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, "");

    });

  }