字典的基础操作

1. //添加现有的字典数据  
2.         [mutableDic addEntriesFromDictionary:dic3];  
3.         NSLog(@"mutableDic :%@",mutableDic);  
4.           
5.         //添加新的键值对象  
6.         [mutableDic setValue:@"set1" forKey:@"setKey1"];  
7.         NSLog(@"set value for key :%@",mutableDic);  
8.           
9.         //以新的字典数据覆盖旧的字典数据  
10.         [mutableDic setDictionary:dic2];  
11.         NSLog(@" set dictionary :%@",mutableDic);