public properties

[josh]

Hi If I have

function obj()
{
this.id;


function init()
{
this.id = 100;
}
}

and then:

var o = new Obj();

o.id; // print me undefined

why? private methods cannot access public properties?

 

[kindy]

init in the obj doesn't called.
- - - - - - - - -
function Obj(){
this.id;
function init(){
this.id = 100;
}
init.call(this);
}
var o = new Obj();
o.id;
- - - - - - - - -
and, i don't know why

init.call(this)

can't write as

init();

 

[josh]

init in the obj doesn't called.
- - - - - - - - -
function Obj(){
this.id;
function init(){
this.id = 100;
}
init.call(this);}

var o = new Obj();
o.id;
- - - - - - - - -
and, i don't know why

init.call(this)

can't write as

init();

yes sorry I've forgotten to write it:

function obj()
{
this.id;

function init()
{
this.id = 100;
}

init();
}

however the this is undefined because in the private function the
this keyword refers to the Window object! and not to the object in
which I'm staying to operate with.

Regards

 

[kindy]

yes sorry I've forgotten to write it:

function obj()
{
this.id;

function init()
{
this.id = 100;
}

init();

}

however the this is undefined because in the private function the
this keyword refers to the Window object! and not to the object in
which I'm staying to operate with.

the keyword this in a function will be always refers to the window,
unless:
1. function is invoked by call(obj) or apply(obj);
2. you assign function to an object's property, and then invoke it
like obj.fnName()


function Obj(){
function init(){
this.id= 100;
}
this.t= init;
this.t();
delete this.t;
}
- - - - - - - - -
function Obj(){
function init(){
this.id= 100;
}
init.call(this);
}
- - - - - - - - -
function Obj(){
var _this= this;
function init(){
_this.id= 100;
}
init();
}
- - - - - - - - -
function Obj(){
this.init();
}
Obj.prototype.init= function(){
this.id= 100;
};

 

[kindy]

the keyword this in a function will be always refers to the window,
unless:
1. function is invoked by call(obj) or apply(obj);
2. you assign function to an object's property, and then invoke it

3. new fnName()