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Before js window.open, can I judge that it has been opened, and will not open it?

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 China

Post time: 2020-2-21 20:30:01
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window.open ('aa.html', 'win1', '')

This is a win1 window that I have opened.

Window.open ('aa.html', 'win1', '') again
Although it is impossible to open the second window called win1, it will flash.

Can you judge that there is a window called win1, it will not open.

Don't know how to judge.
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 China

Post time: 2020-5-2 11:45:01
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 China

Post time: 2020-5-3 23:00:02
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var newwin
if (! newwin) window.open ('aa.html', 'win1', '')
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 India

Post time: 2020-5-4 00:15:01
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Sorry. The above is wrong. .
var newwin
if (! newwin) newwin = window.open ('aa.html', 'win1', '')
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