javascript - In a browser extension, how do I click a specific button of an alert? -

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so...

i need click [stay on page] automatically in such prompt:

confirm navigation: [leave page] [stay on page]

the code invokes 

$(window).bind('beforeunload', function() {   return 'leave page?';   //click prompt code goes here.   $(window).unbind(); });

if take away return 'leave page?'; iframed page overrides top frame , user struck unknown site, maybe there's way this?

actually hook onbeforeunload event:

$(window).bind('beforeunload', function() {       return 'leave page?'; });

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