This utility is very helpful in game controls, etc. (For a sample, type 9 or 0.)
If you had a game with dynamic control of a space ship (up, down, right, left), you could generate the function triggers for the functions like this.
up = u down = n right = j left = h fire = f
Type "up" into the function name. Type "u" into the key box. Repeat these steps with "down" and "n," right and j, left and h, and fire and f. You should finish with something like this:
Copy the script into your game. You will also have to download keybindings.js and upload it to your own site.
Presto! You're done.