开发评论功能时，需要在cookie中带有token才能发送，网络请求中添加token的方法如下：
NSDictionary *properties = [NSDictionary dictionaryWithObjectsAndKeys:
@"token",NSHTTPCookieValue, // token值
@"sso_tk", NSHTTPCookieName, // token名
@"/", NSHTTPCookiePath, // 路径
@"域名" ,NSHTTPCookieDomain, // 域
nil];
NSHTTPCookie *cookie_PD1 = [NSHTTPCookie cookieWithProperties:properties];
[[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie_PD1];
