//父構造函數
function Parsent(name.age){
    this.name = name;
    this.age = ahe;
}
Parsent.prototype.say = function(){
	console.log("大家好,我是"+this.name);
};
function Child(name,age,job){
	Parsent.apply(this,arguments);
	this.job = job;
}
//這種方法不可取,因為這是傳址,子父類會互相影響
// Child.prototype = Parsent.prototype;
				
//下面的方法可以解決繼承過程中子類與父類方法會互相影響的問題
function Temp(){}   //新建一個空的構造函數
Temp.prototype = Parsent.prototype;
Child.prototype = new Temp();
Child.prototype.constructor = Child;
Child.prototype.eat = function(){
	console.log("我要吃飯")
}
var child = new Child("zs",13,"student");
console.log(child.name,child.age,child.job);
Child.prototype.say = function(){
	console.log("我是child");
}
child.say();
child.eat();
var parsent = new Parsent("kt",20);
parsent.say();

面向對象-原型的繼承