breenda

https://serverfault.com/

https://superuser.com/

https://www.codeproject.com/

exists可以判断文件或者文件夹都存在

import os.path
os.path.exists(path)

init需要初始化所有要存储的属性

public func init(host:String, port:Int64){
   self.host = host
   self.port = port
}