您可能想查看 unload 事件，请查看 Javascript：Popups

编辑：如您所说，您无法在弹出式窗口中编辑任何内容，实际上没有任何选项。我相信你当前的 setInterval 代码做的工作很好。你应该问自己，弹出关闭的实时检测是绝对关键。这500毫秒的计时器肯定不会几乎没有任何资源，或带来一些计算机的膝盖。

I'm looking for close event for popup. I've found one for XUL, but I need it for HTML.

Popup has closed property.

>>> var popup = open('http://example.com/', 'popup', 'height=400,width=500');
>>> popup.closed
false

Well, I can check it once at half second.

function open_popup() {
  var popup = open('http://example.com/', 'popup', 'height=450,width=450');
  var timer = setInterval(function(){
    if (popup.closed) {
      alert('popup closed!');
      clearInterval(timer);
    }
  }, 500);
}

I've tested it on Chrome 4.0.249.27, Opera 10.10, Safari 4.0.4, and Firefox 3.5.5. All works fine.

But setInterval bother me. It is ugly. Is there a better way of doing this?

UPDATE: I use popups for authentication dialog (oAuth, actually). I wanna send some data to parent window after popup close (through postMessage).

Page inside popup from another domain. So, I can not add any event (unload) to it due security restrictions.

I can not use iframe due to iframe buster script. So, I can not use any fancy jQuery modal dialogs.

I can not edit anything inside popup.

You might want to look into the unload event, take a look at Javascript: Popups

edit: as you've said you cannot edit anything inside the popup, there really aren't any options left. I believe your current setInterval code does the job just fine. You should ask yourself if realtime detection of the popup closing is absolutely critical. That 500 milliseconds timer certainly won't strain hardly any resources or bring someones computer to its knees.