函数引用

	my %sub_of = (
    1 => sub{ print "program 1" },
        2 => sub{ print "program 2" },
        3 => sub{ print "program 3" },
        4 => sub{ print "program 4" },
        5 => sub{ print "program 5" },
        6 => sub{ print "program 6" },
        7 => sub{ print "program 7" },
        8 => sub{ print "program 8" },
        9 => sub{ print "program 9" },
);
	print "$fun is $sub_of{'1'}
";
	&{$sub_of{'1'}},

G:运维系统开发Tk>perl hash.pl
$fun is CODE(0x20ae50c)
program 1
G:运维系统开发Tk>