回调中的res参数http.get()不是正文，而是一个http.ClientResponse对象。您需要组装车身：
var url = 'http://graph.facebook.com/517267866/?fields=picture';
http.get(url, function(res){
var body = '';
res.on('data', function(chunk){
body += chunk;
});
res.on('end', function(){
var fbResponse = JSON.parse(body);
console.log("Got a response: ", fbResponse.picture);
});
}).on('error', function(e){
console.log("Got an error: ", e);
});
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