How to use timer to implement countdown function in js-JS Tutorial-php.cn

How to use timer to implement countdown function in js

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Release： 2018-04-16 10:03:57

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This time I will show you how to use jstimerto realize thecountdown function, js uses timer to realize the countdown functionNotesThere are Which ones, the following are practical cases, let’s take a look.

Date function

Countdown = use future time - present time

Question: The future time is 1970 milliseconds away - the present time is 1970 years 1

Just use the number of milliseconds in the future - the number of milliseconds now and continue to convert.

<!DOCTYPE html>
<html>
<head lang="en">
 <meta charset="UTF-8">
 <title></title>
 <style>
  body{
   font-size:30px;
   text-align: center;
   color:red;
  }
 </style>
 <script>
  window.onload = function(){
   var demo = document.getElementById("demo");
   var endTime = new Date("2017/11/12 17:30:00"); // 最终时间
   setInterval(clock,1000); // 开启定时器
   function clock(){
    var nowTime = new Date(); // 一定是要获取最新的时间
    // console.log(nowTime.getTime()); 获得自己的毫秒
    var second = parseInt((endTime.getTime() - nowTime.getTime()) / 1000);
    // 用将来的时间毫秒 - 现在的毫秒 / 1000 得到的 还剩下的秒 可能处不断 取整
    // console.log(second);
     // 一小时 3600 秒
    // second / 3600 一共的小时数 /24 天数
    var d = parseInt(second / 3600 / 24); //天数
    //console.log(d);
    var h = parseInt(second / 3600 % 24) // 小时
    // console.log(h);
    var m = parseInt(second / 60 );
    //console.log(m);
    var s = parseInt(second ); // 当前的秒
    console.log(s);
    /* if(d<10)
    {
     d = "0" + d;
    }*/
    d<10 ? d="0"+d : d;
    h<10 ? h="0"+h : h;
    m<10 ? m="0"+m : m;
    s<10 ? s="0"+s : s;
    demo.innerHTML = "距离抢购时间还剩: "+d+"天 "+h+"小时 "+m+"分钟 "+s+"秒";
   }
  }
 </script>
</head>
<body>
<p id="demo"></p>
</body>
</html>

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