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<!DOCTYPE html> <html> <body> Field1: <input type="text" id="field1" value="Hello World!"><br> Field2: <input type="text" id="field2"><br><br> <button ondblclick="myFunction()">复制文字</button> <p>双击按钮时触发功能。 该函数将文本从 Field1 复制到 Field2。</p> <script> function myFunction() { document.getElementById("field2").value = document.getElementById("field1").value; } </script> </body> </html>