安装 nodejs

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npm install --save express
npm install --save socket.io

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var app = require(‘express‘)();
var http = require(‘http‘).Server(app);
var io = require(‘socket.io‘)(http);

app.get(‘/‘, function(req, res){
	res.send(‘<h1>Welcome Realtime Server</h1>‘);
});

http.listen(3000, function(){
	console.log(‘listening on *:3000‘);
});