我有一个连接到某些温度传感器的raspi，并且数据以字符串格式发送到pi上的网页。我抓取页面并获取数据，然后尝试使用socketio将其发送到前端的js仪表。我按照有效的基本聊天应用程序上的教程进行操作。我尝试用自己的函数复制该文件，但没有得到任何东西。
app.py
from flask import Flask, render_template
from flask_socketio import SocketIO, send, emit
import bs4 as bs
import ast
import urllib.request
app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
socketio = SocketIO(app)
@app.route('/')
def index():
return render_template('index.html')
@socketio.on('message')
def handle_message(msg):
print('[server]: ' + msg)
send(msg, broadcast=True)
@socketio.on('scrape')
def get_data(a0, a1, a2, a3):
source = urllib.request.urlopen("http://192.168.1.8/data.php")
soup = bs.BeautifulSoup(source, 'lxml')
values = ast.literal_eval(soup.p.string)
values = str(values.get('ainputs'))
a0 = values[3:8]
a1 = values[12:18]
a2 = values[21:27]
a3 = values[30:36]
print('[inputs]: ' + a0)
emit(a0, a1, a2, a3, broadcast=True)
if __name__ == '__main__':
socketio.run(app)
和index.html（包括脚本）
<html>
<head>
<title>Chat Room</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.2.0/socket.io.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
</head>
<body>
<script type="text/javascript">
$(document).ready(function() {
var socket = io.connect('http://127.0.0.1:5000');
socket.on('connect', function() {
socket.send("User has connected!");
});
socket.on('message', function(msg) {
$("#messages").append('<li>'+msg+'</li>');
console.log('data check successful');
});
socket.on('scrape', function() {
socket.emit(a0);
});
$('#sendButton').on('click', function() {
socket.send($('#myMessage').val());
$('#myMessage').val('');
});
});
</script>
<ul id="messages"></ul>
<input type="text" id="myMessage">
<button id="sendButton">Send</button>
</body>
</html>