CSS实现的带有箭头的矩形效果实例代码_html/css_WEB-ITnose

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Release: 2016-06-24 11:31:10
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CSS实现的带有箭头的矩形效果实例代码:
带有箭头的矩形效果现在应用非常的广泛,例如危险的信息是带有箭头矩形效果,当然它们的实现原理和咱们是不一样的,在网页中当然也有这样的应用,例如弹出信息提示说明,可以用箭头用来作为方位提示,下面就用实例代码简单介绍一下。
代码实例如下:

 

<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta name="author" content="http://www.softwhy.com/" /><title>三种纯CSS实现三角形的方法</title> <style type="text/css"> .message-box  {   position:relative;   width:240px;   height:60px;   line-height:60px;   border:1px solid #000;   text-align:center;   color:#0C7823; } .triangle-border  {   position:absolute;   left:100px;   overflow:hidden;   width:0;   height:0;   border-width:10px;   border-style:none dashed solid dashed; } .tb-border  {   top:-10px;   border-color:#000 transparent #000 transparent; } .tb-background  {   top:-9px;   border-color:transparent transparent #fff transparent; }</style> </head> <body> <div class="message-box">  <span>border属性实现</span>   <div class="triangle-border tb-border"></div>   <div class="triangle-border tb-background"></div> </div>  </body> </html>
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以上代码实现了带有箭头的矩形效果,下面介绍一下此效果的实现过程。
一.实现原理:
原理很简单,就是设置两个div的边框,然后让这个两个div重合,并且给它们使用top属性值,相差1px,这样露出来的就是三角形的轮廓,为了更容易理解此效果,先看一段代码:

<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><style type="text/css">div {  width:0px;  height:0px;  border-bottom:50px solid green;  border-left:50px solid blue;  border-right:50px solid red;  border-top:none;}</style></head><body><div></div></body></html>
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上面的绿色三角形就是我们要显示的三角形效果,但是我们要的是细线边框的三角形,所以再用一个这样的三角形来和它重叠,然后利用定位差,实现边框效果。原理大体如此,当然覆盖在它上面的三角形背景是白色的。

原文地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=9801

更多内容可以参阅:http://www.softwhy.com/divcss/

 

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