使用 socket.io 和 node.js 向特定客户端发送消息
我正在使用 socket.io 和 node.js，直到现在看起来还不错，但我不知道如何从服务器向特定客户端发送消息，如下所示:
I'm working with socket.io and node.js and until now it seems pretty good, but I don't know how to send a message from the server to an specific client, something like this:
client.send(message, receiverSessionId)
但是 .send() 和 .broadcast() 方法似乎都不能满足我的需要.
But neither the .send() nor the .broadcast() methods seem to supply my need.
我发现一个可能的解决方案是 .broadcast() 方法接受一个不向其发送消息的 SessionIds 数组作为第二个参数，因此我可以传递一个数组当时连接到服务器的所有SessionId，除了我希望发送消息的那个，但我觉得必须有更好的解决方案.
What I have found as a possible solution, is that the .broadcast() method accepts as a second parameter an array of SessionIds to which not send the message, so I could pass an array with all the SessionIds connected at that moment to the server, except the one I wish send the message, but I feel there must be a better solution.
有什么想法吗?
好吧，您必须为此抓住客户(惊喜)，您可以选择简单的方法:
Well you have to grab the client for that (surprise), you can either go the simple way:
var io = io.listen(server);
io.clients[sessionID].send()
这可能会中断，我对此表示怀疑，但 io.clients 总是有可能被更改，因此请谨慎使用上述内容
Which may break, I doubt it, but it's always a possibility that io.clients might get changed, so use the above with caution
或者您自己跟踪客户端，因此您将它们添加到 connection 侦听器中的您自己的 clients 对象中，并在 disconnect中删除它们代码>监听器.
Or you keep track of the clients yourself, therefore you add them to your own clients object in the connection listener and remove them in the disconnect listener.
我会使用后一种，因为根据您的应用程序，无论如何您可能希望在客户端上拥有更多状态，因此类似于 clients[id] = {conn: clientConnect, data: {...}} 可能会完成这项工作.
I would use the latter one, since depending on your application you might want to have more state on the clients anyway, so something like clients[id] = {conn: clientConnect, data: {...}} might do the job.