How do I make my melee script do damage.

I have a melee script but I don't know how to make it do damage to either an ai or a player here is the script so far it is in js. var target : Transform; function Update () { var dist : float = Vector3.Distance(transform.position, target.position); if(Input.GetKeyUp(KeyCode.Mouse0) && dist <= 2.1){ GetComponent.().Play("Default Take"); } if(Input.GetKeyUp(KeyCode.Mouse0) && dist > 2.1){ GetComponent.().Play("Default Take"); } }