Live update on running app

Hi all,

I need help on how to deal with this. I have an app running. I make some change to html/js and deploy with ionic pro. The update only work if i kill the app and reopen (test with ios iphone 6s and ipad mini 2). Most user will not kill the app so the app keep running old html/js. is there away to force update? ionic pro have 3 option i have use the first one, update background and update on open app.