js模拟静态方法

//模拟静态

var Animal = function(name){

    this.name = name;

    Animal.instanceCounter ++;

};

Animal.instanceCounter = 0;

Animal.prototype.sayHellow = function(){

    console.log('this.name');

}

var animal = new Animal('name');

var animal2 = new Animal('name2');

console.log(Animal.instanceCounter);//

console.log(animal.instanceCounter);//undefined