The Google map Direction Service Api has two "side effects",
1- it adds Markers automatically to origin and destination.
2- it adds two InfoWindow to the new Markers, containing their addresses.
Any idea how to get rid of theese Markers and their infoBubble?
Add suppressMarkers: true to the DirectionsRendererOptions
suppressMarkers | boolean |Suppress the rendering of markers.
来源：https://stackoverflow.com/questions/18033713/how-to-get-rid-of-google-map-direction-services-markers