ionic3 浏览器端返回

首屏component.ts文件中使用
setupBrowserBackButtonBehavior() {

    // Register browser back button action(s)
    window.onpopstate = (evt) => {

      // Close menu if open

      // Close any active modals or overlays
      let activePortal = this.ionicApp._loadingPortal.getActive() ||
        this.ionicApp._modalPortal.getActive() ||
        this.ionicApp._toastPortal.getActive() ||
        this.ionicApp._overlayPortal.getActive();

      if (activePortal) {
        activePortal.dismiss();
        return;
      }

      // Navigate back
      if (this.navCtrl.canGoBack()) {

        this.app.goBack();

      }else {
        WeixinJSBridge.call(‘closeWindow‘);
      }
    };

    // Fake browser history on each view enter
    this.app.viewDidEnter.subscribe((app) => {
      history.pushState(null, null, "");
    });
  }