Use js to do activity when the time expires, let the countdown stop beating

//闪购活动
var clocks = document.getElementById("clock");
// alert(clocks);

function leftTimer(){

  var now = new Date();
  //创建一个新日期
  var endDate=new Date('2020/6/20 22:58');
  //创建一个指定日期
  var leftTime = (endDate.getTime()-now.getTime())/1000;
  // alert(leftTime);
  //使两个日期都转换为毫秒 再让指定日期减去当前日期
  //计算出来的毫秒数除以1000 计算剩余秒数

  // var days = parseInt(leftTime/60/60/24);

  var hours = parseInt(leftTime/60/60);

  var minutes = parseInt(leftTime/60%60);

  var seconds = parseInt(leftTime%60);
  // alert(seconds);

  //补零
  if(hours < 10){
    hours = '0' + hours;
  }
  if(minutes < 10){
    minutes = '0' + minutes;
  }
  if(seconds < 10){
    seconds = '0' + seconds;
  }

  //拼接
  time =  hours + "小时" + minutes + "分钟" + seconds + "秒";
  
  if(leftTime <= 0 ){
    clocks.innerHTML = "活动已经结束";
  }else{
      clocks.innerHTML = time;
  }
 
}

leftTimer();
//由于第一秒时候为空，所以先执行再下一步
setInterval(leftTimer,1000);
//每隔一秒执行一次

}

Effect picture