微信小程序中显示倒计时

微信小程序中显示倒计时，wxml文件中：

  
    
      {{countDownDay}}天
      {{countDownHour}}时
      {{countDownMinute}}分
      {{countDownSecond}}秒
    

js文件中：

Page( {
  data: {
    windowHeight: 654,
    maxtime: "",
    isHiddenLoading: true,
    isHiddenToast: true,
    dataList: {},
    countDownDay: 0,
    countDownHour: 0,
    countDownMinute: 0,
    countDownSecond: 0,
  },
  //事件处理函数
  bindViewTap: function() {
    wx.navigateTo( {
      url: '../logs/logs'
    })
  },
  onLoad: function() {
    this.setData( {
      windowHeight: wx.getStorageSync( 'windowHeight' )
    });
  },

  // 页面渲染完成后 调用
  onReady: function () {
    var totalSecond = 1505540080 - Date.parse(new Date())/1000;

    var interval = setInterval(function () {
      // 秒数
      var second = totalSecond;

      // 天数位
      var day = Math.floor(second / 3600 / 24);
      var dayStr = day.toString();
      if (dayStr.length == 1) dayStr = '0' + dayStr;

      // 小时位
      var hr = Math.floor((second - day * 3600 * 24) / 3600);
      var hrStr = hr.toString();
      if (hrStr.length == 1) hrStr = '0' + hrStr;

      // 分钟位
      var min = Math.floor((second - day * 3600 *24 - hr * 3600) / 60);
      var minStr = min.toString();
      if (minStr.length == 1) minStr = '0' + minStr;

      // 秒位
      var sec = second - day * 3600 * 24 - hr * 3600 - min*60;
      var secStr = sec.toString();
      if (secStr.length == 1) secStr = '0' + secStr;

      this.setData({
        countDownDay: dayStr,
        countDownHour: hrStr,
        countDownMinute: minStr,
        countDownSecond: secStr,
      });
      totalSecond--;
      if (totalSecond < 0) {
        clearInterval(interval);
        wx.showToast({
          title: '活动已结束',
        });
        this.setData({
          countDownDay: '00',
          countDownHour: '00',
          countDownMinute: '00',
          countDownSecond: '00',
        });
      }
    }.bind(this), 1000);
  },

  //cell事件处理函数
  bindCellViewTap: function (e) {
    var id = e.currentTarget.dataset.id;
    wx.navigateTo({
      url: '../babyDetail/babyDetail?id=' + id
    });
  }
})

效果图：