如何在HTML中实现多张可点击模态图片？新手技术求助

你的问题核心是重复使用了同一个ID——HTML里ID必须唯一，getElementById只会选中第一个带该ID的元素，所以只有第一张图能触发模态框。下面是修改后的完整实现：

关键修改点 #

1. 把图片的id="myImg"改成class="myImg"，这样可以批量选中所有图片
2. CSS选择器从#myImg改成.myImg，匹配所有带这个类的图片
3. JS里用querySelectorAll获取所有图片，循环给每个绑定点击事件
4. 共用同一个模态框容器，点击不同图片时替换模态框内的图片和标题

修改后的完整代码 #

HTML #

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>

<ul>
<li><img class="myImg" src="images/Husmand.jpg" alt="Husmand, 1900" style="width:100%;max-width:300px"> </li>
<li> <img class="myImg" src="images/Black Death, 1900.jpg" alt="Black Death, 1900" style="width:100%;max-width:300px"> </li>
</ul>

<div id="myModal" class="modal">
  <span class="close">&times;</span>
  <img class="modal-content" id="img01">
  <div id="caption"></div>
</div>

</body>
</html>

CSS #

body {font-family: century;}

.myImg {
  border-radius: 10px;
  cursor: pointer;
  transition: 0.3s;
}

.myImg:hover {opacity: 0.9;}

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

.modal-content {
  margin: auto;
  display: block;
  width: 50%;
  max-width: 400px;
  align-content: center;
}

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

.modal-content, #caption {  
  animation-name: zoom;
  animation-duration: 0.6s;
}

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

.close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: #f1f1f1;
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
}

.close:hover,
.close:focus {
  color: #bbb;
  text-decoration: none;
  cursor: pointer;
}

@media only screen and (max-width: 700px){
  .modal-content {
    width: 100%;
  }
}

JavaScript #

var modal = document.getElementById("myModal");
var modalImg = document.getElementById("img01");
var captionText = document.getElementById("caption");

// 获取所有带myImg类的图片
var imgs = document.querySelectorAll(".myImg");

// 循环给每个图片绑定点击事件
imgs.forEach(function(img) {
  img.onclick = function(){
    modal.style.display = "block";
    modalImg.src = this.src;
    captionText.innerHTML = this.alt;
  }
});

// 关闭按钮事件
var span = document.getElementsByClassName("close")[0];
span.onclick = function() { 
  modal.style.display = "none";
}

// 点击模态框背景也关闭（可选优化）
modal.onclick = function(event) {
  if (event.target == modal) {
    modal.style.display = "none";
  }
}

内容的提问来源于stack exchange，提问作者tuba