function Person(firstName, lastName, age)
{
//私有變量：
var _firstName = firstName;
var _lastName = lastName;
//公共變量:
this.age = age;
//方法：
this.getName = function()
{
return(firstName + " " + lastName);
};
this.SayHello = function()
{
alert("Hello, I'm " + firstName + " " + lastName);
};
};
var BillGates = new Person("Bill", "Gates", 53);

　　//定義構(gòu)造函數(shù)
function Person(name)
{
this.name = name; //在構(gòu)造函數(shù)中定義成員
};
//方法定義到構(gòu)造函數(shù)的prototype上
Person.prototype.SayHello = function()
{
alert("Hello, I'm " + this.name);
};
//子類構(gòu)造函數(shù)
function Employee(name, salary)
{
Person.call(this, name); //調(diào)用上層構(gòu)造函數(shù)
this.salary = salary; //擴(kuò)展的成員
};
//子類構(gòu)造函數(shù)首先需要用上層構(gòu)造函數(shù)來(lái)建立prototype對(duì)象，實(shí)現(xiàn)繼承的概念
Employee.prototype = new Person() //只需要其prototype的方法，此對(duì)象的成員沒(méi)有任何意義！
//子類方法也定義到構(gòu)造函數(shù)之上
Employee.prototype.ShowMeTheMoney = function()
{
alert(this.name + " $" + this.salary);
};
var BillGates = new Person("Bill Gates");
BillGates.SayHello();
var SteveJobs = new Employee("Steve Jobs", 1234);
SteveJobs.SayHello();