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我们祝愿你可以沉浸在 Web 网站的音频和视频当中,下一篇文章,我们将会学习到另外一种在 web 页面中嵌入内容的方法,比如使用或者。 参见 HTML 媒体元素:、、和 向视频添加字幕和标题 音频和视频传送:使用 HTML 和 JavaScript 在网页上放置音频和视频的详细信息。 音频和视频操作:使用 JavaScript 对音频和视频进行详细...
还有一个是mozilla开发者网站的MDN文档,网址是:https://developer.mozilla.org/en-US/docs/Web 这个网站打开比较慢,所以需要有耐心。 不过比较方便的是,官方提供了离线的文档给我们,官方称它为离线MDN,在关于MDN的页面可以看到:https://developer.mozilla.org/en-US/docs/MDN/About 点击那个a full tarball mirror...
#event-beforeunload HTML #handler-window-onbeforeunload See also BeforeUnloadEventinterface Related events: DOMContentLoaded readystatechange load unload Page Lifecycle APIprovides more useful guidance on handling page lifecycle behavior in your web apps. ...
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
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The API is down for maintenance. You can continue to browse the MDN Web Docs, but MDN Plus and Search might not be available. Thank you for your patience! References Web APIs Window open() English (US) Window: open() method Limited availability This feature is not Baseline because it doe...
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
传给waitUntil()的 promise 会阻塞其他的事件,直到它完成,因此你可以放心,当你在新的 service worker 中得到你的第一个fetch事件时,你的清理操作已经完成。 js constdeleteCache=async(key)=>{awaitcaches.delete(key);};constdeleteOldCaches=async()=>{constcacheKeepList=["v2"];constkeyList=awaitcaches.ke...
The MDN Web Docs project welcomes contributions from everyone who shares our goals and wants to contribute constructively and respectfully within our community. To find out how to get started, see the CONTRIBUTING.md document in this repository. By participating in and contributing to our projects ...