https://css-tricks.com/triangle-breadcrumbs/
http://exisweb.net/incredibly-useful-list-of-responsive-navigation-and-menu-patterns
http://cssmenumaker.com/responsive-menus
http://line25.com/tutorials/how-to-create-flat-style-breadcrumb-links-with-css
http://www.hongkiat.com/blog/breadcrumb-menu-css3/
原文：http://www.cnblogs.com/zyip/p/4315657.html