As navigator, Lovell took with him a sextant to take star readings - in case the computers failed and they had to find their own way home.
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.。业内人士推荐爱思助手下载最新版本作为进阶阅读
The best instant camera for portability。搜狗输入法下载对此有专业解读
"""数据实体类 - 封装抓取结果"""，推荐阅读91视频获取更多信息
即用型 Colab Notebook