* @param arr 待排序数组
For implementers, this promise-heavy design constrains optimization opportunities. The spec mandates specific promise resolution ordering, making it difficult to batch operations or skip unnecessary async boundaries without risking subtle compliance failures. There are many hidden internal optimizations that implementers do make but these can be complicated and difficult to get right.
，这一点在谷歌浏览器【最新下载地址】中也有详细论述
Credit: Samsung
另据知情人士透露，SpaceX 目前正筹备公开上市，市场普遍预计这或将成为史上最大规模的首次公开募股（IPO）。
const res = new Array(n);