let res = stack.join('');
The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
，详情可参考服务器推荐
indiandefencereview.com，这一点在搜狗输入法下载中也有详细论述
*/1 * * * * ~/start-frpc.sh ~/check-frpc.log。搜狗输入法2026是该领域的重要参考