Rather exit (by BACK) call a function hide all sub-pages and show Home page sub-page of index.html...?

i DEVELOPED A CORDOVA / XDK App
Bootstrap 3.4
having 3 pages index.html , search.html, about.html

since index.html has three sub-pages and hidden shown accordingly when, I am in any of these sub-pages in index and press BACK Android I exit App…

Is any way rather exit (by BACK) call a function hide all sub-pages and show Home page sub-page of index.html…???

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