contextCheck.js

var Thing = function(){
  
  var _this = this;
  
  this.checkContext = function(){
    console.group()
    console.log('Checking context.....');
    console.log('this', this); // Outputs - Thing
    $(window).on('check-context', function(){
      console.log('inside window listener callback without context binding');
      console.group()
      console.log('this', this); // Outputs - Window
      console.log('$(this)', $(this)); // Outputs - $(window);
      console.log('_this', _this); // Outputs - Thing
      console.log('Done checking context');
      console.groupEnd();
      console.groupEnd();
      $(window).off('check-context');
    });
    $(window).trigger('check-context');
  };
  
  this.checkBoundContext = function(){
    console.group()
    console.log('Checking bound context.....');
    console.log('this', this); // Outputs - Thing
    $(window).on('check-bound-context', function(){
      console.log('inside window listener callback with context binding');
      console.group()
      console.log('this', this); // Outputs - Thing
      console.log('$(this)', $(this)); // Outputs - $(Thing);
      console.log('_this', _this); // Outputs - Thing
      console.log('Done checking bound context');
      console.groupEnd();
      console.groupEnd();
      $(window).off('check-bound-context');
    }.bind(this));
    $(window).trigger('check-bound-context');
  };
};

var t = new Thing();

t.checkContext();
t.checkBoundContext();