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<!DOCTYPE html> <html> <body> <p>此示例使用 addEventListener() 方法将“copy”事件附加到输入元素。</p> <input type="text" id="myInput" value="尝试复制此文本"> <script> document.getElementById("myInput").addEventListener("copy", myFunction); function myFunction() { alert("你复制了文字！"); } </script> </body> </html>