How to correctly refer from a child object to a parent object in javascript?

Question

JavaScript

There is a code in which the child object refers to the parent in this way

function JClass() {
  this.v = 1;
};
JClass.prototype = {
  newo:function(){
    var t=this;
    return {
      readv:function(){alert(t.v)}
    }
  }
};

new JClass().newo().readv();

Question: What is the correct way to get to the this of the desired object from the returned one. For example, without using an intermediary (var t)?

Answer 1

https://github.com/getify/You-Don't-Know-JS

function JClass() {
  this.v = 1;
};
JClass.prototype = {
  newo:function(){
    return {
      readv:()=>{alert(this.v)}
    }
  }
};
new JClass().newo().readv();