How do I create a flag when fallback link was executed in requireJS

问题

I have this piece of code:

var skin = "christmas";

    requirejs.config({

    paths: {
        languagesLocal : [
            BaseUrl +  skin + '/js/languagesLocal',
            BaseUrl +  "default" + '/js/languagesLocal'

        ]
    }
});

I want to have a variable that tells me which link was executed.

something like isFallbackLinkWasExecuted == true

How can I achieve that? or execute a code incase the fallback link was triggered.

来源：https://stackoverflow.com/questions/13974386/how-do-i-create-a-flag-when-fallback-link-was-executed-in-requirejs