工具函数封装：时分秒转时间戳、时间戳转时分秒

 时间戳转时分秒：

// 格式化时间 
export const formatTime = (time) => {
  let hours = Math.floor(time / 3600);
  let min = Math.floor((time % 3600) / 60);
  let s = parseInt(time % 3600) % 60;
  let hh = hours < 10 ? '0' + hours : hours;
  let mm = min < 10 ? '0' + min : min;
  let ss = s < 10 ? '0' + s : s;
  return hh + ":" + mm + ":" + ss;
}

时分秒转时间戳：

  /**
   * 获取时间回调
   */
  const onChangeTimer = (time, timeString) => {
    console.log(time, timeString);
    // sendtime = timeString;
    if (timeString !==null) {
      let hour = timeString.split(":")[0];
      let min = timeString.split(":")[1];
      let sec = timeString.split(":")[2];
      sendtime = Number(hour * 60 * 60 ) + Number(min * 60) + Number(sec);
    }
  }