my $a = {}; my $b = {$a=>''};
我知道{}可用于引用哈希键,但{}在这里意味着什么？
示例代码：
use Data::Dumper; my $a = {}; print "a is " . Dumper( $a ); my %b = (); print "b is " . Dumper( \%b );
输出：
a is $VAR1 = {}; b is $VAR1 = {};
