process.stdin

• <Stream>

process.stdin 属性返回连接到 stdin (fd 0) 的流。 它是一个 net.Socket 流（也就是双工流），除非 fd 0 指向一个文件，在这种情况下它是一个可读流。

process.stdin.setEncoding('utf8');

process.stdin.on('readable', () => {
  const chunk = process.stdin.read();
  if (chunk !== null) {
    process.stdout.write(`数据: ${chunk}`);
  }
});

process.stdin.on('end', () => {
  process.stdout.write('结束');
});

作为双工流， process.stdin 也可以在“旧”模式下使用，该模式与在 v0.10 之前为 Node.js 编写的脚本兼容。 有关更多信息，参阅流的兼容性。

在“旧”的流模式下，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.

process.stdin.setEncoding('utf8');

process.stdin.on('readable', () => {
  const chunk = process.stdin.read();
  if (chunk !== null) {
    process.stdout.write(`data: ${chunk}`);
  }
});

process.stdin.on('end', () => {
  process.stdout.write('end');
});

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.