js实现一个页面多个倒计时的3种方法

本文实例为大家分享了js实现一个页面多个倒计时的具体代码，供大家参考，具体内容如下

说明： 方法1， 方法二是基础原理版，方法三升级版（参考for循环，定时器，闭包混合一块的那点事。）

方法一：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>倒计时</title>
</head>
<body> 

  <div id="timer1" style="color:red"></div>
  <div id="timer2" style="color:red"></div> 

</body>
<script>
  function countDown( maxtime,fn ) {
    var timer = setInterval(function() {
        if( !!maxtime ){
          var day = Math.floor(maxtime / 86400),
          hour = Math.floor((maxtime % 86400) / 3600),
        minutes = Math.floor((maxtime % 3600) / 60),
        seconds = Math.floor(maxtime%60),
        msg = "距离结束还有"+day+"天"+hour+"时"+minutes+"分"+seconds+"秒";
        fn( msg );
        --maxtime;
      } else {
        clearInterval( timer );
        fn("时间到，结束!");
      }
    }, 1000);
  }
  countDown( 86,function( msg ) {
    document.getElementById('timer1').innerHTML = msg;
  })
  countDown( 86400,function( msg ) {
    document.getElementById('timer2').innerHTML = msg;
  })
</script>
</html>

方法二：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>倒计时</title>
</head>
<body>
  <div id="timer1"></div>
  <div id="timer2"></div>
  <div id="timer3"></div>
</body>
<script type="text/javascript"> 

  var addTimer = function () {
    var list = [],
      interval; 

    return function (id, time) {
      if (!interval)
        interval = setInterval(go, 1000);
      list.push({ ele: document.getElementById(id), time: time });
    } 

    function go() {
      for (var i = 0; i < list.length; i++) {
        list[i].ele.innerHTML = getTimerString(list[i].time ? list[i].time -= 1 : 0);
        if (!list[i].time)
          list.splice(i--, 1);
      }
    } 

    function getTimerString(time) {
      var not0 = !!time,
        d = Math.floor(time / 86400),
        h = Math.floor((time %= 86400) / 3600),
        m = Math.floor((time %= 3600) / 60),
        s = time % 60;
      if (not0)
        return "还有" + d + "天" + h + "小时" + m + "分" + s + "秒";
      else return "时间到";
    }
  } (); 

  addTimer("timer1", 12);
  addTimer("timer2", 10);
  addTimer("timer3", 13);
</script>
</html>

方法三：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>倒计时</title>
</head>
<body> 

  <div id="timer0" style="color:red"></div>
  <div id="timer1" style="color:red"></div>
  <div id="timer2" style="color:red"></div>
</body>
<script>
  function countDown( maxtime,fn ) {
    var timer = setInterval(function() {
        if( !!maxtime ){
          var day = Math.floor(maxtime / 86400),
          hour = Math.floor((maxtime % 86400) / 3600),
        minutes = Math.floor((maxtime % 3600) / 60),
        seconds = Math.floor(maxtime%60),
        msg = "距离结束还有"+day+"天"+hour+"时"+minutes+"分"+seconds+"秒";
        fn( msg );
        --maxtime;
      } else {
        clearInterval( timer );
        fn("时间到，结束!");
      }
    }, 1000);
  }
  var aTime = [3600,3800,3900];
  for ( var i = 0; i < 3; i++ ) {
    (function (i) {
      var obj = 'timer' + i;
      countDown( aTime[i],function( msg ) {
        document.getElementById(obj).innerHTML = msg;
      })
    })(i)
  }

</script>
</html>

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