从远程服务器获取到了原始真实坐标，使用算法将wgs84坐标转换成gcj02坐标，再地图上显示时与实际位置误差很大，但同样的真实坐标转换成百度BD-09坐标系在android下百度地图显示就非常准确，请问微信小程序设置Marker经纬度时使用的什么坐标系？谢谢。

以下是转换方法：

class GPSTransformWX {

  constructor(param) {

    //  this.ak = param["ak"];

  }

   transform (wgLat, wgLon) {

     var a = 6378245.0;

     var ee = 0.00669342162296594323;

    if (this.outOfChina(wgLat, wgLon)) {

      return [wgLat, wgLon];

    }

    var dLat = this.transformLat(wgLon - 105.0, wgLat - 35.0);

    var dLon = this.transformLon(wgLon - 105.0, wgLat - 35.0);

    var radLat = wgLat / 180.0 * Math.PI;

    var magic = Math.sin(radLat);

    var magic = 1 - ee * magic * magic;

    var sqrtMagic = Math.sqrt(magic);

    dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * Math.PI);

    dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * Math.PI);

    var mgLat = Number(wgLat) + Number(dLat);

    var mgLon = Number(wgLon) + Number(dLon);

    console.log("纬度"+dLat + "**" + wgLat + " ****" + mgLat);

    console.log("经度"+dLon + "**" + wgLon + " ****" + mgLon);

    return [mgLat, mgLon];

  }

  outOfChina (lat, lon) {

    if (lon < 72.004 || lon > 137.8347)

      return true;

    if (lat < 0.8293 || lat > 55.8271)

      return true;

    return false;

  }

 transformLat  (x, y) {

   console.log("x="+x+" y="+y);

    var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));

    ret += (20.0 * Math.sin(6.0 * x * Math.PI) + 20.0 * Math.sin(2.0 * x * Math.PI)) * 2.0 / 3.0;

    ret += (20.0 * Math.sin(y * Math.PI) + 40.0 * Math.sin(y / 3.0 * Math.PI)) * 2.0 / 3.0;

    ret += (160.0 * Math.sin(y / 12.0 * Math.PI) + 320 * Math.sin(y * Math.PI / 30.0)) * 2.0 / 3.0;

    return ret;

  };

transformLon (x, y) {

    var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));

    ret += (20.0 * Math.sin(6.0 * x * Math.PI) + 20.0 * Math.sin(2.0 * x * Math.PI)) * 2.0 / 3.0;

    ret += (20.0 * Math.sin(x * Math.PI) + 40.0 * Math.sin(x / 3.0 * Math.PI)) * 2.0 / 3.0;

    ret += (150.0 * Math.sin(x / 12.0 * Math.PI) + 300.0 * Math.sin(x / 30.0 * Math.PI)) * 2.0 / 3.0;

    return ret;

  };

}

module.exports.GPSTransformWX = GPSTransformWX;