How `this` works in browser JS

gistfile1.js

console.log(this); // => window (the global object)

var myObject = {};

function foo() {
    console.log(this);
}

foo(); // => window
foo.call(myObject); // => myObject

myObject.foo = foo;

myObject.foo(); // => myObject

var fooReference = myObject.foo;

fooReference(); // => window

context == containing object

"the key is just that the context is bound at call time. It doesn't follow the function around."