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<!DOCTYPE html> <html> <head> <script> function whichButton(event) { document.getElementById("demo").innerHTML = event.keyCode; } </script> </head> <body onkeyup="whichButton(event)"> <p><b>注意：</b>尝试此示例时，请确保正确的框架具有焦点！</p> <p>单击此页面，然后按键盘上的一个键。</p> <p id="demo"></p> </body> </html>