非阻塞多路IO

socket.listen()

rfds=[]

wfds=[]

while(select(rfds,wfds,timeout)){//事件循环

client=socket.accept(timeout)

if(client)

rfds.push(client)

wfds.push(client)

if(rfds){//读事件处理

rfds.forEach(function(client){

)

}

if(wfds)//写事件处理{

}

}