trigger certain actions in one app based on events in another app.
HTMLMediaElement: playbackRate property — MDN Web Docs，更多细节参见下载安装 谷歌浏览器 开启极速安全的 上网之旅。
* 核心思路：倒序单调栈（适配你的学习习惯），时间复杂度O(n)，空间复杂度O(n)。业内人士推荐夫子作为进阶阅读
writable: false means no code can reassign window.Audio to a different value. configurable: false means no code can even call Object.defineProperty again to change those settings. If fermaw’s initialisation code tried to restore the original Audio constructor (a perfectly sensible defensive move) the browser would either fail or throw a TypeError. The hook was permanent for the lifetime of the page.，更多细节参见搜狗输入法下载