pickup weapon with GetComponent

how to call a function with GetComponent?

example script: weaponprefab

 var curWeapon : Transform;
 
 function update()
 {
     curWeapon.GetComponent(Weaponindexweapon);
     if (if Input.GetKeyDown("E"))
     {
         curWeapon.ChangeShot(blah);
         curWeapon.ChangeWeapon(blah);
     }
 }

example script. Weaponindexweapon

 function ChangeShot()
 {
     blah blah blah
 }

 function ChangeWeapon()
 {
     blah blah blah
 }