NSMutableDictionary中元素替换

NSMutableDictionary *dic = [NSMutableDictionary new];

[dic addEntriesFromDictionary:@{@"key":@"12345"}];

NSLog(@"%@",dic);

[dic addEntriesFromDictionary:@{@"key":@"123"}];

NSLog(@"%@",dic);

2016-01-19 14:09:18.068 nsdic[10029:277454] {

    key = 12345;

}

2016-01-19 14:09:18.068 nsdic[10029:277454] {

    key = 123;

}