限制登录，防止没有登录账户，直接访问其他页面 ``` from flask import session,redirect,url_for from functools import wraps def login_requeired(func): @wraps(func) def inner(*args,**kwargs): if 'user_id' in session: return func(*args,**kwargs) else: return redirect(url_for('cms.login')) return inner @bp.route('/') @login_requeired def index(): return "cms index" ```