倒计时

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<!DOCTYPE html>
<html>
  <head>
    <title>倒计时</title>
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <p id="timeout"> </p>

</html>


<script>
//定义计时器,每隔1秒钟调用timer函数
var timerCount= window.setTimeout("timer()",1000);
function timer(){
     var date=new Date("2018","1","1","0","0","0");
    var deadlineTime=date.getTime();
     var nowDate=new Date();
     var nowTime=nowDate.getTime();
     var distTime=deadlineTime-nowTime;
   //判断是否到达时间期限
    if(distTime>0){
     var d=Math.floor(distTime/1000/3600/24);
     var h=Math.floor(distTime/1000/3600%24);
     var m=Math.floor(distTime/1000/60%60);
     var s=Math.floor(distTime/1000%60);

     var str="距离结束时间还有"+d+"天"+h+"时"+m+"分"+s+"秒";
     document.getElementById("timeout").innerHTML=str;

     timerCount= window.setTimeout("timer()",1000);


     }else{
      //到达时间期限的时候清楚计时器;
      window.clearTimeout(timerCount);
      alert("时间已到");
    }
}
</script>
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