隐藏/显示浏览器选项卡的事件? [英] Event for browser tab hidden/shown?

问题描述

当浏览器标签失去/获得焦点时是否有任何 DOM 事件?我知道在 window 上有 blur 和 focus 事件，但是当整个浏览器窗口失去焦点时它们也会触发.然后浏览器可能对用户仍然可见.当然，这样的事件将是特定于浏览器的，但没关系.

Is there any DOM event for when the browser tab loses/gains focus? I know there are the blur and focus events on window, but they also fire when the browser window as a whole loses focus. The browser might then be still visible to the user. Of course such an event would be browser specific, but that's ok.

我想要这个的原因是因为我运行的动画可能会消耗相当多的 CPU 时间.当浏览器选项卡不可见时，没有理由继续制作动画.现在我知道现代浏览器会降低背景选项卡的计时器分辨率，但我实际上可以暂停动画，这样就不会消耗任何 CPU 时间.

The reason why I want this is because I run animations that might consume quite some CPU time. When the browser tab is not visible there is no reason to continue animating. Now I know that modern browsers reduce the timer resolution of background tabs, but I could actually pause the animation, so that no CPU time whatsoever is consumed.

如果您想知道，这就是我要写的内容:http://panzi.github.com/Browser-Ponies/

In case you are wondering, this is what I'm writing: http://panzi.github.com/Browser-Ponies/

推荐答案

至少 Google Chrome 支持 webkitvisibilitychange 事件和 document.webkitHidden 属性.请参阅可见性 API.但它似乎只在显示的选项卡更改时触发，而不是在整个窗口最小化时触发.Internet Explorer 似乎还有一个 visibilitychange 事件，但是 文档 没有说明任何内容.

At least Google Chrome supports a webkitvisibilitychange event and a document.webkitHidden property. See the visibility API. But it seems only to fire when the shown tab changes, not when the whole window is minimized. There also seems to be a visibilitychange event for Internet Explorer, but the documentation doesn't say anything about it.

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