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以下是一个简单的HTML页面，它包含一个输入框、一个发送按钮和一个显示区域。用户可以在输入框中输入消息，点击发送按钮，然后这个消息会被发送到 Flask-SocketIO 服务器。当服务器回应消息时，它会在页面的显示区域显示出来。
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Flask-SocketIO Chat</title><!-- Import the Socket.IO client library --><script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.0.1/socket.io.js"></script><script type="text/javascript">document.addEventListener("DOMContentLoaded", function() {const socket = io.connect('http://localhost:5000');const messagesDiv = document.getElementById('messages');const inputElem = document.getElementById('messageInput');const buttonElem = document.getElementById('sendButton');// Listen for a 'response' event from the serversocket.on('response', function(msg) {const pElem = document.createElement('p');pElem.innerText = msg.data;messagesDiv.appendChild(pElem);});// Send the input message to the server on button clickbuttonElem.addEventListener('click', function() {const message = inputElem.value;socket.emit('send_message', {data: message});inputElem.value = ''; // Clear the input});});</script>
</head>
<body><h1>Flask-SocketIO Chat</h1><input type="text" id="messageInput" placeholder="Type your message here..."><button id="sendButton">Send</button><div id="messages"></div>
</body>
</html>
此外，Flask-SocketIO 服务器端代码可以处理客户端发送的 send_message 事件，并返回一个 response 事件。例如：
from flask import Flask
from flask_socketio import SocketIOapp = Flask(__name__)
socketio = SocketIO(app)@socketio.on('send_message')
def handle_message(message):print('Received message:', message['data'])socketio.emit('response', {'data': 'Server received: ' + message['data']})if __name__ == '__main__':socketio.run(app, debug=True)
当用户在HTML页面上输入消息并点击发送按钮时，消息会被发送到 Flask-SocketIO 服务器。服务器接收到消息后，会发送一个回应，该回应将在页面上显示。