版本：1.5.1
- https://cdn.bootcdn.net/ajax/libs/leaflet.fullscreen/1.5.1/Control.FullScreen.css
- https://cdn.bootcdn.net/ajax/libs/leaflet.fullscreen/1.5.1/Control.FullScreen.js
- https://cdn.bootcdn.net/ajax/libs/leaflet.fullscreen/1.5.1/Control.FullScreen.min.js
- https://cdn.bootcdn.net/ajax/libs/leaflet.fullscreen/1.5.1/icon-fullscreen-2x.png
- https://cdn.bootcdn.net/ajax/libs/leaflet.fullscreen/1.5.1/icon-fullscreen.png