這個“點擊放大影像”功能如何處理多張影像？

我無法在多個影像上獲得這種效果。JavaScript 要求getElementById它似乎只適用于單個影像，我嘗試將其更改為getElementByClassName（以及 HTML 和 CSS），但隨后該函式停止作業，我怎樣才能在多個影像/div 上獲得這種效果？

window.onload = function() {

  var modal = document.getElementById('myModal');

  var img = document.getElementById('myImg');
  var modalImg = document.getElementById("img01");
  var captionText = document.getElementById("caption");


  img.onclick = function() {
    modal.style.display = "block";
    modalImg.src = this.src;
    captionText.innerHTML = this.alt;

  };

  var span = document.getElementsByClassName("modal")[0];

  span.onclick = function() {
    modal.style.display = "none";
  };


};

.modal {
  display: none;
  position: fixed;
  z-index: 1;
  padding-top: 100px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgb(0, 0, 0);
  background-color: rgba(0, 0, 0, 0.9);
}

.modal-content {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
}

#caption {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  text-align: center;
  color: #ccc;
  padding: 10px 0;
  height: 150px;
}

#myImg:hover {
  cursor: pointer;
}

@-webkit-keyframes zoom {
  from {
    -webkit-transform: scale(0)
  }
  to {
    -webkit-transform: scale(1)
  }
}

@keyframes zoom {
  from {
    transform: scale(0.1)
  }
  to {
    transform: scale(1)
  }
}

.close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: white;
  font-size: 60px;
  font-weight: bold;
  ;
}

.close:hover {
  color: #FFD270;
  text-decoration: none;
  cursor: pointer;
}

#myImg {
  opacity: 1;
  display: inline-block;
  width: 100%;
  height: auto;
  transition: .45s ease;
  backface-visibility: hidden;
  margin: 20px;
}

<div class="myndir-a4" data-title="">
  <img id="myImg" src="..\01.jpg" alt="this works fine">
  <div id="myModal" class="modal">
    <span class="close">X</span>
    <img id="img01" class="modal-content" src="..\01.jpg" alt="">
    <div id="caption"></div>
  </div>
</div>



<div class="myndir-a4" data-title="">
  <img id="myImg" src="..\02.jpg" alt="nothing happens">
  <div id="myModal" class="modal">
    <span class="close">X</span>
    <img id="img01" class="modal-content" src="..\02.jpg" alt="">
    <div id="caption"></div>
  </div>
</div>

uj5u.com熱心網友回復：

答案是委托

筆記

• 更改 display: none 以隱藏標簽和
• 將大多數 ID 更改為 class 或洗掉它們，因為由于相對尋址不再需要它們

甚至可能只有一種模式

window.addEventListener("DOMContentLoaded", () => {
  document.getElementById("container").addEventListener("click", e => {
    const tgt = e.target;
    if (!tgt.matches(".myImg") && !tgt.matches(".close")) return; // not the image or close
    const parent = tgt.closest("div.myndir-a4");
    const modal = parent.querySelector('.modal');
    if (tgt.matches(".close")) {
      modal.hidden = true;
      return;
    }
    const modalImg = parent.querySelector("img.modal-content");
    const captionText = parent.querySelector(".caption");
    modal.hidden = false;
    modalImg.src = tgt.src;
    captionText.innerHTML = tgt.alt;
  });
});

.modal {
  position: fixed;
  z-index: 1;
  padding-top: 100px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgb(0, 0, 0);
  background-color: rgba(0, 0, 0, 0.9);
}

.modal-content {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
}

.caption {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  text-align: center;
  color: #ccc;
  padding: 10px 0;
  height: 150px;
}

.myImg:hover {
  cursor: pointer;
}

@-webkit-keyframes zoom {
  from {
    -webkit-transform: scale(0)
  }
  to {
    -webkit-transform: scale(1)
  }
}

@keyframes zoom {
  from {
    transform: scale(0.1)
  }
  to {
    transform: scale(1)
  }
}

.close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: white;
  font-size: 60px;
  font-weight: bold;
  ;
}

.close:hover {
  color: #FFD270;
  text-decoration: none;
  cursor: pointer;
}

.myImg {
  opacity: 1;
  display: inline-block;
  width: 100%;
  height: auto;
  transition: .45s ease;
  backface-visibility: hidden;
  margin: 20px;
}

<div id="container">
  <div class="myndir-a4" data-title="">
    <img class="myImg" src="https://via.placeholder.com/728x90.png?text=image1" alt="this works fine">
    <div class="modal" hidden>
      <span class="close">X</span>
      <img class="modal-content" src="" alt="">
      <div class="caption"></div>
    </div>
  </div>

  <div class="myndir-a4" data-title="">
    <img class="myImg" src="https://via.placeholder.com/728x90.png?text=image2" alt="This ALSO works now">
    <div class="modal" hidden>
      <span class="close">X</span>
      <img class="modal-content" src="" alt="">
      <div class="caption"></div>
    </div>
  </div>
</div>

我明白了

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