Function debounce

src/common/util.js:23–48

(func, time)

}

export function debounce(func, time) {
  let startTime;
  let timer;
  let callback;
  time = Math.max(0, +time || 0);
  function checkTime() {
    timer = null;
    if (performance.now() >= startTime) callback();
    else checkTimer();
  }
  function checkTimer() {
    if (!timer) {
      const delta = startTime - performance.now();
      timer = setTimeout(checkTime, delta);
    }
  }
  function debouncedFunction(...args) {
    startTime = performance.now() + time;
    callback = () => {
      callback = null;
      func.apply(this, args);
    };
    checkTimer();
  }
  return debouncedFunction;
}

export function throttle(func, time) {
  let lastTime = 0;