Flask + Socketio -如何加入路由内的房间(而不是socketio函数内)

pip install flask
pip install flask-socketio

from flask import Flask, render_template
from flask_socketio import SocketIO, join_room

app = Flask(__name__)
app.config['SECRET_KEY'] = 'your-secret-key'
socketio = SocketIO(app)

@app.route('/')
def index():
    return render_template('index.html')

@socketio.on('connect')
def handle_connect():
    room = 'room1'  # 房间名称
    join_room(room)  # 加入房间
    print('加入房间:', room)

if __name__ == '__main__':
    socketio.run(app)

<script src="//cdn.socket.io/socket.io-3.1.3.js"></script>
<script>
    var socket = io.connect('http://localhost:5000');
    socket.on('connect', function() {
        socket.emit('join_room');
    });
</script>