Function checkTime

src/common/util.js:28–32

()

  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();