然后，我们使用 JavaScript 来显示模态窗口，当我们点击图片时，图片会在弹出的窗口中显示 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <style>
    #myImg {
      border-radius: 5px;
      cursor: pointer;
      transition: 0.3s;
    }

    #myImg:hover {
      opacity: 0.7;
    }
    /* The Modal (background) */

    .modal {
      display: none;
      /* Hidden by default */
      position: fixed;
      /* Stay in place */
      z-index: 1;
      /* Sit on top */
      padding-top: 100px;
      /* Location of the box */
      left: 0;
      top: 0;
      width: 100%;
      /* Full width */
      height: 100%;
      /* Full height */
      overflow: auto;
      /* Enable scroll if needed */
      background-color: rgb(0, 0, 0);
      /* Fallback color */
      background-color: rgba(0, 0, 0, 0.9);
      /* Black w/ opacity */
    }
    /* Modal Content (image) */

    .modal-content {
      margin: auto;
      display: block;
      width: 80%;
      max-width: 700px;
    }
    /* Caption of Modal Image */

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

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

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

    @keyframes zoom {
      from {
        transform: scale(0.1)
      }
      to {
        transform: scale(1)
      }
    }
    /* The Close Button */

    .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;
    }
    /* 100% Image Width on Smaller Screens */

    @media only screen and (max-width: 700px) {
      .modal-content {
        width: 100%;
      }
    }
  </style>
</head>
<body>

  <h2>图片模态框</h2>
  <p>本实例演示了如何结合 CSS 和 JavaScript 来一起渲染图片。</p>
  <p>
    首先，我们使用 CSS 来创建 modal 窗口 (对话框), 默认是隐藏的。
    <p>
      <p>然后，我们使用 JavaScript 来显示模态窗口，当我们点击图片时，图片会在弹出的窗口中显示：</p>
      <img id="myImg" src="https://www.mifengjc.com/wp-content/uploads/2016/04/img_lights.jpg" alt="Northern Lights, Norway" width="300" height="200">

      <!-- The Modal -->
      <div id="myModal" class="modal">
        <span class="close">×</span>
        <img class="modal-content" id="img01">
        <div id="caption"></div>
      </div>

      <script>
        // 获取模态窗口
        var modal = document.getElementById('myModal');
        // 获取图片模态框，alt 属性作为图片弹出中文本描述
        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;
          modalImg.alt = this.alt;
          captionText.innerHTML = this.alt;
        }
        // 获取 <span> 元素，设置关闭模态框按钮
        var span = document.getElementsByClassName("close")[0];
        // 点击 <span> 元素上的 (x), 关闭模态框
        span.onclick = function() {
          modal.style.display = "none";
        }
      </script>

</body>
</html>
        