寄生组合式继承

//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);

}