<script type="text/javascript">  var maxtime = 1350057600 //截止到的日期  var now=parseInt((new Date().getTime())/1000);//获取当前的日期  var cha_time=maxtime-now;//中间所差的时间    下面方法把相差的时间组合成倒计时的字符串，然后放到页面相应位置实现，实时刷新  function CountDown(){    if(cha_time>=0){  var day = Math.floor(cha_time/3600/24);  var hour= Math.floor((cha_time/3600)%24);  var minutes = Math.floor((cha_time/60)%60);    var seconds = Math.floor(cha_time%60);    msg = "离结束还有"+day+"天"+hour+"小时"+minutes+"分"+seconds+"秒";   $(".ws_sg_con_big,.ws_sg_con_small").find("dd").html(msg);  --cha_time;    }    else{    clearInterval(timer);    alert("时间到，结束!");    }    }    timer = setInterval("CountDown()",1000);   </script>