unload

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<html>
<head>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
  $(window).unload(function(){
    alert("再見！");
  });
});
</script>
</head>
<body>
<p>當(dāng)您點(diǎn)擊 <a href="http://php.cn">這個(gè)鏈接</a> 時(shí)，或者關(guān)閉窗口，會(huì)觸發(fā)一個(gè)警告框。</p>
</body>
</html>
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