终端报错:Path must be a string. Received null
感觉上是 __dirname的问题，但是我改成相对路径后还是报错，求大神指导一下刚学node的小白，感激不尽~
app.js下：
var app = require('express').createServer(),
io = require('socket.io').listen(app);
app.listen(1111);
app.get('/',function(req,res){
res.sendfile(__dirname+'/index.html');
});
io.sockets.on('connection',function(socket){
socket.emit('welcome',{text:'hello world!'})
})
index.html下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>socket.io chatting!</title>
<script src="/socket.io/socket.io.js"></script>
</head>
<body>
<h1>let's chatting~</h1>
<script>
var socket = io.connect();
socket.on('welcome',function(data){
console.log(data.text);
})
</script>
</body>
</html>
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