Saiba mais em: http://tadeubarbosa.github.io/audio-somente-em-aba-mestre/

aba-mestre.js

	
	// Para saber mais siga até: http://tadeubarbosa.github.io/audio-somente-em-aba-mestre/

	///////
	// Funções simples mas que ajudam bastante neste projeto

	// Time: Gist > https://gist.github.com/tadeubarbosa/969a249e68e3ac55f341
	time = function(){return new Date().getTime().toString().substring(0,10);};

	// Repeat : Gist > https://gist.github.com/tadeubarbosa/57ba0b9cab817afef487
	String.prototype.repeat=function(num){return new Array(num+1).join(this);}

	// Random : Gist > https://gist.github.com/tadeubarbosa/f7b16de4a95204a5ebf1
	random=function(rep){min=parseInt('1'.repeat(rep));max=parseInt('9'.repeat(rep));return Math.floor(Math.random()*(max-min+1))+min;}
	
	///
	////////

	var app;

	if ( !sessionStorage['window'] ) sessionStorage['window'] = random( 9 );

	(app.fn=function(){
	
		if( !localStorage['window'] || parseInt(localStorage['time']) < ( time()-3 ) )
		{
			localStorage['window'] = sessionStorage['window'];
		}
		
		app.mestre = (sessionStorage['window'] == localStorage['window']);
		
		if( !app.mestre ) return;

		localStorage['time'] = time();
	 
	})();

	setInterval(function(){ app.fn(); }, 1000);