foo = function() {
    a = 1;
 };

 bar = function() {
    a = 1;
 };

 if (foo === bar) alert('baz');
 if (foo == bar) alert('qux');

var foo = function() {
    a = 1;
 };

 var bar = function() {
    a = 1;
 };

alert(foo.toString() == bar.toString());​

function baz(myInt) { return 3 + myInt; }
function asd(a) { return 3 + a; }

var foo = baz;
foo(1); //returns 4

var bar = baz;
bar(3); //returns 6

foo === bar; //true

bar = asd;
bar(3); //returns 6

foo === bar; //false