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<!DOCTYPE html> <html> <body onbeforeunload="return myFunction()"> <p>此示例演示如何将“onbeforeunload”事件分配给 body 元素。</p> <p>关闭此窗口，按 F5 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>