Li Zhan's nectar Model

var object = {    isA: function(aType) {        var self = this;        while (self) {            if (self == aType) {                return true;            }             self = self.Type;        };        return false;    }    };function Class(aBaseClass, aClassDefine) {    function class_() {        this.Type = aBaseClass;        for (var member in aClassDefine) {            this[member] = aClassDefine[member];        }     };    class_.prototype = aBaseClass;    return new class_()};function New(aClass, aParams) {    function new_() {        this.Type = aClass;        if (aClass.Create)             aClass.Create.apply(this, aParams);    };    new_.prototype = aClass;    return new new_();};var Person = Class(object, {    Create: function(name, age) {        this.name = name;        this.age = age;    },    SayHello: function() {        alert('Hello, I am ' + this.name + ', ' + this.age);    }});var Employee = Class(Person, {    Create: function(name, age, salary) {        Person.Create.call(this, name, age);        this.salary = salary;    },    ShowMeTheMoney: function() {        alert(this.name + ' $ ' + this.salary);    }});var BillGates = New(Person, ['Bill Gates', 53]);var SteveJobs = New(Employee, ['Steve Jobs', 53, 1234]);BillGates.SayHello();SteveJobs.SayHello();SteveJobs.ShowMeTheMoney();var LittleBill = New(BillGates.Type, ['Little Bill'], 6);LittleBill.SayHello();alert(BillGates.isA(Person));alert(BillGates.isA(Employee));alert(SteveJobs.isA(Person));alert(Person.isA(Employee));alert(Employee.isA(Person));

Class inheritance, another implementation method, is quite good, has a good idea, and is worth learning.