JavaScript: get object instances to contain extended variables

So, say I had the following script:

var hey = {
    foo: 1,
    bar: 2,
    baz: 3,
    init: function(newFoo){
        this.foo = newFoo;
        return this;
    }
}
hey.check = function(){
    alert('yeah, new function');
}

Basically, I can call new hey.init(999) and get a new hey variable with hey.foo set to 999. But when I do that, hey.init(999).check() is no longer defined. Is there a way to mimic the script, but allow开发者_如何转开发 new hey's to have the extended variables/functions?

EDIT: changed hey.check() to hey.init(999).check() sorry about that...

What you are doing is not actually getting a new hey instance, but a hey.init instance, which only contains foo property.

I think this is what are you trying to do:

var hey =function() {
    this.foo = 1;
    this.bar = 2;
    this.baz = 3;
    this.init = function(newFoo){
        this.foo = newFoo;
    }
}
hey.check = function(){
    alert('yeah, new function');
}


//now instantiating our class, and creating an object:
var heyInstance=new hey();
heyInstance.init(999);
alert(heyInstance.foo);

It works for me...

When I paste

var hey = {
    foo: 1,
    bar: 2,
    baz: 3,
    init: function(newFoo){
        this.foo = newFoo;
        return this;
    }
}
hey.check = function(){
    alert('yeah, new function');
}
console.log(hey);
hey.init(22);
console.log(hey);
hey.check();

into Firebug's console, I end up with an alert from hey.check(); and the second log shows an object where foo == 22.

What's not working on your end?