自由发挥，自由延伸，自由处理

+(NSString*)resetCountNumAndChangeformat:(NSString*)number{
    number = [self xy_ConvertNumString:number];
    NSString*divide =@",";
    NSString*integer =@"";
    NSString*radixPoint =@"";
    BOOL contains =NO;
    if([number containsString:@"."]) {
        contains =YES;
        // 若传入浮点数，则需要将小数点后的数字分离出来
        NSArray *comArray = [number componentsSeparatedByString:@"."];
        integer = [comArray firstObject];
        radixPoint = [comArray lastObject];
    }else{
        integer = number;
    }
    // 将整数按各个字符为一组拆分成数组
    if(integer.length<=6) {
        return[self xy_ConvertNumString:number];
    }
    NSMutableArray *integerArray = [[NSMutableArray alloc] init];
    for(int i =0; i < integer.length; i ++) {
        NSString*subString = [integer substringWithRange:NSMakeRange(i,1)];
        [integerArray addObject: subString];
    }
    // 将整数数组倒序每隔3个字符添加一个逗号“,”
    NSString*newNumber =@"";
    for(NSInteger i =0; i < integerArray.count; i ++) {
        NSString*getString =@"";
        NSInteger index = (integerArray.count-1) - i;
        if(integerArray.count> index) {
            getString = [integerArray objectAtIndex:index];
        }
        BOOL result =YES;
        if(index ==0&& integerArray.count%3==0) {
            result =NO;
        }
        if((i+1)%3==0&& result) {
            newNumber = [NSString stringWithFormat:@"%@%@%@",divide,getString,newNumber];
        }else{
            newNumber = [NSString stringWithFormat:@"%@%@",getString,newNumber];
        }
    }
    if(contains) {
        newNumber = [NSString stringWithFormat:@"%@.%@",newNumber,radixPoint];
    }
    return  newNumber;
}
+(NSString *)xy_ConvertNumString:(NSString *)string {
    return [NSString stringWithFormat:@"%.2f",floor([string doubleValue]*100)/100];
}