js 倒计时

<script LANGUAGE="javascript">   //获取服务器时间当前剩余秒数var seconds;$.ajax({ type: "GET", url: "time.php", data:   "", success: function(msg){seconds = msg;showtime( seconds );window.setInterval(timedown,1000);  } });//自减秒数function timedown(){seconds--;showtime(seconds);}//倒计时function showtime( leftSecond ) {leftSecond = parseInt(leftSecond);if(leftSecond > 0){var day = Math.floor(leftSecond/(24*3600));leftSecond = parseInt((leftSecond%(24*3600)));var hour = Math.floor(leftSecond/3600);leftSecond = parseInt(leftSecond%3600);var minute = Math.floor(leftSecond/60);var second = leftSecond%60;var countdown = '秒杀 '+day+'天 '+hour+'小时 '+minute+'分钟 '+second+'秒';$('.miao p').eq(0).html(countdown);}else if(leftSecond <= 0){$('.miao p').eq(0).html('进行中...');}}</script>