Do KONAMI up up down down left right left right b a

konami.js

function(){
//Konami magic
var code=[38,38,40,40,37,39,37,39,66,65], konamiStep=0;
window.addEventListener("keydown", function(event) {
    if(event.keyCode==code[konamiStep]){konamiStep++;}else{konamiStep=0;} 
    if(konamiStep==code.length){
        //KONAMI MAGIC HERE
    konamiStep=0;
    }
}, false);
})();