/**
 * 函数防抖 
 * @param fn
 * @param delay
 * @returns {Function}
 * @constructor
 */
export const Debounce = (fn, t) => {
  let delay = t || 500;
  let timer;
  return function() {
      let args = arguments;
      if (timer) {
          clearTimeout(timer);
      }
      timer = setTimeout(() => {
          timer = null;
          fn.apply(this, args);
      }, delay);
  }
};


/**
1. 函数节流
2. @param fn
3. @param interval
4. @returns {Function}
5. @constructor
*/
export const Throttle = (fn, t) => {
  let last;
  let timer;
  let interval = t || 500;
  return function() {
      let args = arguments;
      let now = +new Date();
      if (last && now - last < interval) {
          clearTimeout(timer);
          timer = setTimeout(() => {
              last = now;
              fn.apply(this, args);
          }, interval);
      } else {
          last = now;
          fn.apply(this, args);
      }
  }
}