How to refer to another variable in JS Unity3d?

Question

Unity

I want that when I go into the trigger, and I press the E button, the animation should play.
If I went into the trigger hz should be 2, and when it is 2 then HD from another variable should be 4.
Here is 1

var hz = 1;

function OnTriggerEnter (col:Collider) {

hz ++;

if(hz == 2){
asd.hd ++;
}

if(Input.GetKeyDown ("e")){
}

if(col.tag == "Player"){
}
}

Here are 2

public var hd = 3;

function UpDate(){
  
if(hd == 4){
 animation.Play("Button");
  }  
  
}

Answer 1

It ?