docs: function () {
      var date = new Date();
      var dateStr = this._parseDate();
      var hours = date.getHours();
      var minutes = date.getMinutes();
      var seconds = date.getSeconds();
  
      hours = (hours+'').length === 1 ? '0' + hours : hours;
      minutes = (minutes+'').length === 1 ? '0' + minutes : minutes;
      seconds = (seconds+'').length === 1 ? '0' + seconds : seconds;
  
      dateStr = dateStr + '_' + hours;
      dateStr = dateStr + '_' + minutes;
      dateStr = dateStr + '_' + seconds;
  
      return dateStr;
    }