节点socket.io客户端侦听发送到其他客户端的事件

Question

我构建了一个简单的Node socket.io服务器和两个简单​​的节点socket.io客户端。每个客户端连接到服务器，发送一个请求，等待响应并打印出来。问题是，每个响应打印两次，因为每个客户不仅得到他自己的回应，还得到另一个客户的回应！为什么？

这里是服务器代码：

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); 
    }); 
}); 

下面是客户端代码：

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"); 

下面是客户端输出：

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

这里是服务器日志：

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 });