javascript - how to make a button on a popup window that closes that popup window -

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i have made popup window button that's supposed close window. however, not work. here code:

 winpopup.document.write(<input type = "button" value = "close window" onclick = "closewindow();">)   function closewindow(){     winpopup.close();  }

winpopup doesn't have closewindow() method. use opener's.

function closewindow(){     opener.winpopup.close(); }

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