new SketchTopologyTool() sketchEditor/base/SketchTopologyTool.js, line 2 草图拓扑分析类 Methods unionPolygons(polygons){Polygon} sketchEditor/base/SketchTopologyTool.js, line 16 合并多个区几何图形 Name Type Description polygons Array 被合并的区对象 Returns: Type Description Polygon 合并后的区对象