[Vuejs]-How to determine that a browser tab is selected and execute code in JavaScript?

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You might want to use this ancient method and JS syntax, before you adopt it for your final coding style. Have some classic vanilla flavor. It never hurts. 

document.body.onfocus = function(e){console.info(e.type)}
should work exactly as requested...
but since this behavior is somewhat tied to the BOM, some browser vendors (with idiosyncratic behaviors) might require some sort of enforced filtering,  Opera comes to mind. 

But it should be rock solid on all modern browsers including a bonus backward compatibility, as back as Windows 98 browser version. And\or the ancient and now probably forgoten NN 4.7. ( except for the console info event log, but that's not needed for the actual use anyway )

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