纯CSS实现小三角提示信息
实现后的效果如下:
不带边框的
带边框的
在此提供两种实现方式:
1、不带边框的
css:
- *{margin:0;padding:0;}
 - body{
 - background:#666;
 - font:14px/20px "Microsoft YaHei";
 - text-align: left;
 - }
 - .entry{
 - position: relative;
 - margin-left: 20px;
 - margin-top:20px;
 - width:200px;
 - background:#fff;
 - padding:10px;
 - /*设置圆角*/
 - -webkit-border-radius:5px;
 - -moz-border-radius:5px;
 - border-radius:5px;
 - }
 - /*左三角*/
 - .entry-trangle-left{
 - position:absolute;
 - bottom:15px;
 - left:-10px;
 - width:0;
 - height:0;
 - border-top:15px solid transparent;
 - border-bottom:15px solid transparent;
 - border-right:15px solid #fff;
 - }
 - /*右三角*/
 - .entry-trangle-right{
 - position:absolute;
 - top:15px;
 - right:-10px;
 - width:0;
 - height:0;
 - border-top:15px solid transparent;
 - border-bottom:15px solid transparent;
 - border-left:15px solid #fff;
 - }
 - /*上三角*/
 - .entry-trangle-top{
 - position:absolute;
 - top:-10px;
 - left:20px;
 - width:0;
 - height:0;
 - border-left:15px solid transparent;
 - border-right:15px solid transparent;
 - border-bottom:15px solid #fff;
 - }
 - /*下三角*/
 - .entry-trangle-bottom{
 - position:absolute;
 - bottom:-10px;
 - left:20px;
 - width:0;
 - height:0;
 - border-left:15px solid transparent;
 - border-right:15px solid transparent;
 - border-top:15px solid #fff;
 - }
 
html:
- <div class="entry">
 - <div class="entry-trangle-left"><!--本Div只来实现三角形,无其他作用--></div>
 - hello,我出生了<br/>
 - hello,我出生了
 - </div>
 - <div class="entry">
 - <div class="entry-trangle-right"><!--本Div只来实现三角形,无其他作用--></div>
 - hello,我出生了<br/>
 - hello,我出生了
 - </div>
 - <div class="entry">
 - <div class="entry-trangle-top"><!--本Div只来实现三角形,无其他作用--></div>
 - hello,我出生了<br/>
 - hello,我出生了
 - </div>
 - <div class="entry">
 - <div class="entry-trangle-bottom"><!--本Div只来实现三角形,无其他作用--></div>
 - hello,我出生了<br/>
 - hello,我出生了
 - </div>
 
2、带边框的
css:
- /*上三角*/
 - .tag-top{
 - margin: 20px;
 - padding: 5px;
 - width:300px;
 - height:60px;
 - border:2px solid #f99;
 - position:relative;
 - background-color:#FFF;
 - /*设置圆角*/
 - -webkit-border-radius:5px;
 - -moz-border-radius:5px;
 - border-radius:5px;
 - }
 - .tag-top:before,.tag-top:after{
 - content:"";
 - display:block;
 - border-width:15px;
 - position:absolute;
 - top:-30px;
 - left:100px;
 - border-style:solid dashed dashed solid;
 - border-color:transparent transparent #f99 transparent;
 - font-size:0;
 - line-height:0;
 - }
 - .tag-top:after{
 - top:-27px;
 - border-color: transparent transparent #FFF transparent;
 - }
 - /*下三角*/
 - .tag-bottom{
 - margin: 20px;
 - padding: 5px;
 - width:300px;
 - height:60px;
 - border:2px solid #f99;
 - position:relative;
 - background-color:#FFF;
 - /*设置圆角*/
 - -webkit-border-radius:5px;
 - -moz-border-radius:5px;
 - border-radius:5px;
 - }
 - .tag-bottom:before,.tag-bottom:after{
 - content:"";
 - display:block;
 - border-width:15px;
 - position:absolute;
 - bottom:-30px;
 - left:100px;
 - border-style:solid dashed dashed solid;
 - border-color:#f99 transparent transparent transparent;
 - font-size:0;
 - line-height:0;
 - }
 - .tag-bottom:after{
 - bottom:-27px;
 - border-color: #FFF transparent transparent transparent;
 - }
 - /*左三角*/
 - .tag-left{
 - margin: 20px;
 - padding: 5px;
 - width:300px;
 - height:60px;
 - border:2px solid #f99;
 - position:relative;
 - background-color:#FFF;
 - /*设置圆角*/
 - -webkit-border-radius:5px;
 - -moz-border-radius:5px;
 - border-radius:5px;
 - }
 - .tag-left:before,.tag-left:after{
 - content:"";
 - display:block;
 - border-width:15px;
 - position:absolute;
 - left:-30px;
 - top:20px;
 - border-style:dashed solid solid dashed;
 - border-color:transparent #f99 transparent transparent;
 - font-size:0;
 - line-height:0;
 - }
 - .tag-left:after{
 - left:-27px;
 - border-color:transparent #FFF transparent transparent ;
 - }
 - .tag-right{
 - margin: 20px;
 - padding: 5px;
 - width:300px;
 - height:60px;
 - border:2px solid #f99;
 - position:relative;
 - background-color:#FFF;
 - /*设置圆角*/
 - -webkit-border-radius:5px;
 - -moz-border-radius:5px;
 - border-radius:5px;
 - }
 - .tag-right:before,.tag-right:after{
 - content:"";
 - display:block;
 - border-width:15px;
 - position:absolute;
 - right:-30px;
 - top:20px;
 - border-style:dashed solid solid dashed;
 - border-color:transparent transparent transparent #f99;
 - font-size:0;
 - line-height:0;
 - }
 - .tag-right:after{
 - right:-27px;
 - border-color:transparent transparent transparent #FFF ;
 - }
 
html:
- <div class="tag-top">
 - css3气泡框
 - </div>
 - <div class="tag-bottom">
 - css3气泡框
 - </div>
 - <div class="tag-left">
 - css3气泡框
 - </div>
 - <div class="tag-right">
 - css3气泡框
 - </div>
 
此外,如若,设置边框的颜色与背景色相同,也能得到没有边框的:
css:
- .tag-right-noborder{
 - margin: 20px;
 - padding: 5px;
 - width:300px;
 - height:60px;
 - border:2px solid #FFF;
 - position:relative;
 - background-color:#FFF;
 - /*设置圆角*/
 - -webkit-border-radius:5px;
 - -moz-border-radius:5px;
 - border-radius:5px;
 - }
 - .tag-right-noborder:before,.tag-right-noborder:after{
 - content:"";
 - display:block;
 - border-width:15px;
 - position:absolute;
 - right:-30px;
 - top:20px;
 - border-style:dashed solid solid dashed;
 - border-color:transparent transparent transparent #FFF;
 - font-size:0;
 - line-height:0;
 - }
 - .tag-right-noborder:after{
 - right:-27px;
 - border-color:transparent transparent transparent #FFF ;
 - }
 
html:
- <div class="tag-right-noborder">
 - css3气泡框
 - </div>
 
实现后的效果:
                    
                
                
            
        
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