flask后端的跨域问题

from flask import Flask, make_response, jsonify

app = Flask(__name__)

# 封装一个response函数，“*”代表响应头里允许全部域名访问
def make_new_response(data):
    res = make_response(jsonify({'code': 0, 'data': data}))
    res.headers['Access-Control-Allow-Origin'] = '*'
    res.headers['Access-Control-Allow-Method'] = '*'
    res.headers['Access-Control-Allow-Headers'] = '*'

    return res

# 接口的response，将数据传入make——new-response
@app.route("/test")
def test():
    res = "{'no':'dddd'}"
    return make_new_response(res)


if __name__ == "__main__":
    app.run(debug=True)