Introduction - If you have any usage issues, please Google them yourself
//2.10 implement a stopwatch function (accurate to 0.01 seconds), with timing button and reset button,// when the safety button, the next time start time, while timing the button text from " start time" to " stop the clock" ,// Press the timer button again to stop time while the display text to " start time" , press the reset button and time back to 0:00