日志：
2018/12/02 17:08:40 [error] 18452#19916: CreateFile() "D:\nginx-1.12.2/logs/nginx.pid" failed (2: The system cannot find the file specified)
任务管理器结束nginx进程，或者cmd进入nginx目录，输入nginx -s quit，然后重启nginx
使用命令创建/logs/nginx.pid文件:
nginx -c conf/nginx.conf