当双击鼠标时运行脚本 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <script>
    function copyText() {
      document.getElementById("field2").value = document.getElementById("field1").value;
    }
  </script>
</head>
<body>

  字段1: <input type="text" id="field1" value="Hello World!"><br> 字段2: <input type="text" id="field2">
  <br><br>
  <button ondblclick="copyText()">复制文本</button>

  <p>在按钮双击时触发函数。函数将字段1的文字信息复制到字段2。</p>

</body>
</html>
        