perl 引用

数组的数组

$a = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]

哈希的哈希

my $student_properties_of = {
    'zdd' => {
        'age' => 30,
        'hight' => 170,
        'id' => '001',
    },

    'autumn' => {
        'age' => 27,
        'hight' => 165,
        'id' => '002',
    }
} ;