首先,我将图像保存到文档目录
- (NSString *)saveImage {
    NSURL *url = [NSURL   URLWithString:@"http://ads.buzzcity.net/show.php?partnerid=8404&browser=app_apple"];
    NSData *data = [NSData dataWithContentsOfURL:url];
    UIImage *image = [UIImage imageWithData:data];
      //convert image into .png format.
    NSData *imageData = UIImagePNGRepresentation(image);
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:@"myImage"];
    [imageData writeToFile:fullPath atomically:YES];
    NSLog(@"image saved");
    return fullPath;
}
然后我将该路径添加到**itemFromNormalImage:fullPath**
NSString *fullPath=[self saveImage];
    btnAD = [CCMenuItemImage itemFromNormalImage:fullPath selectedImage:fullPath target:self selector:@selector(AdButtonAction)];
        NSLog(@"btnAD %@", btnAD);
    CCMenu *adMenu = [CCMenu menuWithItems:btnAD, nil];
    [self addChild:adMenu];
    adMenu.position = ccp(350 ,size.height-50);
最后在按钮操作上打开网址
-(void)AdButtonAction
{
  NSURL *url = [NSURL URLWithString:@"http://click.buzzcity.net/click.php?partnerid=8404&browser=app_apple"];
  NSLog(@"url = %@",url);
  [[UIApplication sharedApplication] openURL:url];
}