node.js - Node socket.io 客户端监听发送给其他客户端的事件

Question

我构建了一个简单的 Node socket.io 服务器和两个简单​​的 Node socket.io 客户端。每个客户端连接到服务器，发送一个请求，等待响应，然后打印它。问题是，每个响应都打印了两次，因为每个客户端不仅得到了自己的响应，还得到了其他客户端的响应!为什么？

这是服务器代码:

var io = require('socket.io').listen(10001);
io.sockets.on('connection', function (socket) {
  socket.on('echo', function (data) {
    console.log("got request to echo "+data);
    socket.emit("echoes", data+" "+data);
  });
});

这是客户端代码:

var socketioclient = require('socket.io-client');
var socket1 = socketioclient.connect(HOST, {port: PORT}); 
var socket2 = socketioclient.connect(HOST, {port: PORT});

socket1.on('connect', function () { console.log("socket1 connected!"); });
socket2.on('connect', function () { console.log("socket2 connected!"); });

socket1.on('echoes', function (result) { console.log("socket1 received: "+result);  });
socket2.on('echoes', function (result) { console.log("socket2 received: "+result);  });

socket1.emit('echo', "aaa");
socket2.emit('echo', "bbb");

这是客户端输出:

socket1 connected!
socket2 connected!
socket1 received: aaa aaa
socket2 received: aaa aaa
socket1 received: bbb bbb
socket2 received: bbb bbb

这是服务器日志:

   info  - socket.io started
   debug - client authorized
   info  - handshake authorized niJGX0EXWvLPw2THZOeD
   debug - setting request GET /socket.io/1/websocket/niJGX0EXWvLPw2THZOeD
   debug - set heartbeat interval for client niJGX0EXWvLPw2THZOeD
   debug - client authorized for 
   debug - websocket writing 1::
got request to echo aaa
   debug - websocket writing 5:::{"name":"echoes","args":["aaa aaa"]}
got request to echo bbb
   debug - websocket writing 5:::{"name":"echoes","args":["bbb bbb"]}
   debug - emitting heartbeat for client niJGX0EXWvLPw2THZOeD
   debug - websocket writing 2::
   debug - set heartbeat timeout for client niJGX0EXWvLPw2THZOeD
   debug - got heartbeat packet
   debug - cleared heartbeat timeout for client niJGX0EXWvLPw2THZOeD
   debug - set heartbeat interval for client niJGX0EXWvLPw2THZOeD
   debug - emitting heartbeat for client niJGX0EXWvLPw2THZOeD
   debug - websocket writing 2::
   debug - set heartbeat timeout for client niJGX0EXWvLPw2THZOeD

Answer 1

默认情况下，socket.io 客户端将重复使用从同一客户端到同一主机/端口 (doc) 的现有连接。您可以使用 force new connection 选项禁用此行为:

// client.js
var socket1 = socketioclient.connect(HOST, {port: PORT, 'force new connection': true });
var socket2 = socketioclient.connect(HOST, {port: PORT, 'force new connection': true });