js 获取多个经纬度中心点

高德地图上高亮多个品牌位置，地图界面需要初始化在中心点，没找到配置项，遂自己算

// js 获取多个经纬度中心点
getCenterPoint(geoCoordinateList) {
  const geoCoordinateListFlat = geoCoordinateList.reduce((s, v) => {
    return (s = s.concat(v))
  }, [])
  const total = geoCoordinateListFlat.length
  let X = 0
  let Y = 0
  let Z = 0
  for (const g of geoCoordinateListFlat) {
    const lat = g.lat * Math.PI / 180
    const lon = g.lng * Math.PI / 180
    const x = Math.cos(lat) * Math.cos(lon)
    const y = Math.cos(lat) * Math.sin(lon)
    const z = Math.sin(lat)
    X += x
    Y += y
    Z += z
  }

  X = X / total
  Y = Y / total
  Z = Z / total
  const Lon = Math.atan2(Y, X)
  const Hyp = Math.sqrt(X * X + Y * Y)
  const Lat = Math.atan2(Z, Hyp)

  return { lng: Lon * 180 / Math.PI, lat: Lat * 180 / Math.PI }
}