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