Class enemy in javascript help

I can do in javascript as an object "enemy" that has "health", "speed" and "stamina". and to delete the object, or several at once??

class enemy {

health = 100
speed = 10
stamina = 200

}

for 0 to 10
{
enemyBig = new Enemy ()
}

if keydown (space)
{

delete all.enemyBig

}

How would this code in javascript corretly?

THANKS!

this would more or less do it in Unity

First file:

Enemy.js

var health : float = 100;
var speed : float = 10;
var stamina : float = 200;

Second file: Spawner.js

function Start()
{
   for (var i : int = 0; i < 10; i++ )
   {
       var go : GameObject = new GameObject();
       go.AddComponent(Enemy);
       go.name = "Enemy " + i;
   }
}

function DeleteAll()
{
   var enemies = FindObjectsOfType(Enemy);
   for (var e : Enemy in enemies)
   {
       Destroy(e.gameObject);
   }
   Destroy(gameObject);
}

function Update()
{
   if (Input.GetKeyDown(KeyCode.Space)) DeleteAll();
}

Create an empty GameObject and drag spawner into it