各大厂商坐标系转换js版

let pi = 3.1415926535897932384626;
let x_pi = 3.14159265358979324 * 3000.0 / 180.0;
let a = 6378245.0;
let ee = 0.00669342162296594323;
class LngLonUtil {
    static transformLat(x, y) {
        let 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 * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    static transformLon(x, y) {
        let 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 * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }

    /**
     * @param lon 经度
     * @param lat 纬度
     * @return
     */
    static transformCommon(lon, lat) {
        if (LngLonUtil.outOfChina(lon, lat)) {
            return [lon, lat];
        }
        let dLat = LngLonUtil.transformLat(lon - 105.0, lat - 35.0);
        let dLon = LngLonUtil.transformLon(lon - 105.0, lat - 35.0);
        let radLat = lat / 180.0 * pi;
        let magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        let sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        let mgLat = lat + dLat;
        let mgLon = lon + dLon;
        return [mgLon, mgLat];
    }


    /**
     * 84 ==》 高德
     *
     * @param lon 经度
     * @param lat 纬度
     * @return
     */
    static gps84_To_Gcj02(lon, lat) {
        if (LngLonUtil.outOfChina(lon, lat)) {
            return [lat, lon];
        }
        let dLat = LngLonUtil.transformLat(lon - 105.0, lat - 35.0);
        let dLon = LngLonUtil.transformLon(lon - 105.0, lat - 35.0);
        let radLat = lat / 180.0 * pi;
        let magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        let sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        let mgLat = lat + dLat;
        let mgLon = lon + dLon;
        return [mgLon, mgLat];
    }

    /**
     * 高德 ==》 84
     *
     * @param lon 经度
     * @param lat 纬度
     * @return
     */
    static gcj02_To_Gps84(lon, lat) {
        let gps = LngLonUtil.transformCommon(lon, lat);
        let longitude = lon * 2 - gps[0];
        let latitude = lat * 2 - gps[1];
        return [longitude, latitude];
    }







    /**
     * 判断是否在中国
     *
     * @param lon 经度
     * @param lat 纬度
     * @return
     */
    static outOfChina(lon, lat) {
        if (lon < 72.004 || lon > 137.8347 || lat < 0.8293 || lat > 55.8271) {
            return true;
        }
        return false;
    }
}