Page({
  onShow() {
    let that = this;
    var dates = {datetime : [{dat: 0,name:'zs'},{dat: 6,name:'ls'},{dat: 10,name:'ww'}]}
    // console.log(dates) //数据
    let len = dates.datetime.length; //时间数据长度
    function get000Count() {
      var count = 0;
      for (var i = 0; i < len; i++) {
        if (dates.datetime[i]['dat'] == 0) {
          count = count + 1;
        }
      }
      return count;
    }
    function nowTime() { //时间函数
      for (var i = 0; i < len; i++) {
        var intDiff = dates.datetime[i].dat; //获取数据中的时间戳
        //console.log(intDiff)
        var day = 0,
          hour = 0,
          minute = 0,
          second = 0;
        if (intDiff > 0) { //转换时间
          day = Math.floor(intDiff / (60 * 60 * 24));
          hour = Math.floor(intDiff / (60 * 60)) - (day * 24);
          minute = Math.floor(intDiff / 60) - (day * 24 * 60) - (hour * 60);
          second = Math.floor(intDiff) - (day * 24 * 60 * 60) - (hour * 60 * 60) - (minute * 60);
          if (hour <= 9) hour = '0' + hour;
          if (minute <= 9) minute = '0' + minute;
          if (second <= 9) second = '0' + second;
          dates.datetime[i].dat--;
          var str = hour + ':' + minute + ':' + second
          //console.log(str)  
        } else {
          //var str = '已结束！';
          var str = '00:00:00';
          if (get000Count() == len) {
            console.log(get000Count())
            clearInterval(timer);
          }
        }
        dates.datetime[i].difftime = str; //在数据中添加difftime参数名，把时间放进去
      }
      that.setData({
        wearList: dates
      })
    }
    //nowTime();
    var timer = setInterval(nowTime, 1000);
  },
})

<view wx:for="{{wearList.datetime}}" wx:for-item="item" wx:key="id">
 <view class='dates'>{{item.difftime}}</view>
 <view class='dates'>{{item.name}}</view>
</view>