安装模块

pip install flask-cors

全局允许跨域

from flask import Flask
from flask_cors import CORS

if __name__ == '__main__':
    app = Flask(__name__)

    @app.route('/', methods=['GET', 'POST'])
    def index():
        return 'HELLO WORD'

    CORS(app, supports_credentials=True)
    app.run(port=8123)

指定方法允许跨域

@app.route('/', methods=['GET', 'POST'])
@cross_origin()
def index():
    return 'HELLO WORD'