javascript中的继承-组合继承

连续两篇水文(javascript中的继承-原型链,javascript中的继承-借用构造函数),这种行为完全是充数,这里结合两者的优点介绍组合继承模式:

function SuperType(name){
       this.name=name;
       this.friends=["gay1","gay2"];
}
SuperType.prototype.sayName=function(){
       alert(this.name);
};
function SubType(name,age){
       SuperType.call(this,name);
       this.age=age;
}
SubType.prototype=new SuperType();
SubType.prototype.constructor=SubType;
SubType.prototype.sayAge=function(){
       alert(this.age);
};

var instance1=new SubType("nUll",25);
var instance2=new SubType("mywei",25);
instance1.friends.push("gay3");
alert(instance1.friends);    //gay1,gay2,gay3
instance1.sayName();       //nUll
instance1.sayAge();          //25

alert(instance2.friends);    //gay1,gay2
instance2.sayName();       //mywei
instance2.sayAge();          //25
alert(instance1 instanceof SuperType);    //true
alert(SuperType.prototype.isPrototypeOf(instance1));  //true

这里再简单的总结两句:加上我刚才说的那句.我已经说完了.