活动倒计时脚本

活动倒计时脚本，根据当前活动状态来修改活动提示及活动的时间

(function() {
  var $actime, $actitle, $endtime, $nowtime, $starttime, acinfo, init, timer;
  $actime = document.getElementById('ac-time');
  $actitle = document.getElementById('ac-title');
  $endtime = new Date("2013/09/27 00:00:00");//系统结束时间
  $nowtime = new Date("2013/09/25 15:05:40").getTime();//系统当前时间
  $starttime = new Date("2013/09/23 17:43:11"); //系统结束时间
  acinfo = {};
  /*活动状态信息  0表示未开始，1表示已开始，2表示已结束*/
  acinfo.status = 0;
  /*切换提示标题函数*/
  acinfo.changeTitle = function(status) {
    var $title;
    $title = ['距开始时间', '剩余时间', '活动已结束'];
    return $actitle.innerHTML = $title[status];
  };
  acinfo.changetime = function(time, status) {
    return $actime.innerHTML = status !== 2 ? '<i class="cf90">' + time.d + '</i>天<i class="cf90">' + time.h + '</i>时<i class="cf90">' + time.m + '</i>分' : '活动已结束';
  };
  acinfo.changeStatus = function() {
    if ($starttime.getTime() > $nowtime) {
      return this.status = 0;
    } else if ($nowtime > $endtime.getTime()) {
      return this.status = 2;
    } else {
      return this.status = 1;
    }
  };

  acinfo.update = function(status, refreshTime/*setInterval时间*/) {
    var cTime, dhm, i, time;
    time = {};
    i = 1;
    $nowtime = $nowtime + (i++) * refreshTime;
    cTime = status === 0 ? $starttime : $endtime;
    dhm = parseInt((cTime.getTime() - $nowtime) / 1000);
    time.d = parseInt(dhm / 3600 / 24);
    time.h = parseInt((dhm / 3600) % 24);
    time.m = parseInt((dhm / 60) % 60);
    acinfo.changeTitle(status);
    return acinfo.changetime(time, status);
  };
  init = function() {
    acinfo.changeStatus();
    if (acinfo.status === 2) {
      clearInterval(timer);
    }
    return acinfo.update(acinfo.status, 60000);
  };
  init();
  timer = setInterval(init, 60000);
}).call(this);

如果有任何扩展，只需要去增加当前活动的状态就可