var app = require(‘express’).createServer(), io = require(‘socket.io’).listen(app);

app.listen(3000);

app.get('/’, function (req, res) { res.sendfile(__dirname + ‘/index.html’); });

io.sockets.on('connection’, function (socket) { socket.emit('welcome’, { text: ‘OH HAI! U R CONNECTED!’ }); });

目录下面有index.html 报错内容是： TypeError: Arguments to path.join must be strings at f (path.js:204:15) at Object.filter (native) at exports.join (path.js:209:40) at exports.send (C:\Users\Administrator\nodejs\demo\socket.io_express\node_modules\express\node_modules\connect\lib\middleware\static.js:129:20) at ServerResponse.res.sendfile (C:\Users\Administrator\nodejs\demo\socket.io_express\node_modules\express\lib\response.js:186:3) at io.sockets.on.socket.emit.text (C:\Users\Administrator\nodejs\demo\socket.io_express\app.js:7:7) at callbacks (C:\Users\Administrator\nodejs\demo\socket.io_express\node_modules\express\lib\router\index.js:272:11) at param (C:\Users\Administrator\nodejs\demo\socket.io_express\node_modules\express\lib\router\index.js:246:11) at pass (C:\Users\Administrator\nodejs\demo\socket.io_express\node_modules\express\lib\router\index.js:253:5) at Router._dispatch (C:\Users\Administrator\nodejs\demo\socket.io_express\node_modules\express\lib\router\index.js:280:5)

哪里出问题了额