应答器调整

src/graphics/transponder/Transponder.ts

@@ -105,6 +105,9 @@ export class Transponder extends JlGraphic {
   get datas(): ITransponderData {
     return this.getDatas<ITransponderData>();
   }
+  get code(): string {
+    return this.datas.index + '';
+  }
   clear() {
     this.polygonGraphic.clear();
     this.labelGraphic.clear();