特殊装饰器

before_request、after_request

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from flask import Flask,render_template,redirect app = Flask(__name__)   """ before_reuqest = [xxxxxxxxxx1,xxxxxxxxxx2] """ @app.before_request def xxxxxxxxxx1():     print('前1')   @app.before_request def xxxxxxxxxx2():     print('前2') """ after_request = [oooooooo1,oooooooo2] [oooooooo2,oooooooo1,] reversed(after_request) """ @app.after_request def oooooooo1(response):     print('后1')     return response   @app.after_request def oooooooo2(response):     print('后2')     return response       @app.route('/x1',methods=['GET','POST']) def x1():     print('视图函数x1')     return "视图函数x1"   @app.route('/x2',methods=['GET','POST']) def x2():     print('视图函数x2')     return "视图函数x2"   if __name__ == '__main__':     app.__call__     app.run()

before_request返回

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from flask import Flask,render_template,redirect app = Flask(__name__)   @app.before_request def xxxxxxxxxx1():     print('前1')     return "不要再来烦我了"   @app.before_request def xxxxxxxxxx2():     print('前2')   @app.after_request def oooooooo1(response):     print('后1')     return response   @app.after_request def oooooooo2(response):     print('后2')     return response       @app.route('/x1',methods=['GET','POST']) def x1():     print('视图函数x1')     return "视图函数x1"   @app.route('/x2',methods=['GET','POST']) def x2():     print('视图函数x2')     return "视图函数x2"   if __name__ == '__main__':     app.__call__     app.run()

before_request实现用户登录

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from flask import Flask,render_template,redirect,request,session app = Flask(__name__) app.secret_key = 'asdfasdfasdf' @app.before_request def check_login():     if request.path == '/login':         return None     user = session.get('user_info')     if not user:         return redirect('/login')   @app.route('/login',methods=['GET','POST']) def login():     return "视图函数x1"   @app.route('/index',methods=['GET','POST']) def index():     print('视图函数x2')     return "视图函数x2"   if __name__ == '__main__':     app.run()

errorhandler() 报错返回友好界面

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@app.errorhandler(404) def error404(args):     print(args)     return "您访问的页面不存在或者走丢了,,,,,,%s" % (args)