process.stdin

• <Stream>

process.stdin 属性会返回连接到 stdin (文件描述符 0) 的流。 它是一个 net.Socket（也就是 Duplex 流），除非文件描述符 0 指向文件（在这种情况下它是一个 Readable 流）。

关于如何从 stdin 中读取，详见 readable.read()。

作为 Duplex 流， process.stdin 也可以在“旧”模式中使用，该模式与在 v0.10 之前为 Node.js 编写的脚本兼容。 详见流的兼容性。

在“旧”的流模式中，默认情况下 stdin 流是暂停的，因此必须调用 process.stdin.resume() 从中读取。 注意，调用 process.stdin.resume() 本身会将流切换为“旧”模式。

• <Stream>

The process.stdin property returns a stream connected to stdin (fd 0). It is a net.Socket (which is a Duplex stream) unless fd 0 refers to a file, in which case it is a Readable stream.

For details of how to read from stdin see readable.read().

As a Duplex stream, process.stdin can also be used in "old" mode that is compatible with scripts written for Node.js prior to v0.10. For more information see Stream compatibility.

In "old" streams mode the stdin stream is paused by default, so one must call process.stdin.resume() to read from it. Note also that calling process.stdin.resume() itself would switch stream to "old" mode.