摘要： View Code /** ===== NSString ===== */NSString* string = @"hello, 1901";NSLog(@"string retainCount: %lu", [string retainCount]);// output: string retainCount: 1152921504606846975NSString* string = [[NSString alloc] initWithString:@"hello, 1901"];NSLog(@"string retai 阅读全文