//对象克隆function object(o){function F(){}F.prototype = o;return new F();}//原型继承function inheritPrototype(subType,superType){var prototype = object(superType.prototype);prototype.constructor = subType;subType.prototype = prototype;} function SuperType(name){this.name = name;this.colors = [1,2];} SuperType.prototype.sayName = function(){alert(this.name);} function SubType(name,age){//属性继承SuperType.call(this,name);    this.age = age;} inheritPrototype(SubType,SuperType); //原型继承 SubType.prototype.sayAge = function(){alert(this.age);}