Perl – 为什么通过键遍历哈希然后打印每个值会导致未初始化的警

#!/usr/bin/perl
use warnings;
use strict;

my %fruit = ();
%fruit = ('Apple' => 'Green','Strawberry' => 'Red','Mango' => 'Yellow');

#works
print  "An apple is $fruit{Apple} n";

#gives warnings
foreach my $key (%fruit)
{
  print "The color of $key is $fruit{$key} n";
}

#also gives warnings
foreach my $key (%fruit)
{
    my $value = $fruit{$key};
    print "$value n";
}

考虑上面的代码.我想perl看到了第一次打印和第二次打印之间的差异.但为什么？为什么在循环外检索散列值和检索循环内部的has值之间有区别？

谢谢！