perl 引用实例

my $aref =[[1,2,3],[4, 5, 6],[7, 8, 9]];
foreach my $key (@{$aref})
{
    my $b=$key->[0];
    print $b,"\n";
}

1
4
7

my @difs;
my (%records,%record1,%record2);
@difs1= qw /a b c/;
@difs2= qw /d e/;
$record1{"xg3"}=\@difs1;
$record1{"xg5"}=[@difs2];
print "test value:",$record1{"xg5"}[1],"\n";
print "-----------------------------2\n";
while(($key,$value)=each %record1){
  print "$key:";
#  for(my $i=0;$i<scalar @$value;$i++){
#     print @$value," ";
#  }
my @aa=@{$value};
print @aa;
  print "\n";