如何判断Java中是否存在窗口? [英] How to tell if a window exists in Javascript?

问题描述

我已经看到了查看特定脚本打开的窗口是否仍处于打开状态的方法，但是如果没有打开该怎么办?

I've seen ways of seeing if a window a particular script opened is still opened, but what if it didn't?

我有一个小窗口，有一个按钮可以单击以加载大窗口.当我关闭大的那个时，我希望一个特定的 onUnload 或 onBeforeUnload 在小那个关闭时触发.如果它仍然打开，则不会执行这些过程.我可能只是脑子里放屁而已，但我不知道如何检查另一个窗口是否打开.大的没有打开它，所以我不能简单地记录打开它的手柄.

I have a small window that has a button to click to load the large window. When I close the large one, I want a particular onUnload or onBeforeUnload to fire iff the small one is closed; if it's still open, those procedures will not fire. I may be having simply a massive brain fart but I can't figure out how to check if the other window is open. The big one isn't opening it, so I can't simply record the handle from opening it.

简而言之:如果窗口A打开了窗口B，如何在窗口B中检查窗口A是否仍然存在?

In shorter terms: If window A opened window B, how can I check within window B if window A still exists?

推荐答案

if(window.opener && !window.opener.closed)
    alert('Yup, still there.');

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