传统建筑劳务市场，最大的痛点是信息不对称。工人们常常是“考勤时只张嘴、结款时跑断腿”。这种依靠人际关系的用工管理，给项目方和劳动者都带来极大的不确定性。
for each candidate in list of candidates。快连下载-Letsvpn下载对此有专业解读
。safew官方版本下载对此有专业解读
The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.
// document_start means these listeners are in place before any element exists，这一点在Line官方版本下载中也有详细论述