code: function decodePeriodTime(map, timeStr, type){
    let times = timeStr.split('/');
    let min = Limit[type][0];
    let max = Limit[type][1];
  
    let remind = Number(times[0]);
    let period = Number(times[1]);
  
    if(period==0)
      return;
  
    for(let i = min; i <= max; i++){
      if(i%period == remind)
        map[i] = i;
    }
  }
docs: Compute the period timer