simple klass method to provide OO feature in JS

gistfile1.js

var Animal = Klass({
  init:function(name){
    this.name = name;
  },
  pow:function(){
    console.log('pow function is animal only '+this.name);
  }
});

var Person = Klass({
  init:function(name,sex){
    this.name = name;
    this.sex = sex;
  },
  speak:function(){
    console.log(this.name)
  },
  lose:function(){
    console.log('another method');
  }
},Animal);



function Klass(pros,parent){
  var child ;
  parent = parent || Object;
  child = function(){
    parent.apply(this,arguments);
    pros.init.apply(this,arguments);
  }
  child.prototype = new parent();
  for(var i in pros){
    if(i != 'init'){
      if(pros.hasOwnProperty(i)){
        child.prototype[i] = pros[i];
      }
    }
  }
  return child;
}
var cat = new Animal('lily');
var viking = new Person('v','male');
viking.pow();
viking.speak();
console.log(viking instanceof Person)
console.log(viking instanceof Animal)
console.log(cat instanceof Person)