IOS - 字典和数组的copy使用

NSMutableDictionary *dic = [NSMutableDictionary dictionary];
	dic = [@{@"key1":@"1", @"key2":@"2"} mutableCopy];
	NSLog(@"%@, \n%@", dic, dic[@"key1"]);
	NSArray *array = @[@"dada1", @"2", @"3"];
	NSLog(@"%@, %@", array, array[0]);