<text>倒计时：{{content}}</text>

Page({

  /**

   * 页面的初始数据

   */

  data: {

    endTime: '',

    content:''

  },

  /**

   * 生命周期函数--监听页面加载

   */

  onLoad: function (options) {

    var that=this;

    that.setData({

      endTime:''

    })

    that.countdowm();

  },

  countdowm: function (e) {

    let that = this;

    let timer = setInterval(function () {

      let nowTime = new Date();

      let endTime = new Date(that.data.endTime * );

      let t = endTime.getTime() - nowTime.getTime();

      if (t > ) {

        let day = Math.floor(t / );

        let hour = Math.floor((t / ) % );

        let min = Math.floor((t / ) % );

        let sec = Math.floor((t / ) % );

        hour = hour <  ? "" + hour : hour;

        min = min <  ? "" + min : min;

        sec = sec <  ? "" + sec : sec;

        let format = '';

        if (day > ) {

          format = `${day}天${hour}时${min}分${sec}秒`;

        }

        if (day <=  && hour > ) {

          format = `${hour}时${min}分${sec}秒`;

        }

        if (day <=  && hour <= ) {

          format = `${min}分${sec}秒`;

        }

        that.setData({

          content: format

        })

      } else {

        clearInterval(timer);

        that.setData({

          content: '结束了！'

        })

      }

    }, );

  }
})