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//鸭子补丁的实现

//在js里模拟纯虚拟继承implement

Function.prototype.implementsFor = function (parentClassObject){

if(parentClassObject.constructor === Function){

//正常继承

this.prototype = new parentClassObject();

this.prototype.constructor = this;

this.prototype.parent = parentClassObject.prototype;

}else{

//纯虚拟继承

this.prototype = parentClassObject;

this.prototype.constructor = this;

this.prototype.parent = parentClassObject;

}

return this;

}

//享元模式就是通过继承实现代码复用