/**
 * js睡眠函数
 * @param numberMillis {number} 毫秒值
 * @returns {boolean}
 */
function sleep (numberMillis) {
  let now = new Date();
  let exitTime = now.getTime() + numberMillis;
  while (true) {
    now = new Date();
    if (now.getTime() > exitTime)
      return true;
  }
}
JS睡眠函数
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