js当前系统时间

<script>
  let tianWenTime;
  let tianWenTimeText;

 function  getTianWenTime(){
        if (tianWenTime){
          clearInterval(tianWenTime)
        }
       
        tianWenTime = setInterval(function(){
          var time=new Date();
          var year=time.getFullYear(); //获取年份
          var month=time.getMonth()+1; //获取月份
          var day=time.getDate();  //获取日期
          var hour=checkTime(time.getHours());  //获取时
          var minite=checkTime(time.getMinutes()); //获取分
          var second=checkTime(time.getSeconds()); //获取秒
     
          tianWenTimeText=year+"年"+month+"月"+day+"日 "+hour+":"+minite+":"+second;
        },1000)
      }

     /****当时、分、秒、小于10时，则添加0****/
          function checkTime(i){
            if(i<10) return "0"+i;
            return i;
          }
</script>