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>
<!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>
<!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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