Vue Development-binds the method to the Window object and calls to the app side

With the Jsbridge method, H5 can invoke the internal method of the client (ios,android), and the client also needs to be able to invoke the JS method defined in the H5 page, but in Vue, all the methods are declared within the component and can only be called inside the component. It is not bound under the Window object, so how can the method defined in the Vue component be exposed to the window object and provided for external invocation?

Mounted () {    ///Backtoday method is bound to window below, provided to external call     window[' backtoday '] = () = {        this.gotoday ()     }}, Methods: {    gotoday () {        //To do something    }}

　　

Vue Development-binds the method to the Window object and calls to the app side