js cookies中如何将 cookies设为网站所有目录都共亨的,即不受网站中目录限制

function SetCookie(cookiename,cookievalue,cookieexpdate,domainname)
{
    document.cookie = cookiename + "=" + escape(cookievalue)
    + "; domain=" + domainname
    + "; path=" + "/"
...

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