模式弹出窗口在网格图片的每个按钮上显示第一条记录

<div class="grid">
  <div class="item" id="item1">
    <img src="image1.jpg" alt="Image 1">
    <button class="popup-btn">查看详情</button>
  </div>
  <!-- 其他网格项 -->
</div>

<!-- 模式弹出窗口 -->
<div id="modal" class="modal">
  <div class="modal-content">
    <span class="close-btn">&times;</span>
    <p id="modal-text">这里是第一条记录的内容。</p>
  </div>
</div>

.modal {
  display: none; /* 默认隐藏 */
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.4);
}

.modal-content {
  background-color: #fefefe;
  margin: 15% auto;
  padding: 20px;
  border: 1px solid #888;
  width: 80%;
}

.close-btn {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

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

document.addEventListener('DOMContentLoaded', function() {
  var modal = document.getElementById('modal');
  var btn = document.querySelectorAll('.popup-btn');
  var span = document.getElementsByClassName('close-btn')[0];

  btn.forEach(function(button) {
    button.onclick = function() {
      modal.style.display = 'block';
      document.getElementById('modal-text').innerText = '这里是第一条记录的内容。';
    }
  });

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

  window.onclick = function(event) {
    if (event.target == modal) {
      modal.style.display = 'none';
    }
  }
});