<perl> 数组的引用和解引用
$vs1{'$key'} = \['sd','we'];
#push @{$vs1{'$key'}},14; #Not an ARRAY reference
print @{${$vs1{'$key'}}}; # sdwe
等同于
$vs1{'$key'} = ['sd','we']; print @{$vs1{'$key'}}; # sdwe
也就是说开始的\是多余的,因为[]返回的已经是reference
这也是为什么
$vs1{'$key'} = \['sd','we']; print ${$vs1{'$key'}}; # ARRAY(0x63c7e0)