(Classic) Client cookie usage

Note the path and domain when setting cookies. Do not copy segments on the Internet.CodeEverything is fine. The path for deleting the cookie, domain, must be consistent with the setcookie settings!
Cross-subdomains under zone.com
Setcookie ("cookie_anme", cookievalue, expires, "/", ".zone.com ");
Deletecookie ('cookie _ anme ','/',' .zone.com ')

If only domain is set, it cannot be deleted normally. ie adds cookie_anme before the cookie; FF adds cookie_anme = before the cookie;
Setcookie ("cookie_anme", cookievalue, expires, "", ".zone.com ");
Deletecookie ('cookie _ anme ', '',' .zone.com ')

"/" Root path (all pages under a domain name)
Setcookie ("cookie_anme", cookievalue, expires ,"/");
Deletecookie ('cookie _ anme ','/','')

All pages under the current page
Setcookie ("cookie_anme", cookievalue, expires );
Deletecookie ('cookie _ anme ','','')