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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script src="http://libs.baidu.com/jquery/1.7.0/jquery.min.js"> </script> <script> $(document).ready(function(){ $(window).unload(function(){ alert("Goodbye!"); }); }); </script> </head> <body> <p>当你点击 <a href="http://www.w3big.com">这个链接</a>, 或者关闭窗口,alert 窗口会弹出。</p> </body> </html>