js 倒计时

function countdown() {
          var countTime = getCountdownTime('{{$pageData["countdown_time"]}}');
          if(!countTime){
              clearTimeout(timer1);
              $(".no-live").hide();
              $("#video_player_plugin").show();
              Page.initPlayer();
          } else {
              $(".no-live-content").text('{{$pageData["countdown_text"]}}'  + " " + countTime)
          }
          timer1 = setTimeout(countdown, 1000);
      }
      countdown();

function getCountdownTime(datetime) {

      var date1 = new Date();  //开始时间
      var date2 = new Date(Date.parse(datetime.replace(/-/g, "/")));    //结束时间
      var date3 = date2.getTime() - date1.getTime(); //时间差的毫秒数
      var leave1 = date3 % (24 * 3600 * 1000);   //计算天数后剩余的毫秒数
      var hours = Math.floor(leave1 / (3600 * 1000));
      var days = Math.floor(date3 / (24 * 3600 * 1000));

      //计算相差分钟数
      var leave2 = leave1 % (3600 * 1000);     //计算小时数后剩余的毫秒数
      var minutes = Math.floor(leave2 / (60 * 1000));
      //计算相差秒数
      var leave3 = leave2 % (60 * 1000);   //计算分钟数后剩余的毫秒数
      var seconds = Math.round(leave3 / 1000);
      if (days > 0) {
          return days + " 天 " + hours + " 小时 " + minutes + " 分钟 " + seconds + " 秒";
      } else if(hours>0){
          return hours + " 小时 " + minutes + " 分钟 " + seconds + " 秒";
      }else {
          return false
      }

  }