get a stochastic integer in range
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyforks.org/scripts/430439/1074311/RandInt-Getter.js
get a stochastic integer in range
window.getRandInt(exp);
input a string exp like [|( -* \d+ , -* \d+ )|]
a stochastic integer with type number in range