今天其实收货很大的
1、InfoWindow
google.maps.InfoWindow class
An overlay that looks like a bubble and is often connected to a marker.
2、MarkerManager v3
MarkerManager v3
Marker manager is an interface between the map and the user, designed to manage adding and removing many points when the viewport changes.
addMarker()
3、setAnimation
这是google.maps.Marker 的一个方法，用于给Marker添加动作的。
