-(void)clickedButton{
//如果是从loginViewController过来到要直接回到food页
int daiIndex=self.navigationController.viewControllers.count-2;
if (daiIndex<=0) {
daiIndex=0;
}
if ([self.navigationController.viewControllers[daiIndex] isKindOfClass:NSClassFromString(@"LoginViewController")])
{
[self.navigationControllerpopToViewController:self.navigationController.viewControllers[daiIndex-1] animated:YES];
return;
}
[self.navigationControllerpopViewControllerAnimated:YES];
}