Question

我在树莓派中运行python脚本和apache网络服务器。我想使用JavaScript从网页更改python脚本中变量的值。有可能吗？

Answer 1

我们可以使用套接字。为了方便使用套接字，我们可以使用socket.io

Start.html

<!doctype html>
<html>
<head>
    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.6/socket.io.min.js"></script>
</head>

<body>
    <h1>Socket.IO GPIO control</h1>
    <button id="btnGpio">Change GPIO</button>

    <script>
        var socket = io.connect('http://localhost:5000');
        var index = 0;
        socket.on('connect', function () {
            console.log('connected')

            document.getElementById('btnGpio').addEventListener('click', () => {
                index = index + 1;
                console.log('index', index)
                socket.emit('change_gpio', { status: (index % 2 == 0) })
            })
        });
    </script>
</body>
</html>

socket_server.py

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

app = Flask(__name__)
@app.route("/")
def home():
    return render_template("Start.html")

socketio = SocketIO(app)

pin = True
@socketio.on('change_gpio')
def handle_my_custom_event(json):
    pin = json['status']
    print('pin = ' , pin)

@socketio.on('connect', namespace='/')
def test_connect():
    print('Connected')


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

使用pip安装库

pip install flask
pip install flask-socketio

文档：
https://flask-socketio.readthedocs.io/en/latest/

有没有办法从javascript更改python脚本中变量的值？

1 个答案: