我读过有关CFRunLoop的内容,但仍然对它有些困惑。我遇到了一段代码,我想自己澄清一下:NSMutableURLRequest*request=[[NSMutableURLRequestalloc]init];[requestsetURL:[NSURLURLWithString:[NSStringstringWithFormat:url]]];[requestsetHTTPMethod:@"POST"];[requestsetValue:@"application/xml"forHTTPHeaderField:@"Content-Type"];[requestsetValue:po