11 ListenChar(2); 12 while KbCheck;end Wait until all keys are released. 13 &This is a loop that flips around doing anything as long as KbCheck 14 reports back that a key is pressed on the keyboard.Means that the 15sprogram doesn't continue until all keys have been released. ●while KbCheck;end ·只要KbCheck=1(检查到有按键被按住)，就一直保持按键检查 状态，直到没有任何一个按键被按住，即所有按键都处于空闲状态， 为随后“正式”开始检查按键行为做好准备。l while KbCheck; end • 只要KbCheck=1（检查到有按键被按住），就一直保持按键检查 状态，直到没有任何一个按键被按住，即所有按键都处于空闲状态， 为随后“正式”开始检查按键行为做好准备