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[Java教程]JS中的倒计时

一、注:一般倒计时的时间都是后台传来的然后渲染到页面,这里有2个简单的倒计时方式

//带天数的倒计时
function countDown(times){ var timer=null; timer=setInterval(function(){ var day=0, hour=0, minute=0, second=0;//时间默认值 if(times > 0){ day = Math.floor(times / (60 * 60 * 24)); hour = Math.floor(times / (60 * 60)) - (day * 24); minute = Math.floor(times / 60) - (day * 24 * 60) - (hour * 60); second = Math.floor(times) - (day * 24 * 60 * 60) - (hour * 60 * 60) - (minute * 60); } if (day <= 9) day = '0' + day; if (hour <= 9) hour = '0' + hour; if (minute <= 9) minute = '0' + minute; if (second <= 9) second = '0' + second; // console.log(day+"天:"+hour+"小时:"+minute+"分钟:"+second+"秒"); times--; },1000); if(times<=0){ clearInterval(timer); }}
//单纯分钟和秒倒计时function resetTime(time){ var timer=null; var t=time; var m=0; var s=0; m=Math.floor(t/60%60); m<10&&(m='0'+m);    s=Math.floor(t%60); function countDown(){  s--;  s<10&&(s='0'+s);  if(s.length>=3){  s=59;  m="0"+(Number(m)-1);  }  if(m.length>=3){  m='00';  s='00';  clearInterval(timer);  }  console.log(m+"分钟"+s+"秒"); } timer=setInterval(countDown,1000);}

 

二、如何使用