我在运行NodeJS的Raspberry Pi 3上创建了一个Web界面。我的问题是，当第二个客户端连接我的服务器端socket.on volumeCheck将音量值广播到触发客户端socket.on volumeCheck的所有客户端，它触发jQuery-knob的释放功能，该函数将卷发送到服务器，最终以无尽的循环。
任何人都可以帮我解决这个问题吗？
server.js
var express = require('express'),
path = require('path'),
bodyParser = require('body-parser'),
jquery = require('jquery'),
YamahaAPI = require("yamaha-nodejs"),
exec = require('child_process').exec,
app = express(),
server = require('http').Server(app);
io = require('socket.io')(server);
var yamaha = new YamahaAPI("192.168.0.32");
var child;
var currentVolume;
app.use(bodyParser.json()); // support json encoded bodies
app.use(bodyParser.urlencoded({ extended: true })); // support encoded bodies
app.use(express.static('public'));
io.sockets.on('connection', function (socket) {
//******************************************
// Yamaha RX-V 575 Control
//******************************************
//volume
yamaha.getBasicInfo(0).done(function(basicInfo){
var volume = basicInfo.getVolume();
socket.emit('volumeCheck', volume );
});
socket.on('volumeCheck', function (vol) {
console.log( "[Yamaha RX-575]: volume set to " + vol/10 + " dB" );
socket.broadcast.emit('volumeCheck', vol );
yamaha.setVolumeTo(vol, 0);
});
//bass volume
yamaha.getBasicInfo(0).done(function(basicInfo){
var data = basicInfo.getBass();
socket.emit('bassCheck', data );
});
socket.on('bassCheck', function (data) {
console.log( "[Yamaha RX-575]: bass set to " + data );
socket.broadcast.emit('bassCheck', data );
yamaha.setBassTo(data);
});
//treble volume
yamaha.getBasicInfo(0).done(function(basicInfo){
var data = basicInfo.getTreble();
socket.emit('trebleCheck', data );
});
socket.on('trebleCheck', function (data) {
console.log( "[Yamaha RX-575]: treble set to " + data );
socket.broadcast.emit('trebleCheck', data );
yamaha.setTrebleTo(data);
});
//mute on\off
yamaha.getBasicInfo(0).done(function(basicInfo){
var data = basicInfo.isMuted();
if (data == true) {
socket.emit('muteCheck', 1 );
} else {
socket.emit('muteCheck', 0 );
}
});
socket.on('muteCheck', function (data) {
if (data == 1) {
console.log( "[Yamaha RX-575]: unmuted.");
socket.broadcast.emit('muteCheck', 0 );
yamaha.muteOff(0);
} else {
console.log( "[Yamaha RX-575]: muted.");
socket.broadcast.emit('muteCheck', 1 );
yamaha.muteOn(0);
}
});
//******************************************
// Socket Control
//******************************************
function powerSwitchServer(stdNr) {
socket.on(stdNr, function (state) {
socket.broadcast.emit(stdNr, state );
if ( state == 1 ) {
console.log('Steckdose ' + stdNr + ' ausgeschaltet');
child = exec("/scripts/" + stdNr + " 1", function (error, stdout, stderr) {
if (error !== null) { console.log('exec error: ' + error); }
});
} else {
console.log('Steckdose ' + stdNr + ' eingeschaltet');
child = exec("/scripts/" + stdNr + " 0", function (error, stdout, stderr) {
if (error !== null) { console.log('exec error: ' + error); }
});
}
});
}
yamaha.getBasicInfo(0).done(function(basicInfo){
var state = basicInfo.isOn();
if ( state == true ) {
socket.emit('std01', 1 );
} else {
socket.emit('std01', 2 );
}
});
powerSwitchServer("std01");
powerSwitchServer("std02");
});
server.listen(80);
client.html
<html>
<head>
<link rel="stylesheet" href="/css/stylesheet.css">
<link rel="stylesheet" href="/css/jquery-ui.css">
<script src="/js/jquery-3.2.1.min.js"></script>
<script src="/js/jquery-ui.min.js"></script>
<script src="/js/jquery.knob.min.js"></script>
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io.connect('http://192.168.188.32');
function powerSwitchClient(name, socket) {
var nameid = $( "#" + name );
socket.on(name, function (data) {
if ( data == 1 ) {
nameid.prop("checked", true);
} else {
nameid.prop("checked", false);
}
});
nameid.click(function() {
if (nameid.is(':checked')) {
socket.emit( name, "1" );
} else {
socket.emit( name, "2" );
}
});
}
$( function() {
socket.on('volumeCheck', function (data) {
$('.volumeDial').val(data/10).trigger("change");;
});
socket.on('bassCheck', function (data) {
$('.bassDial').val(data/10).trigger("change");;
});
socket.on('trebleCheck', function (data) {
$('.trebleDial').val(data/10).trigger("change");;
});
$(".volumeDial").knob({
'min':-70,
'max':-15,
'step':0.5,
'thickness':0.1,
'fgColor':'#8dffab',
'release' : function (v) {
socket.emit('volumeCheck', v*10);},
'format' : function (value) {
return value + ' dB';},
});
$(".bassDial").knob({
'min':-6,
'max':6,
'step':0.5,
'width':100,
'height':100,
'thickness':0.1,
'fgColor':'#8dffab',
'displayInput': false,
'release' : function (v) {
socket.emit('bassCheck', v*10);},
});
$(".trebleDial").knob({
'min':-6,
'max':6,
'step':0.5,
'width':100,
'height':100,
'thickness':0.1,
'fgColor':'#8dffab',
'displayInput': false,
'release' : function (v) {
socket.emit('trebleCheck', v*10);},
});
$( ".yamahaInputSel" ).checkboxradio({
icon: false
});
powerSwitchClient("std01", socket);
powerSwitchClient("std02", socket);
});
</script>
</head>
<body>
<form action="">
<label class="switch">
<input type="checkbox" id="std01">
<span class="slider" ></span>
</label>
</form>
<form action="">
<label class="switch">
<input type="checkbox" id="std02">
<span class="slider" ></span>
</label>
</form>
<div id="main Controls">
<input type="text" class="volumeDial">
<div id="dialDiv">
<input type="text" class="bassDial"><p>Bass</p>
<input type="text" class="trebleDial"><p>Höhen</p>
</div>
<br><br>
<fieldset id="yamahaInputSel">
<legend></legend>
<label for="radio-1" >HDMI 1</label>
<label for="radio-2" >HDMI 2</label>
<label for="radio-3" >HDMI 3</label>
<label for="radio-4" >HDMI 4</label>
<label for="radio-5" >HDMI 5</label>
<input type="radio" name="radio-1" id="radio-1" class="yamahaInputSel">
<input type="radio" name="radio-1" id="radio-2" class="yamahaInputSel">
<input type="radio" name="radio-1" id="radio-3" class="yamahaInputSel">
<input type="radio" name="radio-1" id="radio-4" class="yamahaInputSel">
<input type="radio" name="radio-1" id="radio-5" class="yamahaInputSel">
</fieldset>
</div>
</body>
</html>