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<!DOCTYPE html> <html> <body> <p>在输入字段中按下键盘上的一个键，以查看是否按下了 META 键。</p> <input type="text" onkeydown="isKeyPressed(event)"> <p id="demo"></p> <script> function isKeyPressed(event) { var x = document.getElementById("demo"); if (event.metaKey) { x.innerHTML = "META 键被按下了！"; } else { x.innerHTML = "未按下 META 键！"; } } </script> </body> </html>