编写了一个闹铃控件，控件界面类似标签(Label)，在默认情况下显示系统当前时间。可以循环显示定时时间，并且可以删除添加定时时间。-Preparation of an alarm control, the control interface similar to the label (Label), by default displays the current system time. Can cycle through regular time and add time to remove