自己封装的一个简单的倒计时功能实例

function countDown(date,target,filter){  var setTime = new Date(date).getTime(),    timer = null;  function core(){    var nowTime = new Date().getTime(),      leftTime = 0,      d = 0,h = 0,m = 0,s = 0;    ////////////////////////////    //conditation @ doublue time    if(filter.length){      setTime = new Date();      for(var i=0,l=filter.length;i<l;i++){        setTime.setHours(filter[i]);        setTime.setMinutes(0);        setTime.setSeconds(0);        if(nowTime < setTime.getTime()){          break;        }else if(i == filter.length-1){          setTime.setDate(setTime.getDate()+1);          setTime.setHours(filter[0]);        }              }    }    ////////////////////////////    leftTime = Math.ceil((setTime - nowTime)/1000);    if(nowTime <= setTime){      d = ~~(leftTime/86400);      h = ~~(leftTime%86400/3600);      m = ~~(leftTime%86400%3600/60);      s = ~~(leftTime%86400%3600%60);      timer = setTimeout(core,1e3);    }else{      clearTimeout(timer);      timer = null;    }    //here set out format    target.innerHTML = 'd:'+d+' h:'+h+' m:'+m+' s:'+s;      }  core();}

// 普通调用countDown('2016/10/02/23:43',oDiv);// 指定时间循环倒计时countDown('2016/10/02/23:43',oDiv,[9,11,18]);