如何使用socket.io向特定客户端发送消息

问题描述：

我从socket.io + node.js开始，我知道如何在本地发送消息并广播 socket.broadcast.emit（）功能： - 所有连接的客户端收到相同的消息。

I'm starting with socket.io + node.js, I know how to send a message locally and to broadcast socket.broadcast.emit() function:- all the connected clients receive the same message.

现在，我想知道如何向特定客户端发送私人消息，我的意思是一个私人聊天的插槽2人之间（客户端到客户端流）。谢谢。

Now, I would like to know how to send a private message to a particular client, I mean one socket for a private chat between 2 person (Client-To-Client stream). Thanks.

答

当用户连接时，它应该使用必须唯一的用户名向服务器发送消息，例如一封电邮。

When a user connects, it should send a message to the server with a username which has to be unique, like an email.

一对用户名和套接字应该存储在这样的对象中：

A pair of username and socket should be stored in an object like this:

var users = {
    'userA@example.com': [socket object],
    'userB@example.com': [socket object],
    'userC@example.com': [socket object]
}

在客户端上，发出一个对象具有以下数据的服务器：

On the client, emit an object to the server with the following data:

{
    to:[the other receiver's username as a string],
    from:[the person who sent the message as string],
    message:[the message to be sent as string]
}

在服务器上，侦听消息。收到消息后，将数据发送给接收方。

On the server, listen for messages. When a message is received, emit the data to the receiver.

users[data.to].emit('receivedMessage', data)

在客户端上，侦听来自名为'receivedMessage'的服务器的发出，并通过阅读您可以处理它来自哪些数据以及发送的消息。

On the client, listen for emits from the server called 'receivedMessage', and by reading the data you can handle who it came from and the message that was sent.

如何使用socket.io向特定客户端发送消息

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