你真的了解顾客需求吗？要实现持续经营，核心是抓住复购。而复购的前提，是真正了解顾客需求。
The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.
，这一点在一键获取谷歌浏览器下载中也有详细论述
Downloading from 'updates'... done
const srcObjDesc = Object.getOwnPropertyDescriptor(
(and thanks to Matthew Miller for reviewing and providing feedback on this post)