blocks|key|1478699|text|window.onbeforeunload+=+function()+{
++++return+'You+have+unsaved+changes!';
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1478700|请参阅MSDN+article+on+onbeforeunload|unstyled|offset|length|1478701|在SO中也有一个similar+question|1478702|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms536907%2528VS.85%2529.aspx|1|https://stackoverflow.com/questions/276660/how-can-i-override-the-onbeforeunload-dialog-and-replace-it-with-my-own^0|0|3|U|0|0|8|G|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|V|8|@]|9|@$G|W|H|X|1|Y]]|A|$]]|$1|I|3|J|5|F|7|Z|8|@]|9|@$G|10|H|11|1|12]]|A|$]]|$1|K|3|-4|5|F|7|13|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]|S|$5|N|O|P|A|$Q|T]]]]

<pre><code>window.onbeforeunload = function() {
    return 'You have unsaved changes!';
}
</code></pre>

<p>See the <a href="http://msdn.microsoft.com/en-us/library/ms536907%28VS.85%29.aspx" rel="noreferrer">MSDN article on onbeforeunload</a></p>

<p>Also there is a <a href="https://stackoverflow.com/questions/276660/how-can-i-override-the-onbeforeunload-dialog-and-replace-it-with-my-own">similar question</a> in SO</p>


blocks|key|1264068|text|尝试：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1264069|window.onbeforeunload+=+function()+{+...your+code...+}|code-block|syntax|javascript|1264070|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Try:</p>

<pre><code>window.onbeforeunload = function() { ...your code... }
</code></pre>


blocks|key|1478664|text|根据我的经验，onunload在不同的浏览器中的工作方式是不同的。为什么不使用另一个名为onbeforeunload的事件处理程序呢？应该能行得通。Onbeforeunload将在窗口关闭之前首先执行，因此这应该可以解决您的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1478665|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

<p>From my experience onunload works differently in different browsers. Why dont you use another event handler called onbeforeunload instead. It should work. Onbeforeunload will execute first before the window closes, so that should solve your problem.</p>


blocks|key|1264260|text|这是可行的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1264261|window.onbeforeunload+=+function(){
++++console.log('closing+shared+worker+port...');
++++return+'Take+care+now,+bye-bye+then.';
++};|code-block|syntax|javascript|1264262|例如，如果您正在使用SharedWorkers，并且您需要告诉worker少了一个要管理的端口--否则，您最终可能会刷新一个浏览器选项卡，并得到类似于"Successfully+with:+10+other+tab“的内容，因为其中一个选项卡使worker保持活动状态，而另一个选项卡的刷新则不断将新的端口连接推送到您的阵列。|1264263|希望这能有所帮助。|1264264|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>This works:</p>

<pre><code>window.onbeforeunload = function(){
    console.log('closing shared worker port...');
    return 'Take care now, bye-bye then.';
  };
</code></pre>

<p>This is handy if, for instance you're working with SharedWorkers and you need to tell the worker that there is one less port to manage -- otherwise, you could end up refreshing one browser tab and get something like a "Successfully connected with: 10 other tabs" because the one tab is keeping the worker alive while the other tab's refreshes keep pushing new port connections to you array.</p>

<p>Hope this helps.</p>


blocks|key|1478934|text|出于安全原因，这是不允许的。onbeforeunload是一种浏览器API，在不同的浏览器上具有不同的行为。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1478935|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

<p>This is not allowed because of security reasons. onbeforeunload is an browser API that have different behaviors on different Browsers.</p>


blocks|key|1264175|text|这是我的答案之一，只有当用户想要关闭窗口并在某种程度上劫持浏览器消息时，才会给你onbeforeunload。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1264176|<html>
<head>
<script+src='http://code.jquery.com/jquery-1.6.2.min.js'></script>+
<script+type="text/javascript"+src="http://fbug.googlecode.com/svn/lite/branches/firebug1.4/content/firebug-lite-dev.js"></script>
<script+language='javascript'>
window.onbeforeunload+=+function(evt){
++var+message+=+"";
++var+is_chrome+=+navigator.userAgent.toLowerCase().indexOf('chrome')+>+-1;++//validating+the+browser+where+its+chrome+or+not
++if(is_chrome){
++++message+=+"Do+you+want+to+close+the+browser+or+not?";
++}
++if(this.flag+==+1+%7C%7C+$('#help').css('background-color')+==+'red'){
++++console.log("red");
++++return+message;
++}+else+{+console.log("blue");+return+NULL;}
}
function+change(){
++$('#help').css('background-color','red');
++this.flag+=+1;
}
</script>

</head>
<body>+
++<a+id='help'+onclick=change()+title="please+click+on+Links">Links</a>+
</body>
</html>|code-block|syntax|javascript|1264177|我认为它可能对任何人都有用，谢谢……|1264178|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>this is one of my answer that gives u the onbeforeunload only if the user want to close the window and also to hijack the browser message for some extent.....</p>

<pre><code>&lt;html&gt;
&lt;head&gt;
&lt;script src='http://code.jquery.com/jquery-1.6.2.min.js'&gt;&lt;/script&gt; &lt;!--this is get jquery header file its not required but i have used jquery for minor correction--&gt;
&lt;script type="text/javascript" src="http://fbug.googlecode.com/svn/lite/branches/firebug1.4/content/firebug-lite-dev.js"&gt;&lt;/script&gt;&lt;!--this will give a firebug to check the console in IE--&gt;
&lt;script language='javascript'&gt;
window.onbeforeunload = function(evt){
  var message = "";
  var is_chrome = navigator.userAgent.toLowerCase().indexOf('chrome') &gt; -1;  //validating the browser where its chrome or not
  if(is_chrome){
    message = "Do you want to close the browser or not?";
  }
  if(this.flag == 1 || $('#help').css('background-color') == 'red'){
    console.log("red");
    return message;
  } else { console.log("blue"); return NULL;}
}
function change(){
  $('#help').css('background-color','red');
  this.flag = 1;
}
&lt;/script&gt;

&lt;/head&gt;
&lt;body&gt; 
  &lt;a id='help' onclick=change() title="please click on Links"&gt;Links&lt;/a&gt; 
&lt;/body&gt;
&lt;/html&gt;
</code></pre>

<p>i think it might be useful for any body thanks.....</p>


<p>I have a query regarding my application. Whenever user closes browser window accidentally I'd want to do some clean up operations before that. I have used onunload event but problem is this event is sometimes is firing and sometimes doesn't. What should I do, is there better way to handle such type of problem.</p>


JavaScript + onbeforeunload

我有一个关于我的申请的问题。每当用户不小心关闭浏览器窗口时，我都想在此之前做一些清理操作。我使用了onunload事件，但问题是这个事件有时会触发，有时不会。我该怎么办，有没有更好的方法来处理这种类型的问题。

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