增加默认参数

src/app/working-area/working-area.component.ts

@@ -1018,7 +1018,7 @@ export class WorkingAreaComponent extends EventEmitter implements OnInit, AfterV
   /**
    * 刷新背景图
    */
-  public async refreshBackgroundImage(imageUrl: string, imageAngle: number): Promise<void> {
+  public async refreshBackgroundImage(imageUrl: string = this.canvasData.selectStorey.imageUrl, imageAngle: number = this.canvasData.selectStorey.imageAngle): Promise<void> {
     if (imageAngle === undefined || imageAngle === null) {
       imageAngle = 0;
     }