小程序计时器

<view class="container"> {{timecount}}</view>
<button   bindtap='start'>开始</button>
<button   bindtap='stop'>暂停</button>
<button   bindtap='Reset'>停止</button>

var intt;
Page({
  data: {
    hour: 0,
    minute: 0,
    second: 0,
    millisecond: 0,
    timecount: '00:00:00',
    cost: 0,
    flag: 1,
    endtime: "",
  },
  onLoad: function () {
  },
  //开始
  start: function () {
    var that = this;
    //停止（暂停）
    clearInterval(intt);
    //时间重置
    that.setData({
      hour: 0,
      minute: 0,
      second: 0,
      millisecond: 0,
    })
    intt = setInterval(function () { that.timer() }, 50);
  },
  //暂停
  stop: function () {
    clearInterval(intt);
  },
  //停止
  Reset: function () {
    var that = this
    clearInterval(intt);
    that.setData({
      hour: 0,
      minute: 0,
      second: 0,
      millisecond: 0,
      timecount: '00:00:00',
    })
  },
  timer: function () {
    var that = this;
    console.log(that.data.millisecond)
    that.setData({
      millisecond: that.data.millisecond + 5
    })
    if (that.data.millisecond >= 100) {
      that.setData({
        millisecond: 0,
        second: that.data.second + 1
      })
    }
    if (that.data.second >= 60) {
      that.setData({
        second: 0,
        minute: that.data.minute + 1
      })
    }
    if (that.data.minute >= 60) {
      that.setData({
        minute: 0,
        hour: that.data.hour + 1
      })
    }
    that.setData({
      timecount: that.data.hour + ":" + that.data.minute + ":" + that.data.second + ":" + that.data.millisecond
    })
  },
});

.container{
  height:200rpx;
  line-height:200rpx;
  font-size:50rpx;
}
button{
  width:150rpx;
  background: rgb(7, 193, 96);
  color: #fff;
  margin-bottom: 8px;
}