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那些你可能不知道的Web APIs
source link: https://juejin.im/post/5c6b64dfe51d457f926d5232
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1.Page Visibility(判断网页的可见性)这个新的 API 的意义在于，通过监听网页的可见性，可以预判网页的卸载，还可以用来节省资源，减缓电能的消耗我们之前在实现一个业务需求的时候，判断一个页面是否失焦，用的是 onblur、onfocus，有了这
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