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.
这个过程也很漫长，持续到了上幼儿园的时候，大概1年左右。这一步现在看来，还是非常有必要的，非常好的缓解了孩子的分离焦虑。，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。
。关于这个话题，爱思助手下载最新版本提供了深入分析
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Jake Pickering, head of agriculture, aquaculture and fisheries at Waitrose, said: "By suspending sourcing of mackerel at Waitrose, we are reinforcing our ethical and sustainable business commitments, acting to tackle overfishing and protect the long-term health of our oceans and this crucial fish."
'Postcode lottery' of rubbish