process.stdin

• <Stream>

返回连接到 stdin (fd 0) 的流。 如果 fd 0 指向文件，则返回可读流，否则返回 net.Socket（也就是 Duplex 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');
});

如果 process.stdin 返回的是 Duplex 流, 也可以在兼容 Node.js v0.10 之前版本的旧模式中使用。 详见流的兼容性。

• <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.