debounce.js

let debounce = function (eventName, time, fn) {
  // locker
  let locker = function () {
    let isLocked = false;
    let unlock = function (boolLock, fn) {
      setTimeout(function () {
        isLocked = false;
        fn();
      },time);
    };
    return {
      lock(fn) {
        fn();
        unlock(isLocked, fn);
        return isLocked = true;
      },
      isLocked() { return isLocked; }
    };
  }();
  //
  let {isLocked, lock} = locker;
  window.addEventListener(eventName, function () {
    if (!isLocked()) { return lock(fn); }
  });
};