+(NSString *)countNumAndChangeformat:(NSString *)num

{

    int count = ;

    long long int a = num.longLongValue;

    while (a != )

    {

        count++;

        a /= ;

    }

    NSMutableString *string = [NSMutableString stringWithString:num];

    NSMutableString *newstring = [NSMutableString string];

    while (count > ) {

        count -= ;

        NSRange rang = NSMakeRange(string.length - , );

        NSString *str = [string substringWithRange:rang];

        [newstring insertString:str atIndex:];

        [newstring insertString:@"," atIndex:];

        [string deleteCharactersInRange:rang];

    }

    [newstring insertString:string atIndex:];

    return newstring;

}