效果</p>
</div>
</div>
</div>
</body>
</html>
显示效果：
7、改变border-style 有趣的效果
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
div
{
border-color: green blue red black;
border-style: dotted;/*除了solid，可以试试dotted,dashed;grooved等*/
border-width: 80px;
height: 0px;
width: 0px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
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dotted |
dashed | groove |
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outset |
inset | ridge |
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