perl 列出一个目录下的文件的大小

use strict;
use warnings;
use Cwd;
my $dir = 'd:\\www';
chdir($dir);
opendir DIR, $dir or die "Cannot open dir:$!\n";
my %result;
while(my $filename = readdir(DIR)){
    next if (($filename eq '.') or ($filename eq '..'));
    if(-d $filename){$result{$filename} = "Is dir";next;}
    my $byts = -s $filename;
    $result{"$filename"} = $byts."byts";
}
while((my $key, my $value) = each %result){
    print "$key => $value\n";
}