寄生组合式继承是集寄生式继承和组合继承的优点于一身,是基于类型继承最有效的方式
function object(o){
function F(){};
F.prototype = o;
return new F();
}
function inheritPrototype(subType,superType){
var prototype = object(superType.prototype);
prototype.constructor = subType;
subType.prototype = prototype;
}
function SuperType(name){
this.name = name;
this.colors = ["red","yellow","green"];
}
SuperType.prototype.sayName = function(){
alert(this.name)
}
function SubType(name,age){
SuperType.call(this,name);
this.age = age;
}
inheritPrototype(SubType,SuperType);
SubType.prototype.sayAge = function(){
alert(this.age);
}
var person1 = new SubType("china",1);
console.log(person1.name); // "china"
console.log(person1.colors); // ["red","yellow","green"]
person1.sayAge(); // 1