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<!DOCTYPE html> <html> <head> <script> function isKeyPressed(event) { var text = "切换键未被按下！"; if (event.shiftKey == 1) { text = "切换键被按下了！"; } document.getElementById("demo").innerHTML = text; } </script> </head> <body> <img src ="../i/eg_planets.jpg" alt="Planets" onmousedown="isKeyPressed(event)" /> <p>点击上面的图片，会提示您是否按下了 shift 键。</p> <p id="demo"></p> </body> </html>