我使Javascript与Flask一起使用，并在可接受的方法列表中添加了“ OPTIONS”。装饰器应在路线装饰器下方使用，如下所示：
@app.route('/login', methods=['POST', 'OPTIONS'])@crossdomain(origin='*')def login() ...编辑： 链接似乎已断开。这是我使用的装饰器。
from datetime import timedeltafrom flask import make_response, request, current_appfrom functools import update_wrapperdef crossdomain(origin=None, methods=None, headers=None, max_age=21600, attach_to_all=True, automatic_options=True): """Decorator function that allows crossdomain requests. Courtesy of https://blog.skyred.fi/articles/better-crossdomain-snippet-for-flask.html """ if methods is not None: methods = ', '.join(sorted(x.upper() for x in methods)) # use str instead of basestring if using Python 3.x if headers is not None and not isinstance(headers, basestring): headers = ', '.join(x.upper() for x in headers) # use str instead of basestring if using Python 3.x if not isinstance(origin, basestring): origin = ', '.join(origin) if isinstance(max_age, timedelta): max_age = max_age.total_seconds() def get_methods(): """ Determines which methods are allowed """ if methods is not None: return methods options_resp = current_app.make_default_options_response() return options_resp.headers['allow'] def decorator(f): """The decorator function """ def wrapped_function(*args, **kwargs): """Caries out the actual cross domain pre """ if automatic_options and request.method == 'OPTIONS': resp = current_app.make_default_options_response() else: resp = make_response(f(*args, **kwargs)) if not attach_to_all and request.method != 'OPTIONS': return resp h = resp.headers h['Access-Control-Allow-Origin'] = origin h['Access-Control-Allow-Methods'] = get_methods() h['Access-Control-Max-Age'] = str(max_age) h['Access-Control-Allow-Credentials'] = 'true' h['Access-Control-Allow-Headers'] = "Origin, X-Requested-With, Content-Type, Accept, Authorization" if headers is not None: h['Access-Control-Allow-Headers'] = headers return resp f.provide_automatic_options = False return update_wrapper(wrapped_function, f) return decorator
