How to stop repeating of a function when triggered by keypress in javascript?

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Javascript

keypress

I've got a piece of code that detects when certain keys are pressed then triggers a function, but the function repeats after triggered, with any key pressed. I've tried to reset the array at the end of the function, but this stops all keys from triggering the function in the first place.

var key = [];
onkeydown = onkeyup = function(e){
    e = e || event;
    map[e.keyCode] = e.type == 'keydown';
    if(key[17] && key[16] && key[65]){ //CTRL+SHIFT+A
        alert('Enabled');
        enableControls();
        key[];
        return false;
    }
 }

How can I stop the function repeating with any keys pressed after the function has run? Any help is greatly appreciated!

What I have tried:

I've tried to reset the array at the end of the function with "key[];", but this stops all keys from triggering the function in the first place.