JS OOP calling a method from the constructor

How do I call a method from inside my class' constructor in JavaScript?

I have the following Class:

function Aclass(){
    this.classValues = this.classMethod.call();
}
Aclass.prototype.classMethod = function(){
    return 'Hello World';
}

I initialize the class:

var test = new Aclass();

I get the following error:

Aclass.prototype.classMethod is 开发者_如何学编程undefined

I'm a newbie with JS OOP and would really appreciate a nudge in the right direction.

Thanks.

Did you put the line

var test = new Aclass();

Before the rest of your code? That would result in the error you described.