经纬度距离

复制import math

# 地球平均半径（千米）
R = 6371.0

def haversine(lat1, lon1, lat2, lon2):
    # 将角度转换为弧度
    phi1, phi2 = math.radians(lat1), math.radians(lat2)
    dphi = math.radians(lat2 - lat1)
    dlambda = math.radians(lon2 - lon1)

    a = math.sin(dphi / 2) ** 2 + math.cos(phi1) * math.cos(phi2) * math.sin(dlambda / 2) ** 2
    c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a))

    return R * c

# 示例：北京（39.9042, 116.4074）→ 上海（31.2304, 121.4737）
dist = haversine(39.9042, 116.4074, 31.2304, 121.4737)
print(f"{dist:.2f} km")  # 约 1067.88 km

复制package main

import (
	"fmt"
	"math"
)

const R = 6371.0 // 地球半径（千米）

func haversine(lat1, lon1, lat2, lon2 float64) float64 {
	phi1 := lat1 * math.Pi / 180
	phi2 := lat2 * math.Pi / 180
	dphi := (lat2 - lat1) * math.Pi / 180
	dlambda := (lon2 - lon1) * math.Pi / 180

	a := math.Sin(dphi/2)*math.Sin(dphi/2) +
		math.Cos(phi1)*math.Cos(phi2)*
			math.Sin(dlambda/2)*math.Sin(dlambda/2)
	c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))

	return R * c
}

func main() {
	// 北京 → 上海
	dist := haversine(39.9042, 116.4074, 31.2304, 121.4737)
	fmt.Printf("%.2f km\n", dist) // 约 1067.88 km
}

复制const R = 6371; // 地球半径（千米）

function haversine(lat1, lon1, lat2, lon2) {
  const toRad = (deg) => (deg * Math.PI) / 180;

  const phi1 = toRad(lat1);
  const phi2 = toRad(lat2);
  const dphi = toRad(lat2 - lat1);
  const dlambda = toRad(lon2 - lon1);

  const a =
    Math.sin(dphi / 2) ** 2 +
    Math.cos(phi1) * Math.cos(phi2) * Math.sin(dlambda / 2) ** 2;
  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));

  return R * c;
}

// 北京 → 上海
const dist = haversine(39.9042, 116.4074, 31.2304, 121.4737);
console.log(`${dist.toFixed(2)} km`); // 约 1067.88 km