Countdown by pressing a button - button

Question

How can I add a countdown in this script, by pressing the left mouse button? Every click counts minus 1. 10,9,8,7,6,5,4,3,2,1,0 example? This currently does not work in this script, and I do not understand the problem.
#pragma strict
var myTrigger : GameObject;
var myObject : GameObject;
var countAmmo : int = 10 ;
private var score : int = 10;
var guiScore : GUIText;
function Start ()
{
guiScore.text = "Score: 10";
}
function Update()
{
if(Input.GetButtonDown("Fire1"))
countAmmo = countAmmo -1;
score = countAmmo -1;
if(countAmmo == 0)
if(score == -1)
{
myObject.SetActive(false);
}
else
{
guiScore.text = "Score: -1";
myObject.SetActive(true);
}
}

Answer 1

I don't know exactly which language this is or in which context you are trying to achieve that, but looking at your code it seems that its only a problem with some brackets in your if-clauses. Try it, no guarantee that it's working.
#pragma strict
var myTrigger : GameObject;
var myObject : GameObject;
var countAmmo : int = 10 ;
private var score : int = 10;
var guiScore : GUIText;
function Start ()
{
guiScore.text = "Score: 10";
}
function Update()
{
if(Input.GetButtonDown("Fire1"))
{
countAmmo = countAmmo -1;
score = countAmmo -1;
guiScore.text = "Score: " + score.ToString();
if(countAmmo <= 0)
{
if(score == -1)
{
myObject.SetActive(false);
} else {
guiScore.text = "Score: -1";
}
myObject.SetActive(true);
}
}
}

Answer 2

This line:
guiScore.text = "Score: -1";
Should be:
guiScore.text = "Score:" + score;

Answer 3

#pragma strict
var myTrigger : GameObject;
var myObject : GameObject;
var countAmmo : int = 10 ;
private var score : int = 10;
var guiScore : GUIText;
function Start ()
{
guiScore.text = "Score: " + score.toString();
}
function Update()
{
if(Input.GetButtonDown("Fire1"))
countAmmo--;
score = countAmmo - 1;
if(countAmmo == 0)
{
if(score == -1)
{
myObject.SetActive(false);
}
else
{
guiScore.text = "Score: " + score.ToString();
myObject.SetActive(true);
}
}
}