code: function (scaleType) {
          var axes = [];
          var angleAxis = this._angleAxis;
          var radiusAxis = this._radiusAxis;
          angleAxis.scale.type === scaleType && axes.push(angleAxis);
          radiusAxis.scale.type === scaleType && axes.push(radiusAxis);
  
          return axes;
      }
docs: Get axes by type of scale
  @param {string} scaleType
  @return {module:echarts/coord/polar/AngleAxis|module:echarts/coord/polar/RadiusAxis}