一起学习下倒计时的功能

作者：andy0012018.05.30来源：Web前端之家浏览：10507评论:0

一起学习下倒计时的功能.

<!DOCTYPE>
<html>

<head>
  <meta charset="utf-8" />
  <title>倒计时</title>
  <script src="/demo/js/jq.js"></script>
</head>

<body>
  <div id="time_return"></div>
  <script type="text/javascript">
    var time_end = new Date("2018/6/30 16:43:0").getTime(),
        timeclear;
        setTimeout("distance_time()");

    function distance_time(){
      var time_div = document.getElementById("time_return"),
          time_start = new Date().getTime(),
          time_distance = time_end -time_start;
      if(!time_div){ return;}
      if(time_distance>0){
        var int_day,int_hour, int_minute, int_second;
        int_day =  Math.floor(time_distance/(24*60*60*1000));
        time_distance -=int_day*(24*60*60*1000);
        int_hour =  Math.floor(time_distance/(60*60*1000));
        time_distance -=int_hour*(60*60*1000);
        int_minute =  Math.floor(time_distance/(60*1000));
        time_distance -=int_minute*(60*1000);
        int_second =  Math.floor(time_distance/1000);
        $("#time_return").html(int_day +"天"+ int_hour +"时"+ int_minute +"分"+ int_second +"秒" )
        setTimeout("distance_time()",1000);
      }else{
        alert("时间到！");
        clearTimeout("timeclear");
      }
    }
    </script>
</body>

</html>

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