版本：3.1.0
- https://cdn.bootcdn.net/ajax/libs/font-awesome/3.1.0/css/font-awesome-ie7.css
- https://cdn.bootcdn.net/ajax/libs/font-awesome/3.1.0/css/font-awesome-ie7.min.css
- https://cdn.bootcdn.net/ajax/libs/font-awesome/3.1.0/css/font-awesome.css
- https://cdn.bootcdn.net/ajax/libs/font-awesome/3.1.0/css/font-awesome.min.css
- https://cdn.bootcdn.net/ajax/libs/font-awesome/3.1.0/font/fontawesome-webfont.svg