字面量（十五）

NSArray *a1 = @[@"a",@"b",@"c"];

//        NSMutableArray *ma1 = @[@"a",@"b",@"c"];//报了类型不匹配的警告

NSMutableArray *ma1 = @[@"a",@"b",@"c"].mutableCopy;

//使用

NSLog(@"%@",a1[0]);//2015-04-20 20:18:10.633 OCLesson6_Block[3059:187323] a

//改值

ma1[0] = @"mmm";

//字典字面量

//key：value ，key在前，冒号： value在后

NSDictionary *d1 = @{@"key1":@"a",@"key2":@"b",@"key3":@"cc"};

NSMutableDictionary *md1 = @{@"key1":@"aa",@"key2":@"bb"}.mutableCopy;

//使用

NSLog(@"%@",d1[@"key1"]);//2015-04-20 20:21:33.156 OCLesson6_Block[3076:188535] a