en.javascript.info/1-js/7-js-misc/3-setTimeout-setInterval/9-throttle/_js.view/solution.js

function throttle(func, ms) {

  var isThrottled = false,
    savedArgs,
    savedThis;

  function wrapper() {

    if (isThrottled) {
      savedArgs = arguments;
      savedThis = this;
      return;
    }

    func.apply(this, arguments);

    isThrottled = true;

    setTimeout(function() {
      isThrottled = false;
      if (savedArgs) {
        wrapper.apply(savedThis, savedArgs);
        savedArgs = savedThis = null;
      }
    }, ms);
  }

  return wrapper;
}