code: function decodeWildGeoObject(geoDogObj) {
    if (geoDogObj !== null && geoDogObj.hasOwnProperty("l") && Array.isArray(geoDogObj.l) && geoDogObj.l.length === 2) {
      return geoDogObj.l;
    } else {
      throw new Error("Unexpected WildGeo location object encountered: " + JSON.stringify(geoDogObj));
    }
  }
docs: 把WildGeo解码，解码失败返回null
  @param {Object} geoDogObj 包含地理坐标信息的WildGeo对象
  @return {?Array.<number>} location [latitude, longitude]坐标数组，如果解码失败，返回null