jQuery倒计时代码(超简单)

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <title>Title</title>

</head>

<body>

  <span class="timespan"></span>

<script src="libs/jquery-1.11.3.js"></script>

<script>

  var starttime = new Date("2017/11/20");

  setInterval(function () {

    var nowtime = new Date();

    var time = starttime - nowtime;

    var day = parseInt(time / 1000 / 60 / 60 / 24);

    var hour = parseInt(time / 1000 / 60 / 60 % 24);

    var minute = parseInt(time / 1000 / 60 % 60);

    var seconds = parseInt(time / 1000 % 60);

    $('.timespan').html(day + "天" + hour + "小时" + minute + "分钟" + seconds + "秒");

  }, 1000);

</script>

</body>

</html>