javascript - How to tell if the user has switched to the current tab?

Question

I noticed that YouTube only starts playing videos when the user switches to the current tab. So when a user opens multiple tabs, how to determine whether the user has switched to the current tab?

高洛峰 · Answer

There is a Page Visibility API, you can take a look

I have thought about this implementation before, but it actually has shortcomings. What if sometimes I just want to listen to the sound? (:evil

天蓬老师 · Answer

document.addEventListener('visibilitychange', function() {
    if (!document.hidden) {
        // code
    }
})

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