//url为请求链接字符串
NSArray
*cookieArray = [[NSHTTPCookieStorage
sharedHTTPCookieStorage]
cookiesForURL:[NSURL
URLWithString:url]];
for(NSHTTPCookie *cookie in cookieArray)
for(NSHTTPCookie *cookie in cookieArray)
[[NSHTTPCookieStorage
sharedHTTPCookieStorage]
deleteCookie:cookie];