有什么简单的方法可以清除Google Maps v3 API上的所有标记，折线和其他叠加层?
问题描述：
我想获取不使用刷新网页的新地图.
I want to get a new map not using refush the webpage.
谢谢
有简单的方法在地图上获取所有叠加层吗?
and has easy way to get all Overlays on the map?
答
在v2 API中，存在 Gaby指出了.但是，如果使用v3 API，则不存在此方法.如果我没记错的话，这种遗漏是为了使库保持轻量级.
In the v2 API, there was the clearOverlays() method as Gaby pointed out. However, this method is not present if the v3 API. If I remember correctly, this omission was intentional to keep the library lightweight.
因此，使用v3 API，您必须保留叠加层的引用，然后在每个叠加层上调用setMap(null).
Therefore, with the v3 API, you have to keep a reference of your overlays, and then call setMap(null) on each overlay.