html - Javascript: Pause/Unpause javascript Tetris game -

i have started working off javascript tetris template , i've got stuck trying implement pause feature. trying create window.onkeydown function when button clicked game pause , toggle continue once clicked again.

here snippet of code

function get(id) {     return document.getelementbyid(id); };  function hide(id) {     get(id).style.visibility = 'hidden'; };  function show(id) {     get(id).style.visibility = null; };  function html(id, html) {     get(id).innerhtml = html; };  function timestamp() {     return new date().gettime(); };  function random(min, max) {     return (min + (math.random() * (max - min))); };  function randomchoice(choices) {     return choices[math.round(random(0, choices.length - 1))]; };  if (!window.requestanimationframe) { // http://paulirish.com/2011/requestanimationframe-for-smart-animating/     window.requestanimationframe = window.webkitrequestanimationframe ||         window.mozrequestanimationframe ||         window.orequestanimationframe ||         window.msrequestanimationframe ||         function (callback, element) {             window.settimeout(callback, 1000 / 60);         }  }  var ispaused = true;  window.requestanimframe = (function () {     return window.requestanimationframe ||         window.webkitrequestanimationframe ||         window.mozrequestanimationframe ||         function (callback) {             window.settimeout(callback, 1000 / 60);         }; })();  function start() {     if (ispaused) {         update();     }      requestanimframe(start); }  window.onkeydown = function () {     ispaused = !ispaused; // flips pause state  }; 

can point me in right direction?

you have keep reference on settimeout. like,

module.timeout = settimeout(callback, 1000/60); 

so when flip ispaused, clear both timeouts , restart them later when you're pausing them.

cleartimeout(module.timeout)