OverlappingMarkerSpiderfier

Deals with overlapping markers in Google Maps JS API v3, Google Earth-style.

https://cdnjs.webstatic.cn/ajax/libs/OverlappingMarkerSpiderfier/1.0.3/oms.js
https://cdnjs.webstatic.cn/ajax/libs/OverlappingMarkerSpiderfier/1.0.3/oms.min.js