当修改对象的属性时,能否执行其它语句（有例子)?
下面的代码运行良好

Perl code

function A(text,value){    var num=0;    this.GetNum=function(){return num;};    this.AddNum=function(){++num;}    this.Text=text;    this.Value=value;}   var obj=new A("Hi","World");   var num;      obj.AddNum();   num=obj.GetNum();//此时num应为1;   obj.AddNum();   num=obj.GetNum()；//此时num应为2;

怎样写JavaScript,达到下面这样的效果:

Perl code

    var obj=new A("Hi","World");       obj.Text="Hello";//这一句执行完后num自动加一（用 = 赋值时能执行其它语句）    num=obj.GetNum();//此时num应为1;

[解决办法]
可以参考
http://articles.sitepoint.com/print/javascript-objects
的代码

onpropertychange
[解决办法]
用属性不好监控，改成调用方法吧

JScript code

    function A(text,value)    {        var num=0;        this.GetNum=function(){return num;};        this.AddNum=function(){++num;}        this.SetText = function(txt){  this.Text = txt;  this.AddNum();};        this.Text=text;        this.Value=value;    }    var obj=new A("Hi","World");       obj.SetText("Hello");//这一句执行完后num自动加一（用 = 赋值时能执行其它语句）    num=obj.GetNum();//此时num应为1;