def route(self, rule: str, **options: t.Any) -> t.Callable:

        """Decorate a view function to register it with the given URL

        rule and options. Calls :meth:`add_url_rule`, which has more

        details about the implementation.

        .. code-block:: python

            @app.route("/")

            def index():

                return "Hello, World!"

        See :ref:`url-route-registrations`.

        The endpoint name for the route defaults to the name of the view

        function if the ``endpoint`` parameter isn't passed.

        The ``methods`` parameter defaults to ``["GET"]``. ``HEAD`` and

        ``OPTIONS`` are added automatically.

        :param rule: The URL rule string.

        :param options: Extra options passed to the

            :class:`~werkzeug.routing.Rule` object.

        """

        def decorator(f: t.Callable) -> t.Callable:

            endpoint = options.pop("endpoint", None)

            self.add_url_rule(rule, endpoint, f, **options)

            return f

        return decorator

# 不指定 methods，默认就是 GET

@app.route('/')

def hello_world():

    # 返回字符串

    return '<b>Hello World</b>'

@app.route('/get', methods=["GET"])

def get_():

    # 返回字符串

    return '这是get请求'

@app.route('/post', methods=["POST"])

def post_():

    # 返回字符串

    return {"messgage": "这是post请求"}

@app.route('/delandput', methods=["DELETE", "PUT"])

def delandput():

    # 返回字符串

    return ["delete", "put"]

@app.route('/delandput', methods=["DELETE", "PUT"])

def delandput():

    # 返回字符串

    return {"result": ["delete", "put"]}