JavaScript access parent object attribute

Question

I have a small issue in JS, I have two nested objects, and I would like to access a variable from the parent, like so:

var parent = {
    a : 5,

    child:          


        

Answer 1

You can use call to set the value of this:

parent.child.displayA.call(parent); // 5

You may also be interested in binding it:

parent.child.displayA = function(){
  console.log(this.a);
}.bind(parent);
parent.child.displayA(); // 5

Or you you can just use parent instead of this:

parent.child.displayA = function(){
  console.log(parent.a);
};
parent.child.displayA(); // 5