Google Maps API v3同步计算距离和持续时间

Question

Is there any way to calculate distance and duration in google maps v3 synchronously ? I want to make a function which will take 2 parameter (latLng, latLng) and return the distance (not in straight line but through roads) between them (or the duration).

Answer 1

You don't need Google. You need the Haversine formula :

R = earth’s radius (mean radius = 6,371km)
Δlat = lat2 − lat1
Δlong = long2 − long1
a = sin²(Δlat/2) + cos(lat1) * cos(lat2) * sin²(Δlong/2)
c = 2 * atan2(√a, √(1−a))
d = R * c