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<!DOCTYPE html> <html> <body> <div onmousedown="WhichButton(event)">使用您的鼠标按钮之一单击此文本以返回一个数字。 <p>1 = 鼠标左键</p> <p>2 = 鼠标中键</p> <p>3 = 鼠标右键</p> </div> <p><strong>注意：</strong> IE8 及更早版本不支持 which 属性。</p> <script> function WhichButton(event) { alert("你按下按钮：" + event.which) } </script> </body> </html>