contextuality.js

$(document).ready(function(){
   //It is important to notice that 'button' is a DOM object with various methods
  $('button').on('click', function(){
     //We must preserve the button's context
     var that = this;
     bluezy();
     function bluezy(){
       //We're saying, "I want to do fun things with <<that>> button object, 
      //not <<this>> window object you keep giving me
       $(that).css("background-color", "blue"); 
        console.log(this); // >> Window
        console.log(that);// >> <button>
     }   
  });  
});