How to make my Player take damage from prefab?

Questions & Answers
1

var curHealth = 100;
var maxHealth = 100;
var healthtext : GUIText;
var HitDamage : boolean;
var deathbomb : GameObject;

function OnControllerColliderHit(hit: ControllerColliderHit){

	if(hit.gameObject.name == "Enemy");
	{
		HitDamage == true;
		curHealth -= 10;
	}
	
function Update(){
	healthtext.text = "Health " + curHealth + " / " + maxHealth;
		if(curHealth <=0){
			Destroy(gameObject);
			}
	}
}
2

There are many many syntax errors in your script. Read your script like the computer would

line 10 :

if(hit.gameObject.name == "Enemy");

your semicolon closes the if statement, so nothing happens after that, and lines 11-15 would be considered an error. No semicolon after the conditional of an if statement.

line 12 :

HitDamage == true;

== is used to check if something is equal to, to make something equal something else, just use one equals sign.

line 17 :

healthtext.text = "Health " + curHealth + " / " + maxHealth;

UI don’t use Unity GUI so am not sure if you can pass an int to a string this way, I assume not. TO convert something to a string, use .ToString()

Curly Braces :

Your ControllerCollider function doesn’t have the closing curly braces until after your Update function. Make sure each function is enclosed between {}

Declaring variables :

var curHealth = 100;

this is a personal thing as unity can fix this for you when compiling, but you should really typecast all your variables. That also proves you know what a variable is and how it can be interacted with. use

var curHealth : float = 100; or var curHealth : int = 100;

So I have editedyour script with these considerations. Please take the time to read it and yours, discover the differences and learn from it.

var curHealth : int = 100;
var maxHealth : int = 100;
var healthtext : GUIText;
var HitDamage : boolean;
var deathbomb : GameObject;


function OnControllerColliderHit( hit: ControllerColliderHit )
{
	Debug.Log( "Controller hit : " + hit.gameObject.name ); // what did the controller collide with?
	
	if ( hit.gameObject.name == "Enemy" ) // if is equal to
	{
		HitDamage = true; // equals
		curHealth -= 10;
	}
}
	
function Update()
{
	healthtext.text = "Health " + curHealth.ToString() + " / " + maxHealth.ToString(); // ToString()
	
	if ( curHealth <= 0 )
	{
		Destroy( gameObject );
	}
}