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)
$$从指针(或引用或变量地址)得到变量
@$从指针(或引用或变量地址)得到数组
%$从指针(或引用或变量地址)得到hash数组
->从指针(或引用或变量地址)得到变量的值
::引用其它包的变量(‘ 单引号也可以)
&调用函数(在调用之后定义的函数)

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