用javafx开一个stage，在sence上显示出一个时钟，时钟有刻度，显示当前时间，但是时钟不是动的，只能指在当前时间的位置-Use javafx to open a stage, in sence show a clock, the clock has a scale, display the current time, but the clock is not moving, can only refer to the current time position