一、发现
前端渣哥逛博客园，经常看到博文评论有这种如下这种效果：
开始还以为是用图片实现的，额...。像博客园这种访问量大的网站，能用js/css实现的就不会用图片代替，果然，仔细一看，两个span就能实现这个效果了。
二、实现
看到不会或者不清楚的，总想探个究竟，并把知识变成自己的。接下来就花点时间，实现这种效果。
2.1 以span 设置 border-width:20px; 为例，这样相当于一个 40*40 的正方形（上下(20*2)和左右(20*2)），然后平分成4份，怎么平分呢，上下左右4个全等三角型就是了。既然这样，我们就可以轻松实现以下效果了：
2.2 有了上面的做法，我们同样可以再用一个span，实现如下效果：
这样，把浅蓝色部分换成白色，就可以实现遮挡，再通过绝对定位，就可以实现我们想要的效果了。
2.3 完整代码
<!DOCTYPE><html><head> <title>css实现博客园回复效果</title> <style type="text/css"> *{margin:0;padding:0;} #reply{ width:600px; margin:0 auto; } .reply_item{ padding:10px 20px; border-bottom:1px solid #EDD98B; } .reply_img{ float:left; } .reply_img a{ float:left; margin-top:20px; text-decoration:none; color:#fff; } .reply_img img{ width:60px; height:60px; border-radius:40px; } .reply_content{ margin-left:110px; background:#beceeb; padding:30px 20px; border-radius:18px; position:relative; } .dot{ border-style:solid; border-width:20px; border-color:#fff #beceeb #beceeb #fff; position:absolute; left:-40px; top:40px; } .top{ border-style:solid; border-width:10px 20px; border-color:transparent #fff #fff transparent; position:absolute; left:-40px; top:60px; } </style></head><body> <div id="reply"> <div class="reply_item"> <div class="reply_img"> <a href="http://www.cnblogs.com"> <img src="/static/imghwm/default1.png" data-src="1.jpg" class="lazy" alt="用户头像" /> </a> </div> <div class="reply_content"> 好文，要攒 <div class="dot"></div> <div class="top"></div> </div> </div> </div></body></html> 2.4 效果图：
三、总结
一个简单的demo，以此小记。代码不自己敲就不是你的，有空逛逛园子总会有收获。
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