如何计算三个或四个经纬点之间的距离？(哈维正弦公式)

a = sin²(Δlat/2) + cos(lat1) * cos(lat2) * sin²(Δlon/2)
c = 2 * atan2(√a, √(1-a))
d = R * c

function calculateDistance(lat1, lon1, lat2, lon2) {
  const R = 6371; // 地球半径，单位为公里
  const dLat = toRadians(lat2 - lat1);
  const dLon = toRadians(lon2 - lon1);

  const a = Math.sin(dLat/2) * Math.sin(dLat/2) +
            Math.cos(toRadians(lat1)) * Math.cos(toRadians(lat2)) *
            Math.sin(dLon/2) * Math.sin(dLon/2);
  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
  const distance = R * c;

  return distance;
}

function toRadians(degrees) {
  return degrees * Math.PI / 180;
}

// 示例数据
const lat1 = 40.7128; // 纽约市的纬度
const lon1 = -74.0060; // 纽约市的经度
const lat2 = 34.0522; // 洛杉矶的纬度
const lon2 = -118.2437; // 洛杉矶的经度

const distance = calculateDistance(lat1, lon1, lat2, lon2);
console.log(distance); // 输出两地之间的距离，单位为公里