different animation same button

Hi, my character has got 2 hiting animations. When the player presses the attack button, play the first attack animation. When he presses a second time the attack button while the first animation is playing, play the second one.
I have put a if statement in another. Maybe a boolean " isPlaying " is possible. What do you think ?
Thank you.

function Start () {
	
	animation.Stop();
	
	animation.wrapMode = WrapMode.Loop;
	
	var hit1 = animation["hit1"];
	hit1 = WrapMode.Once;
	hit1 = 1;
	
	var hit2 = animation["hit2"];
	hit2 = WrapMode.Once;
	hit2 = 2;
	
}
	
function Update () {

	
	if(Input.GetButtonDown("attack")) {
	
	animation.Play ("hit1");
	
		if(Input.GetButtonDown("attack")) {
			
			animation.Play ("hit2");
			
			
		}
	}

}

Edit: Found a better way. I don’t know if this is the best solution, but it works i think. Not tested though.

var firstHit : boolean = true; // So the button is not pressed several times.
var responseTime : float = 0.3F; // response time, so you don't doublehit even you don't hit twice
var TimeOfDoubleHit : float = 2F; // For how long can you wait before hitting the button for the second time.
var counter : int = 0;
var hits = new Array ("hit1","hit2","hit3");

function Update () {

   	if(Input.GetKey(KeyCode.A)) {
      	if (firstHit && counter < 3) {
           	firstHit = false;
			   animation.Play (hits[counter]);
			   if (counter == 0) {
           		StartTimer();
           	}	
            ResponseTime();
           	counter++;
		}
	}
}

function ResponseTime() {
    yield WaitForSeconds(responseTime);
    firstHit = true;
}

function StartTimer() {
    yield WaitForSeconds(TimeOfDoubleHit);
    counter = 0;
}