将值从 html 网页传递到 Nodejs 服务器
我需要你的帮助我正在学习本教程：“socket.io”：“^4.6.1”和我的目标是使用 socketio 将数据从我的 html 页面传递到我的 nodejs 服务器，但我不断收到错误消息：
GET http://127.0.0.1:5500/socket.io/?EIO=4&transport=polling&t=OVI3WYK 404 (Not Found)我的服务器：
var http = require('http');
var fs = require('fs');
var index = fs.readFileSync( 'index.html');
const { SerialPort } = require('serialport')
const { ReadlineParser } = require('@serialport/parser-readline')
const parser = new ReadlineParser({ delimiter: '\r\n' });
var port = new SerialPort(
{ path: 'COM3', baudRate: 9600 , dataBits: 8, parity: 'none', stopBits: 1, flowControl: false}
);
port.pipe(parser);
var app = http.createServer(function(req, res) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.end(index);
});
var io = require('socket.io')(app);
io.on('connection', function(socket) {
socket.on('lights',function(data){
console.log( data );
port.write( data.status );
});
});
app.listen(5500);
我的index.html：
<!doctype html>
<html>
<head>
<title>Communicating from Node.js to an Arduino</title>
<script src=".5.4/socket.io.min.js"></script>
</head>
<body>
<h1>Communicating from Node.js to an Arduino</h1>
<button id="lightOn">Turn Light On</button>
<button id="lightOff">Turn Light Off</button>
<script>
var socket = io();
document.getElementById('lightOn').onclick = function() {
socket.emit('lights', { "status":"1" });
};
document.getElementById('lightOff').onclick = function(){
socket.emit('lights', { "status":"0" });
};
</script>
</body>
</html>