我试图让一个警报功能在flask中运行，其基本思想是使该功能将任务添加到调度模块中，以便它将在后台运行并最终显示一条消息。但是，当我提交表单时，页面只是试图无休止地加载新任务，直到到达时间为止。我以为它必须与插入函数的位置有关，但我不确定在哪里插入。

def alarm():
    now = time.time()
    date_time = request.form['alarm']
    date_format = '%Y-%m-%dT%H:%M'
    alarm_for = int(time.mktime(time.strptime(date_time,date_format)))
    run_for = int(alarm_for) - int(now)
    s.enter(run_for,1,alarm_msg)
    while True:
        s.run(blocking=False)

@app.route('/',methods=['POST','GET'])      #adding two methods posting and getting
def index():
    if request.method == 'POST':    #submitting form
        task_content = request.form['content'] #create new task from user input
        alarm_content = request.form['alarm']
        alarm_tmp = alarm_content.replace('T','-').replace(':','-').split('-') #converting databse to python,help from stack-overflow
        alarm_tmp = [int(v) for v in alarm_tmp]
        alarm_datetime = datetime(*alarm_tmp)
        new_task = Table(content=task_content,alarm=alarm_datetime) #have the contents = input
        alarm()

        try:
            db.session.add(new_task)    #add to database
            db.session.commit()
            return redirect('/') #redirect to input page

        except:
            return 'There was an error'
    else:
        tasks = Table.query.order_by(Table.date_created).all() #showing all contents on site
        return render_template('index.html',tasks=tasks)    #user viewing the page