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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> 0 = 鼠标左键<br> 1 = 鼠标中键<br> 2 = 鼠标右键 </p> <p><strong>注意：</strong>Internet Explorer 8 及更早版本返回另一个结果：</p> <p> 1 = 鼠标左键<br> 4 = 鼠标中键<br> 2 = 鼠标右键 </p></div> <script> function WhichButton(event) { alert("你按下按钮：" + event.button) } </script> </body> </html>