node.js socket.io 发出回调合适吗？
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Is socket.io emit callback appropriate?
提问by antanas_sepikas
Recently I have been messing around with socket.io and found this interesting thing, that I can have emit function callback like this.
最近我一直在弄弄socket.io，发现了一个有趣的事情，我可以像这样发出回调函数。
I start emitting on client side like this:
我开始像这样在客户端发射：
client.emit('eventToEmit', dataToEmit, function(error, message){
console.log(error);
console.log(message);
});
Then I can fire a callback from server-side like this:
然后我可以像这样从服务器端触发回调：
client.on('eventToEmit', function(data, callback){
console.log(data);
callback('error', 'message');
});
Everything works fine with no errors, but I am interested if doing something like this is appropriate since I have not seen anything similar in the documentation or any example so far.
一切正常，没有错误，但我很感兴趣，如果这样做是合适的，因为到目前为止我还没有在文档或任何示例中看到任何类似的内容。
采纳答案by robertklep
It's perfectly legal.
这是完全合法的。
Those callbacks are called 'acknowledgement functions' and are summarily mentioned in the Wikiand described a bit more in detail on the NPM page('Getting acknowledgements').
这些回调称为“确认函数”，在 Wiki中进行了简要介绍，并在NPM 页面（“获取确认”）上进行了更详细的描述。
EDIT: more recent documentation can be found here.
编辑：可以在此处找到更多最新文档。
