// 步骤3：从后往前遍历数组（反向遍历更易理解，每个元素只入栈/出栈一次）
Quadtrees are everywhere spatial data exists. Mapping services use quadtree-like tile pyramids to serve map tiles at different zoom levels (Bing's quadkey system, for example, addresses tiles as base-4 paths). Game engines use them for collision detection and visibility culling. Geographic information systems use spatial indexes to store and query spatial datasets. PostGIS uses GiST indexes (R-tree-style) for spatial queries on geometries, while PostgreSQL's core supports quadtree-like SP-GiST indexes for certain data types like points.，这一点在雷电模拟器官方版本下载中也有详细论述
。业内人士推荐51吃瓜作为进阶阅读
writevSync(batch) { for (const c of batch) addChunk(c); return true; },
sv-enable mysqld。爱思助手下载最新版本对此有专业解读