JS implementation of obtaining time and setting countdown code sharing

This article mainly shares with you the JS implementation of obtaining time and setting countdown code, hoping to help everyone.

Just take notes and record them, mainly using Date and setInterval
The setting of the first countdown:

<script type="text/javascript">
    var timeBox = document.querySelector("#time");    function countdown(){
      var nowTime = new Date();      var targetTime = new Date("2018/2/27 15:44:15");      var spanTime = targetTime-nowTime;      if(spanTime <=0){
        timeBox.innerHTML="立即抢购";
        clearInterval(countdown);
      }else{        var hours = Math.floor(spanTime/(1000*60*60));
      spanTime-=hours*60*60*1000;      var minute = Math.floor(spanTime/(1000*60));
      spanTime-=minute*60*1000;      var second = Math.floor(spanTime/1000);
      hours<10 ? hours=&#39;0&#39;+hours : hours;
      minute<10 ? minute=&#39;0&#39;+minute : minute;
      second<10 ? second=&#39;0&#39;+second : second;
      timeBox.innerHTML=hours+&#39;:&#39;+minute+&#39;:&#39;+second;
      }

    }    var timer = window.setInterval(countdown,1000);  </script>

The second one , display the current date:

<script type="text/javascript">
    var timeBox = document.querySelector("#time");    function countdown(){
      var date = new Date();      var hours = date.getHours();      var minute = date.getMinutes();      var second = date.getSeconds();
      hours =checkTime(hours);
      minute =checkTime(minute);
      second =checkTime(second);
      timeBox.innerHTML = hours+&#39;:&#39;+minute+&#39;:&#39;+second;
    }    // 检测时间数字是否小于10，在小于10的数字前加一个‘0’
    function checkTime(i){
      i<10 ? i="0"+i :i;      return i;
    }    var timer = window.setInterval(countdown,1000);  </script>

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