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

wenzi123

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.

FrankZYS

With cookies

22851683

var newwin
if (! newwin) window.open ('aa.html', 'win1', '')

22851683

Sorry. The above is wrong. .
var newwin
if (! newwin) newwin = window.open ('aa.html', 'win1', '')