html
 

  <view class="countdown">  <text>倒计时：</text>  <text wx:for="{{countdown}}" wx:key="index">{{item}}</text>  </view>

ts
 

 data: {countdown: [], // 存放倒计时数组  targetTime: '', // 目标时间戳  intervalId: null, // 定时器ID 
}
startCountdown () {  const that = this;  // 每秒更新一次倒计时  this.data.intervalId = setInterval(function () {  const now = new Date().getTime();  const diff = that.data.targetTime - now;  if (diff <= 0) {  // 倒计时结束，清除定时器  clearInterval(that.data.intervalId);  that.setData({  countdown: ['倒计时结束'],  });  } else {  // 计算剩余的天、时、分、秒  const days = Math.floor(diff / (1000 * 60 * 60 * 24));  const hours = Math.floor((diff % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));  const minutes = Math.floor((diff % (1000 * 60 * 60)) / (1000 * 60));  const seconds = Math.floor((diff % (1000 * 60)) / 1000);  that.setData({  countdown: [days, '天', hours, '时', minutes, '分', seconds, '秒'],  });  }  }, 1000);     },onLoad: function (options) {   this.setData({  targetTime: new Date('2024-04-28 16:53:10').getTime(),  });  this.startCountdown();  }