<!DOCTYPE html> <html> <body onbeforeunload="return myFunction()"> <p>请重新加载此页面,或单击下面的链接以调用 onbeforeunload 事件。</p> <a href="https://www.sou-xun.com">点击此处访问 sou-xun.com</a> <script> function myFunction() { return "Write something clever here..."; } </script> </body> </html>