使用Angular 8 Map @agm关闭以前的infoWindow

如何解决使用Angular 8 Map @agm关闭以前的infoWindow

我在用Angular 8和@agm关闭上面的infoWindow时遇到问题，现在在打开每个窗口时它总是累积，只有在从每个窗口中按X时才能关闭它。

HTML

    <agm-map
      (mapClick)="close_Window($event)"
      [fullscreenControl]="allowFullScreen"
      [zoom]="zoom"
      (mapReady)="onMapReady($event)"
    >
      <agm-marker
        *ngFor="let poi of stores"
        (markerClick)="clicked_Marker(infoWindow)"
        [openInfoWindow]="enableAgmWindow"
      >
        <ng-container *ngIf="enableAgmWindow">
          <agm-info-window #infoWindow>
            <div class="agm-card__body">
              <ng-template *ngTemplateOutlet="agmWindowContainer.template || noTemplate; context: { $implicit: poi }">
              </ng-template>
              <ng-template #noTemplate let-value></ng-template>
              <div class="agm-card__footer"></div>
            </div>
          </agm-info-window>
        </ng-container>
      </agm-marker>
    </agm-map>

ts

  @ViewChild(AgmInfoWindow,{ static: false }) infoWindow;
  prevIoUs_info_window: AgmInfoWindow = null;

  close_Window() {
    if (this.prevIoUs_info_window != null) {
      this.prevIoUs_info_window.close();
    }
  }

  clicked_Marker(infoWindow: AgmInfoWindow,index: number) {
    //Close prevIoUs window

    if (this.prevIoUs_info_window == null) {
      this.prevIoUs_info_window = infoWindow;
    } else {
      this.prevIoUs_info_window.close();
    }

    this.prevIoUs_info_window = infoWindow;
  }

我该怎么办？谢谢