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<!DOCTYPE html> <html> <body> <h1>是否按下了 Shift 键？</h1> <p>单击输入字段，然后按住 Shift 键并再次单击输入字段：</p> <input type="text" size="40" onmousedown="myFunction(event)"> <p><strong>注意：</strong> Safari 10 或 IE 8 及更早版本不支持 getModifierState() 方法。</p> <p id="demo"></p> <script> function myFunction(event) { var x = event.getModifierState("Shift"); document.getElementById("demo").innerHTML = "Pressing the shift key: " + x; } </script> </body> </html>