javascript 面向对象,实现namespace,class,继承，重载_js面向对象

Namespace = new Object();
Namespace.register = function(fullname){
try
{
var nsArray = fullname.split(".");
var strNS = "";
var strEval = "";
for(var i=0;iif(strNS.length >0)
strNS += ".";
strNS += nsArray[i];
strEval += " if(typeof("+ strNS +") =='undefined') " + strNS + " = new Object(); ";
}
if(strEval != "") eval(strEval);
}catch(e){alert(e.message);}
}

//注册命名空间
Namespace.register("MyCompany");
//1.类:雇员
MyCompany.Employee = function(empName){
this.Name = empName;
this.Salary = 1000;
this.Position = "cleaner";
}
MyCompany.Employee.prototype.ShowName = function(){
return "I'm "+this.Name+",my salary is $" + this.Salary;
}
MyCompany.Employee.prototype.Work = function(){
return "I'm a "+ this.Position +",I'm cleaning all day!"
}
//2.类:程序员
MyCompany.Developer = function(empName){
//继承父类属性
MyCompany.Employee.call(this,empName);
//覆盖父类属性
this.Position = "developer";
//扩展属性
this.Technology = "C#";
}
//继承父类原型方法
MyCompany.Developer.prototype = new MyCompany.Employee();
//覆盖父类方法
MyCompany.Developer.prototype.Work = function(){
return "I'm a "+ this.Position +",i'm good at "+ this.Technology +",i'm coding all day!"
}