var date=new Date ();
date.setTime (date.getTime ()-1000)
document.cookie= "flag=2; expires=" + date.toUTCString ();
the above code can delete the cookie. when flag=2
the problem is that the value of my flag may be 0 12, these three states,
excuse me, how to delete the cookie? of flag at this time
it deletes flag this cookie , the value is not important
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