微信小程序 倒计时

1. <!-倒计时  wxml-->  

2. <view>{{countDownDay}}天{{countDownHour}}小时{{countDownMinute}}分钟{{countDownSecond}}秒</view>

3. <!-倒计时  js--> 

   Page( {  
     data: {   
       countDownDay: 0,  
       countDownHour: 0,  
       countDownMinute: 0,  
       countDownSecond: 0,  
     }, 
     onLoad: function() {  
       var num = 4085033658;
       this.countDown(num ); 
     },  
     
     // 页面渲染完成后 调用  
     countDown: function (num) {  
       var totalSecond = num - 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);  
     },  
    
   })