http://v3.bootcss.com/css/#forms
http://www.ziqiangxuetang.com/bootstrap/bootstrap-forms.html
另附加fa字体文件在线api：
http://fontawesome.dashgame.com/
bootstrap字体图标文档：
http://www.runoob.com/bootstrap/bootstrap-glyphicons.html
bootstrap教程：
http://www.runoob.com/bootstrap/bootstrap-tutorial.html
bootstrap优站精选：
http://expo.bootcss.com/
bootstrap官方英文站：
http://getbootstrap.com/getting-started/#browsers