Coordinate conversion WGS-84 to gcj-02 and gcj-02 to WGS-84

  /*//WGS-84 to GCJ-02*/
  static wgs_gcj(lng, lat){
    if (this.out_of_china(lng, lat)) {
      return [lng, lat];
    }else{
      var a = 6378245.0; //  a:  The projection factor of the satellite ellipsoid coordinate projected to the plane map coordinate system .
      var ee = 0.00669342162296594323; //  ee:  Eccentricity of ellipsoid .
      var dlat = this.transformlat(lng - 105.0, lat - 35.0);
      var dlng = this.transformlng(lng - 105.0, lat - 35.0);
      var radlat = lat / 180.0 * PI;
      var magic = Math.sin(radlat);
      magic = 1 - ee * magic * magic;
      var sqrtmagic = Math.sqrt(magic);
      dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * PI);
      dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
      var mglat = lat + dlat;
      var mglng = lng + dlng;
      return {j:mglng, w:mglat};
    }
  }

//gcj-02 turn wgs84
  static gcj_wgs(lng, lat){
    if (this.out_of_china(lng, lat)) {
      return [lng, lat];
    }
    else {
      var a = 6378245.0; //  a:  The projection factor of the satellite ellipsoid coordinate projected to the plane map coordinate system .
      var ee = 0.00669342162296594323; //  ee:  Eccentricity of ellipsoid .
      var dlat = this.transformlat(lng - 105.0, lat - 35.0);
      var dlng = this.transformlng(lng - 105.0, lat - 35.0);
      var radlat = lat / 180.0 * PI;
      var magic = Math.sin(radlat);
      magic = 1 - ee * magic * magic;
      var sqrtmagic = Math.sqrt(magic);
      dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * PI);
      dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
      var mglat = lat + dlat;
      var mglng = lng + dlng;
      return {j:lng * 2 - mglng, w:lat * 2 - mglat};
    }
  }