类：tty.ReadStream

¥Class: tty.ReadStream

• 继承：<net.Socket>

  ¥Extends: <net.Socket>

代表终端的可读端。在正常情况下，process.stdin 将是 Node.js 进程中唯一的 tty.ReadStream 实例，应该没有理由创建额外的实例。

¥Represents the readable side of a TTY. In normal circumstances process.stdin will be the only tty.ReadStream instance in a Node.js process and there should be no reason to create additional instances.