closure.js

var myClosure = function() {
    var date = new Date();
    var nested = function() {
        return date.getMilliseconds();
    };
    return {
        foo: nested
    };
};

var display = function () {
    var output = document.getElementById("Output");
    var closure = new myClosure();
    output.innerHTML = closure.foo();
    window.setTimeout(function () {
        output.innerHTML += "<br />" + closure.foo();
    }, 74);
};

display();