Flash actionscript 3.0 I have no special talent. I am only passionately curious

var isKeyOne:Boolean = false;
var isKeyTwo:Boolean = false

stage.addEventListener(Event.ENTER_FRAME, checkTrue);

function checkTrue(event:Event):void
{
if(isKeyOne)
{
test.x--;
}
if(isKeyTwo)
{
test.y--;
}
}

stage.addEventListener(KeyboardEvent.KEY_DOWN, makeTrue);
stage.addEventListener(KeyboardEvent.KEY_UP, makeFalse);

function makeTrue(event:KeyboardEvent):void
{
if(event.keyCode == Keyboard.LEFT)
{
isKeyOne = true;
}
if(event.keyCode == Keyboard.UP)
{
isKeyTwo = true;
}
}

function makeFalse(event:KeyboardEvent):void
{
if(event.keyCode == Keyboard.LEFT)
{
isKeyOne = false;
}
if(event.keyCode == Keyboard.UP)
{
isKeyTwo = false;
}
}
Create one MovieClip and Name it as test and Put this Script for Multiple Keyboard Handling