perl 符号

( 创建简单数组
[ 创建匿名数组
{ 创建hash数组(关联数组)
$ 声明变量
@ 声明数组
% 声明hash数组(关联数组)
\ 获得指针(或引用或变量地址)
::引用其它包的变量(‘ 单引号也可以)

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