Leaflet JS add GeoJSON shape as a hole in a polygon（外多边形内有内多边形）

• 参考

https://gis.stackexchange.com/questions/150801/leaflet-js-add-geojson-shape-as-a-hole-in-a-polygon

http://leaflet.github.io/Leaflet.Editable/example/create-hole-on-click.html

https://lbs.amap.com/api/javascript-api/example/overlayers/draw-polygon-with-holes

https://stackoverflow.com/questions/43645172/geojson-multipolygon-with-multiple-holes

• 数据结构

var scotland = L.polygon([ [[60,-13],[60,0],[50,4],[50,-13]],
                           [[55.7,-4.5],[56,-4.5],[56,-4],[55.7,-4]]
                         ]);
scotland.addTo(map);