How to judge a key is pressed in script?

I used keyboard. iskeydowm to judge, but it can only be used with a hold-down, not just press once.

Well if you are trying to get a single input when a key is presses I suggest using 'On key pressed.' The difference is, with 'iskeypressed' it is checking if the key is being pressed at the moment, almost like a while loop. But 'on the key pressed' it simply checks when the key is first pressed and returns True.

Example: On 'up arrow' pressed = Jump

is 'up arrow' pressed = keep jumping while true

Sorry if this is really wordy. I hope this helps you, and you make progress!

Listen for the "keydown" event as documented in the scripting reference.