计算两个经纬度之间的距离

结果为km

  // 获取两个经纬度之间的距离
  GetDistance = (lat1, lng1, lat2, lng2) => {
    var radLat1 = lat1 * Math.PI / 180.0;
    var radLat2 = lat2 * Math.PI / 180.0;
    var a = radLat1 - radLat2;
    var b = lng1 * Math.PI / 180.0 - lng2 * Math.PI / 180.0;
    var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) +
      Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)));
    s = s * 6378.137;//地球半径
    s = Math.round(s * 10000) / 10000;
    return s;
  }