摘要：
参考资料：前端观察：http://www.qianduan.net/compatible-all-browsers-css3-rounded-corners.htmlhttp://www.ruanyifeng.com/blog/2010/12/detailed_explanation_of_css3_rounded_corners.htmlcss各种形状：http://www.cnblogs.com/jshoukun/archive/2012/02/06/2340437.html 阅读全文
