离开页面前调用Js方法
<html xmlns="[url]http://www.w3.org/1999/xhtml[/url]"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>onbeforeunload测试</title> <script> function checkLeave(){ event.returnValue="确定离开当前页面吗?"; } </script> </head> <body onbeforeunload="checkLeave()"> </body> </html>