Showing that this keyword is referencing executing context

firefox.log

red
red
green
yellow
red

node.log

blue
red
green
yellow
red

this-function.js

var color = 'blue';
this.color = 'red';

console.log( color );               // blue
console.log( this.color );          // red

(function ( global ){
    
    var color = 'green';
    this.color = 'yellow';

    console.log( color );           // green
    console.log( this.color );      // yellow
    console.log( global.color );    // red
    
}( this ));