wxml:

<view class='name' wx:if="{{countDown}}">
      <view class='name_left'>FENDI</view>
      <view class='name_right'>活动结束:{{day}}天 <text>{{hou}}</text>:<text>{{min}}</text>:<text>{{sec}}</text></view>
</view>

xss:

.name_right{width:400rpx;font-size:24rpx;color:#F9524A;text-align:right;}
.name_right text{background:#F9524A;border-radius:6rpx;color:#fff;padding:2rpx 6rpx;}

js:

data: {
    endTime: '2018-11-22 10:40:30'//2018/11/22 10:40:30这种格式也行
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    var that = this;
    that.countDown()
  },
// 倒计时
  countDown:function(){
    var that=this;
    var nowTime = new Date().getTime();//现在时间(时间戳)
    var endTime = new Date(that.data.endTime).getTime();//结束时间(时间戳)
    var time = (endTime-nowTime)/1000;//距离结束的毫秒数
    // 获取天、时、分、秒
    let day = parseInt(time / (60 * 60 * 24));
    let hou = parseInt(time % (60 * 60 * 24) / 3600);
    let min = parseInt(time % (60 * 60 * 24) % 3600 / 60);
    let sec = parseInt(time % (60 * 60 * 24) % 3600 % 60);
    // console.log(day + "," + hou + "," + min + "," + sec)
    day = that.timeFormin(day),
    hou = that.timeFormin(hou),
    min = that.timeFormin(min),
    sec = that.timeFormin(sec)
    that.setData({
      day: that.timeFormat(day),
      hou: that.timeFormat(hou),
      min: that.timeFormat(min),
      sec: that.timeFormat(sec)
    })
    // 每1000ms刷新一次
    if (time>0){
      that.setData({
        countDown: true
      })
      setTimeout(this.countDown, 1000);
    }else{
      that.setData({
        countDown:false
      })
    }
  },
  //小于10的格式化函数(2变成02)
  timeFormat(param) {
    return param < 10 ? '0' + param : param;
  },
  //小于0的格式化函数(不会出现负数)
  timeFormin(param) {
    return param < 0 ? 0: param;
  },

主要是,获取当前日期转换为时间戳 和把结束时间转为时间戳:

var nowTime = new Date().getTime();//现在时间(时间戳)
var endTime = new Date(that.data.endTime).getTime();//结束时间(时间戳)

 

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