javascript game basics.

game.js

var hit_enemy = function(enemy, weapon) {
    if(enemy.state == "alive") {
        enemy.health = enemy.health - weapon.damage;
        console.log("hit!", enemy.health);   

        if(enemy.health <= 0) {
            console.log("it died");
            enemy.state = "dead";
        }     
    }
    else {
        console.log("its already dead");        
    }
}

var player1 = {name: "bob", health: 40};
var sword = {name: "laser sword", damage: 6};

player1.weapon = sword;

var enemy1 = {name: "skeletor", health: 14, state: "alive"};

hit_enemy(enemy1, player1.weapon);
hit_enemy(enemy1, player1.weapon);
hit_enemy(enemy1, player1.weapon);
hit_enemy(enemy1, player1.weapon);

What is this?