Call a JS function after all WebMethods are executed

Is there a way to call a function after all WebMethods are executed?  So, in other words, I call WebMethod A which calls Webmethods a2 and a3.  I also call Webmethod B which calls b2 and b3.   Once a3,a2,A,b3,b2, and B are all complete, I want to call function afterEverything() for example.  Can this be done?
Thanks,
Aaron

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