pip install flask-cors

from flask import Flask, jsonify
from flask_cors import CORS

app = Flask(__name__)
CORS(app, supports_credentials=True)

@app.route("/data")
def data():
    products = [
        {"name": "香蕉", "price": 20},
        {"name": "桔子", "price": 21},
        {"name": "橙子", "price": 23},
    ]
    return jsonify(products)

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