1.使用x-www-form-urlencoded #import dispatch_semaphore_t sema = dispatch_semaphore_create(0); NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@https://imgchr.com/json] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0]; NSDictionary *he