使用flask-websockets的异步网页上的文本不更新

我正试图让这个网页使用python flask服务器和来自Arduino设备的MQTT值进行异步更新。所有的值都通过并被正确保存，但是这些值并没有在网页上显示出来。

我认为这可能与试图使用$('#humidity').text写到id标签有关。

以下是相关的HTML。

   <script type="text/javascript" charset="utf-8">
      $(document).ready(function() {
        var socket = io.connect('http://' + document.domain + ':' + location.port);
        socket.on('connect', function() {
          socket.emit('my event', {data: 'I\'m connected!'});
        socket.on('dht_temperature', function(msg) {
      var nDate = new Date();
          $('#readingsUpdated').text(nDate.getHours() + 'h:' + nDate.getMinutes() +
             'm:' + nDate.getSeconds() + 's').html();
          $('#temperature').text(msg.data).html();
        socket.on('dht_humidity', function(msg) {
          $('#humidity').text(msg.data).html();
   </script>
   <h1>RPi Web Server - ESP8266 MQTT</h1>
   {% for pin in pins %}
   <h2>{{ pins[pin].name }}
   {% if pins[pin].state == 'True' %}
      is currently <strong>on</strong></h2><div class="row"><div class="col-md-2">
      <a href="/esp8266/{{pin}}/0" class="btn btn-block btn-lg btn-default" role="button">Turn off</a></div></div>
   {% else %}
      is currently <strong>off</strong></h2><div class="row"><div class="col-md-2">
      <a href="/esp8266/{{pin}}/1" class="btn btn-block btn-lg btn-primary" role="button">Turn on</a></div></div>
   {% endif %}
   {% endfor %}
   <h3>DHT Readings (updated <span id="readingsUpdated"></span>)</h3>
   <h3>Temperature: <span id="temperature"></span>ºC</h3>
   <h3>Humidity: <span id="humidity"></span>%</h3>
</body>
</html>

这里是Python脚本

import paho.mqtt.client as mqtt
from flask import Flask, render_template, request
from flask_socketio import SocketIO, emit
app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
socketio = SocketIO(app)
# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))
    # Subscribing in on_connect() means that if we lose the connection and
    # reconnect then subscriptions will be renewed.
    client.subscribe("/esp8266/temperature")
    client.subscribe("/esp8266/humidity")
# The callback for when a PUBLISH message is received from the ESP8266.
def on_message(client, userdata, message):
    #socketio.emit('my variable')
    print("Received message '" + str(message.payload) + "' on topic '"
        + message.topic + "' with QoS " + str(message.qos))
    if message.topic == "/esp8266/temperature":
        print("temperature update")
    socketio.emit('dht_temperature', {'data': message.payload})
    if message.topic == "/esp8266/humidity":
        print("humidity update")
    socketio.emit('dht_humidity', {'data': message.payload})
mqttc=mqtt.Client()
mqttc.on_connect = on_connect
mqttc.on_message = on_message
mqttc.connect("localhost",1883,60)
mqttc.loop_start()
# Create a dictionary called pins to store the pin number, name, and pin state:
pins = {
   4 : {'name' : 'GPIO 4', 'board' : 'esp8266', 'topic' : 'esp8266/4', 'state' : 'False'},
   5 : {'name' : 'GPIO 5', 'board' : 'esp8266', 'topic' : 'esp8266/5', 'state' : 'False'}
# Put the pin dictionary into the template data dictionary:
templateData = {
   'pins' : pins
@app.route("/")
def main():
   # Pass the template data into the template main.html and return it to the user
   return render_template('main.html', async_mode=socketio.async_mode, **templateData)
# The function below is executed when someone requests a URL with the pin number and action in it:
@app.route("/<board>/<changePin>/<action>")
def action(board, changePin, action):
   # Convert the pin from the URL into an integer:
   changePin = int(changePin)
   # Get the device name for the pin being changed:
   devicePin = pins[changePin]['name']
   # If the action part of the URL is "1" execute the code indented below:
   if action == "1" and board == 'esp8266':
      mqttc.publish(pins[changePin]['topic'],"1")
      pins[changePin]['state'] = 'True'
   if action == "0" and board == 'esp8266':
      mqttc.publish(pins[changePin]['topic'],"0")
      pins[changePin]['state'] = 'False'
   # Along with the pin dictionary, put the message into the template data dictionary:
   templateData = {
      'pins' : pins
   return render_template('main.html', **templateData)
@socketio.on('my event')
def handle_my_custom_event(json):