How does Ares computer keyboard simulate a joystick?

WSAD moves up and down, ZXQE rolls up and down, JKLI is the key of attack and jump, FVCB is the key of D-PAD playing skills, WSAD moves up and down, ZXQE rolls up and down, JKLI is the key of attack and jump, and FVCB is the key of D-PAD playing skills.