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HTML

              
                <section class="class_modal-sample">
  <h2 style="display: none;">サンプルコード</h2>
  <!-- モーダルウィンドウここから -->
  <div class="thumb">
    <ul class="thumb__items">
      <li><img src="https://m-kenomemo.com/sample/lightbox-like/images/photo01.jpg" data-caption="サムネイル1"></li>
      <li><img src="https://m-kenomemo.com/sample/lightbox-like/images/photo02.jpg" data-caption="サムネイル2"></li>
      <li><img src="https://m-kenomemo.com/sample/lightbox-like/images/photo03.jpg" data-caption="サムネイル3"></li>
      <li><img src="https://m-kenomemo.com/sample/lightbox-like/images/photo04.jpg" data-caption="サムネイル4"></li>
    </ul>
  </div>
  <div class="modal">
    <div class="modal__item"><img src=""></div>
    <div class="modal__caption"></div>
    <div class="modal__close"><i class="fas fa-times-circle"></i></div>
    <div class="modal__prev"><i class="fas fa-angle-left"></i></div>
    <div class="modal__next"><i class="fas fa-angle-right"></i></div>
  </div>
  <div class="modal-overlay"></div>
</section><!-- /thumb_thumb-sample -->

              
            
!

CSS

              
                		.thumb {

		}
		.thumb__items {
			display: flex;
			flex-flow: wrap;
			position: relative;
			z-index: 10;
      padding-left: 0;
		}
		.thumb__items > li {
			flex: 0 1 25%;
			list-style: none;
			cursor: pointer;
			position: relative;
		}
		.thumb__items > li img {
			max-width: 100%;
			position: relative;
			vertical-align: bottom;
		}
		.thumb__items > li:before {
			content: "";
			display: block;
			opacity: 0;
			background: rgba(0, 0, 0, 0.6);
			width: 100%;
			height: 100%;
			position: absolute;
			left: 0;
			top: 0;
			z-index: 10;
			transition: all 0.5s 0.3s ease;
		}
		.thumb__items > li:hover::before {
			opacity: 1;
		}
		.modal {
			display: none;
			position: absolute;
			top: 50%;
			left: 50%;
			z-index: 999;
			transform: translate(-50%, -50%);
			width: 100%;
			margin: auto;
			opacity: 0;
			z-index: 1;
			transition: all 0.5s 0s ease;
		}
		.modal.visible {
			display: block;
			opacity: 1;
			z-index: 999;
		}
		@media screen and (min-width: 980px) {
			.modal {
				width: auto;
				max-width: 880px;
				margin: 10px;
				position: relative;

			}
		}
		.modal__item {
			background: #5c5c5c;

		}
		.modal__item img {
			max-width: 100%;
			vertical-align: bottom;
		}
		.modal__caption {
			position: absolute;
			color: #fff;
			line-height: 1.6;
			padding: 10px;
		}
		@media screen and (min-width: 980px) {
			.modal__caption {
				padding: 10px 0;
			}
		}
		.modal__close {
			position: absolute;
			top: -60px;
			right: 15px;
			z-index: 9999;
		}
		@media screen and (min-width: 980px) {
			.modal__close {
				top: -15px;
				right: -15px;
			}
		}
		.modal__prev {
			position: absolute;
			top: 50%;
			transform: translate(0, -50%);
			left: 20px;
			z-index: 9999;
		}
		@media screen and (min-width: 980px) {
			.modal__prev {
				left: -30px;
			}
		}
		.modal__next {
			position: absolute;
			top: 50%;
			transform: translate(0, -50%);
			right: 20px;
			z-index: 9999;
		}
		@media screen and (min-width: 980px) {
			.modal__next {
				right: -30px;
			}
		}
		.modal-overlay {
			display: none;
			position: fixed;
			top: 0;
			left: 0;
			right: 0;
			z-index: 1;
			background: rgba(0, 0, 0, 0.6);
			width: 100%;
			height: 100%;
			opacity: 0;
			transition: all 0.5s 0s ease;
		}
		.modal-overlay.visible {
			display: block;
			opacity: 1;
			z-index: 100;
		}
		.fas {
			font-size: 40px;
			cursor: pointer;
			color: rgba(255, 255, 255, 0.6);
		}
		.fadein {
    animation: fadein .3s;
}
 
	.fadeout {
			animation: fadeout .3s;
			animation-fill-mode: forwards;
	}
	@keyframes fadein {
			0% {
					opacity: 0;
			}
			100% {
					opacity: 1;
			}
	}
	@keyframes fadeout {
			0% {
					opacity: 1;
			}
			100% {
					opacity: 0;
					display: none;
			}
	}
              
            
!

JS

              
                class Modal {
  constructor() {
    //初期値(DOM)
    this.DOM = {};
    this.DOM.thumbItems = document.querySelectorAll('.thumb__items li');
    this.DOM.modal = document.querySelector('.modal');
    this.DOM.modalOverlay = document.querySelector('.modal-overlay');
    this.DOM.modalItem = document.querySelector('.modal__item');
    this.DOM.modalCaption = document.querySelector('.modal__caption');
    this.DOM.modalClose = document.querySelector('.modal__close');
    this.DOM.modalPrev = document.querySelector('.modal__prev');
    this.DOM.modalNext = document.querySelector('.modal__next');

    // スワイプ座標
    this.startX;
    this.endX;
    // ターゲット要素
    this.thumbTarget;
    // 何番めの要素か
    this.thumbCurrent;

    // 最初に実行する関数
    this._init();
  }

  _init() {
    this.DOM.thumbItems.forEach((thumbItem, index, array) => {
      thumbItem.addEventListener('click', this._appearModal.bind(this, thumbItem, index));
    });

    this._clickEvent();
    this._swipeEvent();
  }
  
  // クリックイベント
  _clickEvent() {
    this.DOM.modalClose.addEventListener('click', this._disappearModal.bind(this));
    this.DOM.modalOverlay.addEventListener('click', this._disappearModal.bind(this));
    this.DOM.modalNext.addEventListener('click', this._next.bind(this));
    this.DOM.modalPrev.addEventListener('click', this._prev.bind(this));
  }
  // スワイプイベント
  _swipeEvent() {
    this.DOM.modalItem.addEventListener('touchmove', this._swipeStart.bind(this));
    this.DOM.modalItem.addEventListener('touchstart', this._swipeMove.bind(this));
    this.DOM.modalItem.addEventListener('touchend', this._swipeEnd.bind(this));
  }
  _swipeMove(event) {
    event.preventDefault();
    this.endX = event.touches[0].pageX;
  }
  _swipeStart(event) {
    event.preventDefault();
    this.startX = event.touches[0].pageX;
  }
  _swipeEnd(event) {
    event.preventDefault();
    console.log('startX:' + this.startX);
    console.log('endX:' + this.endX);
    if( 0 < (this.endX - this.startX) ) {
      this._next();
    } else {
      this._prev();
    }
  }
  // モーダル表示
  _appearModal(thumbItem, index) {
    this.thumbCurrent = index; // 現在のindex
    this.DOM.modal.classList.add('visible');
    this.DOM.modalOverlay.classList.add('visible');

    this.thumbTarget = thumbItem; //モーダル表示する要素
    
    this._modalShow(this.thumbTarget); // モーダル表示
  }
  // モーダル非表示
  _disappearModal() {
    this.DOM.modal.classList.remove('visible');
    this.DOM.modalOverlay.classList.remove('visible');
  }
  // モーダルに表示する画像
  _modalShow(self) {
    const imgElm = self.childNodes[0];
    const targetmodalItem = this.DOM.modalItem.childNodes[0];
    targetmodalItem.classList.add('fadein');
    targetmodalItem.src = imgElm.src;
    // フェードインのクラス
    setTimeout(function() {
      targetmodalItem.classList.add('fadeout');
      targetmodalItem.classList.remove('fadein');
      targetmodalItem.classList.remove('fadeout');
    },300);

    this._modalCaption(imgElm);
  }
  // モーダルに表示するキャプション
  _modalCaption(imgElm) {
    this.DOM.modalCaption.innerText = imgElm.dataset.caption
  }
  _next() {
    this.thumbCurrent = this._changeCount(1, this.thumbCurrent, this.DOM.thumbItems.length);
    this.thumbTarget = this.DOM.thumbItems[this.thumbCurrent];
    this._modalShow(this.thumbTarget); // モーダル表示
  }
  _prev() {
    this.thumbCurrent = this._changeCount(-1, this.thumbCurrent, this.DOM.thumbItems.length);
    this.thumbTarget = this.DOM.thumbItems[this.thumbCurrent];

    this._modalShow(this.thumbTarget); // モーダル表示
  }

  // 変更する番号を取得
  _changeCount(num, index, len) {
    return (index + num + len) % len;
  }
}

// インスタンス化
const modal = new Modal();
              
            
!
999px

Console