Node.js 组播问题

Question

按照node.js权威指南这本书敲的代码：vardgram=require('dgram');varserver=dgram.createSocket('udp4');server.on('listening',function(){server.setMulticastTTL(128);server.addMembership('230.185.192.108');});setInterval(broadCast,1000);functionbroadCast(){varbuf=newBuffer((newDate()).toLocaleString());server.send(buf,buf.length,8000,'230.185.192.108');}为毛报这样的错啊？我的port是8000,肯定小于65536啊dgram.js:339thrownewRangeError('Portshouldbe>0and

Answer 1

犯了一个低级错误，应该是
server.send(buf,**0**,buf.length,8000,'230.185.192.108');
                            

Answer 2

buf的偏移量没写,一般为0,参考api:socket.send(msg,[offset,length,]port[,address][,callback])
如果不想写偏移量,那么参数中也不能有buf长度