<view class="TimeSeond">{{second}}</view>

Page({
  data: {
    tiem_one:'',
    second:'',//倒計時
    deadline:'',
  },
  onLoad(){
    this.countdown();
  },
  countdown(){
    let timestamp = Date.parse(new Date()) / 1000;//當前時間戳
    let time = this.addtime('2024-4-19 17:20:00');//當前時間轉時間戳
    if(time > timestamp){
      this.deadline = (time - timestamp) * 1000
      this.setData({
        deadline:this.deadline
      })
      this.single()
    }else{
      that.setData({
        second:'00:00'
      })
    }
  },
  addtime(time){
    let date = new Date(time);
    let minutes = date.getMinutes();
    date.setMinutes(minutes+30);//增加三十分鐘
    return Date.parse(date) / 1000;
  },
  single(e){
    var that = this
    var time = that.deadline,minutes,seconds;
    that.tiem_one = setInterval(function() {
      time = time - 1000
      minutes = parseInt((time % (1000 * 60 * 60)) / (1000 * 60));
      seconds = parseInt((time % (1000 * 60)) / 1000);
      if (time < 1) {
        that.setData({
          second:'00:00'
        })
        clearInterval(that.tiem_one)
        return false
      }
      minutes = minutes > 9 ? minutes : '0' + minutes
      seconds = seconds > 9 ? seconds : '0' + seconds
      that.setData({
        second:minutes + ':' + seconds
      })
    },1000)
  },
})