eslint 的 env 配置是干嘛使的？

• 这笔修改体现了 env 和 global 的关系：

https://github.com/g8up/youDaoDict/commit/8b05616f

• 官方文档表述：

https://eslint.org/docs/user-guide/configuring

• • Environments - which environments your script is designed to run in. Each environment brings with it a certain set of predefined global variables.
  • Globals - the additional global variables your script accesses during execution.