NSMutableString *copyMutableString = [mutableCopyString copy];

[zhangxueyang]

NSString *string = @"测试数据"; NSString *copyString = [string copy]； NSMutableString *mutableCopyString = [string mutableCopy]; NSMutableString *copyMutableString = [string copy]; NSLog(@"%p,%p,%p,%p", string, copyString, mutableCopyString, copyMutableString);

第三行改一下 严谨一点

NSString *string = @"测试数据"; NSString *copyString = [string copy]； NSMutableString *mutableCopyString = [string mutableCopy]; NSMutableString *copyMutableString = [mutableCopyString copy]; NSLog(@"%p,%p,%p,%p", string, copyString, mutableCopyString, copyMutableString);