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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