<script>
function Enemy() { 
  this.level = 50; 
  console.log("Enemy constructor"); 
}
Enemy.prototype.attack_play = function(){
  console.log("attack_play");
};
Enemy.prototype.wudiai = 100;
Enemy.wudiai = "1213";
Enemy.gongji = function(){
  console.log("gongji  asasasd "+ Enemy.wudiai);
}
function BossEnemy(){
  Enemy.call(this);
  console.log("Boss constructor");
}
// 寫法1
// BossEnemy.prototype = {constructor: BossEnemy,};
// for(var i in Enemy.prototype){
//   BossEnemy.prototype[i] = Enemy.prototype[i];
// }
// 寫法2
var a = function (){};
a.prototype = Enemy.prototype;
BossEnemy.prototype = new a();
BossEnemy.prototype.boss_attack = function(){
  console.log("boss_attack");
};
BossEnemy.staticFunc = function(){
  console.log("staticFunc called!");
};
var bos = new BossEnemy();
bos.boss_attack();
bos.attack_play();
BossEnemy.staticFunc();
console.log("==========================");
BossEnemy.prototype.attack_play = function(){
  Enemy.prototype.attack_play.call(this);
  console.log("BossEnemy attack play!");
}
bos.attack_play();
console.log("*****************************");
// 寫法三 js6
class BingEnemy extends Enemy{
  constructor(){
    super();
    this.flag = true;
    this.name = "通天教主";
    this.level = 100;
  }
  static staticFunc(){
    console.log("static func called!");
  }
  get BingName(){
    return this.name;
  }
  set BingName(value){
    this.name = value;
  }
};
BingEnemy.haha ="123";
let bing = new BingEnemy();
console.log(bing);
BingEnemy.staticFunc();
bing.attack_play();
console.log(bing.BingName);
bing.BingName = "jade";
console.log(bing.BingName);
//console.log(BingEnemy.wudi);
console.log("============================");
</script>