old_contents: import data from '../../config.json';
  
  
  export class Songs {
    oUrls = data.original.urls;
    _oUrls = data.original._urls;
  
    pUrls = data.pub.urls;
    _pUrls = data.pub._urls;
  
    mUrls = data.mission.urls;
    _mUrls = data.mission._urls;
  }
  
new_contents: import data from '../../config.json';
  
  
  export class Songs {
    oUrls = data.original.urls;
    _oUrls = data.original._urls;
  
    pUrls = data.pub.urls;
    _pUrls = data.pub._urls;
  
    mUrls = data.mission.urls;
    _mUrls = data.mission._urls;
  
    constructor() {
      this.originalElement = null;
      this.missionElement = null;
      this.pubElement = null;
    }
  
    originalClick() {
      this.originalElement.classList.remove('d-none');
      this.missionElement.classList.add('d-none');
      this.pubElement.classList.add('d-none');
    }
  
    missionClick() {
      this.originalElement.classList.add('d-none');
      this.missionElement.classList.remove('d-none');
      this.pubElement.classList.add('d-none');
    }
  
    pubClick() {
      this.originalElement.classList.add('d-none');
      this.missionElement.classList.add('d-none');
      this.pubElement.classList.remove('d-none');
    }
  
    attached() {
      this.originalElement = document.getElementById('original');
      this.missionElement = document.getElementById('mission');
      this.pubElement = document.getElementById('pub');
    }
  }
  
subject: add controlllers/handlers for click.