从设置为原型的对象中调用属性

Question

var Foo = function() {
    this.message = "Hi";
}
Foo.prototype = {
    say: {
        hi: function() {
            console.log(this.message);
        }
    }
}

[edit]I know "this" in hi() refers say, is there any way to achieve this?

var he = new Foo();
he.say.hi(); //"Hi" to console

Answer 1

You can access like this.

var Foo = function(){
  this.par = 3;

  this.sub = new(function(t){ //using virtual function to create sub object and pass parent object via 't'
    this.p = t;
    this.subFunction = function(){
      alert(this.p.par);
    }
  })(this);
}

var myObj = new Foo();
myObj.sub.subFunction() // will popup 3;

myObj.par = 5;
myObj.sub.subFunction()

Answer 2

All you need is to bind the hi function just like this:

var Foo = function() {
    this.message = "Hi";
    this.say.hi = this.say.hi.bind(this);
}
Foo.prototype = {
    say: {
    hi: function() {
        console.log(this.message);
        }
    }    
}

var he = new Foo();
he.say.hi();