// NSArray * arr = @[@"1",@"2",@"3",@"4"];
// NSArray * arr1 = @[@"5",@"6",@"7"];
// NSArray * arr3 = [arr arrayByAddingObjectsFromArray:arr1];
// NSLog(@"%@",arr3);
// NSMutableArray * arr = [[NSMutableArray alloc]initWithArray:@[@"1",@"2",@"3",@"4"]];
// NSArray * arr1 = @[@"5",@"6",@"7"];
// [arr addObjectsFromArray:arr1];