独立查询域名是否注册,并有辅助线程查询其它域名信息,为提高查询速度建立坚强后盾.在频繁查询时, 域名服务器,可能无法及时返回信息,可以尝试使用 查询等待, 有效避免服务器忙的域名状态. -Multithreaded independent inquiry whether the domain name registration, and other auxiliary thread queries the domain information, the establishment of strong backing to improve query speed during frequent query, domain name server, you may not be timely return information, you can try to use the query wait, avoid server busy the domain name status.