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<!DOCTYPE html> <html> <body onbeforeunload="return myFunction()"> <p>重新加载此页面，或单击下面的链接以调用 onbeforeunload 事件。</p> <a href="https://www.begtut.com">点此进入begtut.com</a> <script> function myFunction() { return "在这里写点东西......"; } </script> </body> </html>