Question

我为process.stdin编写了测试代码：

console.log('User input: ');

process.stdin.setEncoding('utf8');
process.stdin.on('readable', () => {
  const chunk = process.stdin.read();
  if (chunk) {
    process.stdout.write('Print Data: ', chunk, '\n');
  }
});

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

当我输入一些文字时，请按enter，node.js给我：

buffer.js:302
      throw new TypeError('"encoding" must be a valid string encoding');
      ^

TypeError: "encoding" must be a valid string encoding
    at fromString (buffer.js:302:13)
    at Function.Buffer.from (buffer.js:173:12)
    at createWriteReq (net.js:803:45)
    at WriteStream.Socket._writeGeneric (net.js:754:11)
    at WriteStream.Socket._write (net.js:777:8)
    at doWrite (_stream_writable.js:385:12)
    at writeOrBuffer (_stream_writable.js:371:5)
    at WriteStream.Writable.write (_stream_writable.js:288:11)
    at WriteStream.Socket.write (net.js:695:40)
    at ReadStream.process.stdin.on (/Users/elsa/workspace/Training.nodejs/examples/api/process/stdin.js:7:20)

如何解决这个问题？感谢。

Answer 1

问题在于：

process.stdout.write('Print Data: ', chunk, '\n');

您需要连接字符串。这不是console.log函数，例如：

process.stdout.write('Print Data: ' + chunk + '\n');

node.js，process.stdin，抛出新的TypeError（＆＃39;＆＃34;编码＆＃34;必须是有效的字符串编码＆＃39;）;

1 个答案: