詳解小程序毫秒級倒計時（適用于拼團秒殺功能）

Page({
 
 /**
  * 頁面的初始數(shù)據(jù)
  */
 data: {
  countdown:''
,  endDate2: '2018-08-08 11:41:00'
 },
 /**
  * 生命周期函數(shù)--監(jiān)聽頁面加載
  */
 onLoad: function (options) {
  var that = this;
  that.countTime()
 },
 countTime() {
  var that = this;
  var date = new Date();
  var now = date.getTime();
  var endDate = new Date(that.data.endDate2);//設置截止時間
  var end = endDate.getTime();
  var leftTime = end - now; //時間差               
  var d, h, m, s, ms;
  if (leftTime >= 0) {
   d = Math.floor(leftTime / 1000 / 60 / 60 / 24);
   h = Math.floor(leftTime / 1000 / 60 / 60 % 24);
   m = Math.floor(leftTime / 1000 / 60 % 60);
   s = Math.floor(leftTime / 1000 % 60);
   ms = Math.floor(leftTime % 1000);
   ms = ms < 100 ? "0" + ms : ms
   s = s < 10 ? "0" + s : s
   m = m < 10 ? "0" + m : m
   h = h < 10 ? "0" + h : h
   that.setData({
    countdown: d + "：" + h + "：" + m + "：" + s + ":" + ms,
   })
   //遞歸每秒調用countTime方法，顯示動態(tài)時間效果
  setTimeout(that.countTime, 100);
  } else {
   console.log('已截止')
   that.setData({
    countdown:'00:00:00'
   })
  }
  
 },
})

<view>
  <text>{{countdown}}</text>
</view>