const app = require('http').createServer(handler)
const io = require('socket.io')(app)
function handler(req,res){
fs.readFile(__dirname+'/index.html',(err,data)=>{
return res.end('Error loading index.html,server error!')
io.on('connection',(socket)=>{
socket.emit('news',{hello:'world'})//发送个客户端消息
socket.on('my other event',(data)=>{