code: function setPeriodicalSchedule (start, end, time, timeUnit, frequency, point) {
    var periodical = {
      'start': start,
      'end': end,
      'time': time,
      'time_unit': timeUnit,
      'frequency': frequency,
      'point': point
    }
    this.trigger = JUtil.extend(this.trigger, {
      'periodical': periodical
    })
    return this
  }
docs: 具体参数格式参照：http://docs.jiguang.cn/server/rest_api_push_schedule/#_4